Garment having polyethylene-based cooling yarns and cooling garment-regions

Abstract

A garment for a wearer includes a garment-region having two fabric-layers, which are a first fabric-layer and a second fabric-layer. The first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer. The second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer. One of the two fabric-layers is formed exclusively or dominantly of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer. The other of the two fabric-layers is formed of one or more yarns, that exclude the Cooling Yarn or that include the Cooling Yarn as a minority yarn.

Description

GARMENT HAVING POLYETHYLENE-BASED COOLING YARNS AND COOLING GARMENT-REGIONSCross-Reference to Related Applications

[0001] This patent application claims priority and benefit from US 63 / 613,417, filed on December 21, 2023, which is hereby incorporated by reference in its entirety.Field

[0002] Some embodiments are related to the field of clothing.Background

[0003] Clothing articles and clothes are typically formed of textile material and are worn on the body. Clothes are worn for various purposes, for example, to keep the human body warm in a cold weather, to protect the human body from rough surfaces or insects or plants, to provide a hygienic barrier between the human body and the environment, to protect the human body from ultraviolet radiation, to cover genitals, for social reasons or as fashion, or the like.Summary

[0004] Some embodiments provide garment having polyethylene-based cooling yarns and cooling garment-regions, as well as methods and systems for producing or manufacturing such cooling yarns and such garments.

[0005] In some embodiments, a garment or a garment-region is knitted, such as by using a circular knitting machine, from two yarns that form two fabric-layers: a first fabric-layer formed of a Cooling Yarn, and a second fabric-layer formed of another yarn (or a set of other yarns) that is not the Cooling Yarn or that does not include the Cooling Yarn.

[0006] In some embodiments, the Cooling Yarn can be, for example, a yarn formed of 100 percent of polyethylene (PE), or a yarn formed of 100 percent of High-Density Polyethylene (HDPE).

[0007] In other embodiments, the Cooling Yarn is a bi-component yarn or a dualcomponent yarn; for example, a co-extrusion output of (i) PE / HDPE with (ii) Polyamide / Nylon / Polyester / Non-Nylon Polyamide.

[0008] In other embodiments, the Cooling Yarn is a braided yarn formed of co-braided threads such as: (i) a PE / HDPE thread, co-braided with or spiraling around (ii) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide thread.

[0009] In other embodiments, the Cooling Yarn is formed of: (i) a PE / HDPE core or thread, that is coated by (ii) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide coating or shell.

[0010] In other embodiments, the Cooling Yarn is formed of: (i) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide core or thread, that is coated by (ii) a PE / HDPE coating or shell.

[0011] In some embodiments, the first fabric-layer mentioned above is an inner fabric-layer or an inwardly-facing fabric layer or body-touching fabric layer, that directly touches the body of the human wearer; whereas, the second fabric-layer mentioned above is an outer fabric-layer or an outwardly-facing fabric layer or a non-body-touching fabric layer.

[0012] In other embodiments, the second fabric-layer mentioned above is an inner fabriclayer or an inwardly-facing fabric layer or body-touching fabric layer, that directly touches the body of the human wearer; whereas, the first fabric-layer mentioned above is an outer fabriclayer or an outwardly-facing fabric layer or a non-body-touching fabric layer.

[0013] In some embodiments, the inner fabric-layer or the inwardly-facing fabric layer or body-touching fabric layer is formed exclusively of PE / HDPE; whereas, the outer fabric-layer or the outwardly-facing fabric layer or the non-body-touching fabric layer is knitted of any other non-cooling yarn(s), such as Cotton or Wool or Modal or Polyester or Nylon or Polyamide or non-Nylon Polyamide or other non-cooling yarn, or a combination or mixture or two or more of such non-cooling yarns.

[0014] In some embodiments, the outer fabric-layer or the outwardly-facing fabric layer or the non-body-touching fabric layer is formed exclusively of PE / HDPE; whereas, the inner fabric-layer or the inwardly-facing fabric layer or the body-touching fabric layer is knitted of any other non-cooling yarn(s), such as Cotton or Wool or Modal or Polyester or Nylon or Polyamide or non-Nylon Polyamide or other non-cooling yarn, or a combination or mixture or two or more of such non-cooling yarns.

[0015] In some embodiments, the fabric-layer that is formed of the Cooling Yarn, such as from Polyethylene (PE) or HDPE, has high Infrared transparency, which allows the human body to cool via thermal radiation. Instead of keeping or absorbing the thermal radiation that the human body radiates, the PE / HDEP / cooling yarn allows all, or most, of such body- radiated thermal radiation and / or body-radiated Infrared radiation to pass-through and to exit outwardly away from the human body.

[0016] Additionally or alternatively, the PE / HDEP / cooling yarn is, or can be, a hydrophobic yarn or a fast-drying yarn; such as, a yarn that was treated with, or coated with,or infused with, or formed with, or soaked in, a hydrophobic agent or a hydrophobic material or a hydrophobic solution or a hydrophobic composition; such that it also dries rapidly during or after physical exercise by the human wearer, which can further improve the convenience of the human wearer.

[0017] In some embodiments, the two fabric-layers (inner layer and outer layer) can be glued or bonded to each other, via a bonding material or gluing material or adhesive tape, or using ultrasonic connections or using seams or stitches or other connection mechanisms. In other embodiments, there is No Glue and No Adhesive and No Bonding Material between the inner fabric-layer and the outer fabric-layer, but rather, the two fabric layers are a continuous fabric that is knitted by using a circular knitting machine that is fed two different yarns (the Cooling Yarn for one fabric-layer, and the non-cooling-yarn(s) for the other fabric-layer) and that knits together the garment as a continuous dual-layer fabric such that the outer fabric-layer is knitted from one of the two yarns and the inner fabric-layer is knitted from the other of the two yarns, such that there is not need for any glue or bonding material or other adhesive between the two fabric-layers.

[0018] Some embodiments may provide other and / or additional benefits or advantages.Brief Description of the Drawings

[0019] Fig. 1 A to ID are schematic illustration of co-extrusion systems, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0020] Figs. 2A to 2D are schematic illustration of co-extrusion systems, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0021] Figs. 3 A to 3C are schematic illustration of co-extrusion systems, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0022] Fig. 3D is a schematic illustration of single-manifold co-extrusion system, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0023] Fig. 3E is a schematic illustration of multi-manifold (multiple manifold) co- extrusion system, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0024] Figs. 4A to 4C are schematic illustrations of extrusion or co-extrusion screws, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0025] Figs. 5A to 5E are schematic illustrations of various types of bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0026] Figs. 6A to 6D are schematic illustrations of various types of a triple-layer bi- component composite cooling yarn, in accordance with some demonstrative embodiments.

[0027] Figs. 7A and 7B are schematic illustrations of twisted or braided bi-component composite cooling yarns, in accordance with some demonstrative embodiments.

[0028] Figs. 8A and 8B are schematic illustration of various types of a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0029] Fig. 9A is a schematic illustration demonstrating production or co-extrusion of a bi- component composite cooling yarn, in accordance with some demonstrative embodiments.

[0030] Fig. 9B is a schematic illustration demonstrating a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.Detailed Description of Some Demonstrative Embodiments

[0031] The Applicant has realized that some clothes may cause excessive heating to the body of the person who wears them, and that such excessive heating may be undesired. The Applicant has realized that the human body radiates heat, and particular infrared (IR) radiation; and some clothes or fabrics or yarns collect or absorb or block such infrared radiation, and block it from exiting towards the environment, and cause such infrared radiation (in whole or in part) to be reflected back towards the body of the human wearer. The Applicant has realized that this is non-desired to some people; for example, a person who is exercising and who wants to reduce his body temperature and not to increase his body temperature, or people that generally suffer from excess heat, or pregnant women, or senior citizens, or other types of human wearers.

[0032] The Applicant has realized that the human body naturally radiates electromagnetic energy in the form of thermal radiation or infrared radiation. Such emission can produce the equivalent of 100 or more Watts of energy per hour, depending on the activity in which the human engages. Additionally, the human body also absorbs far infrared radiation, which is reflected by the conventional garments that the human is wearing. The far infrared energy penetrates deeply into the body tissue, and increases the body temperature.

[0033] The Applicant has realized that Polyethylene (PE) can be used as a suitable polymer for incorporation in yarns and wearable textiles, as it has high infrared transparency, which allows the human body to cool via thermal radiation.

[0034] The Applicant has realized that yarn that is formed of Polyethylene can be used to reduce such heat; because Polyethylene is transparent to infrared radiation, and does not absorb or collect or block or reflect it; but rather, Polyethylene allows the infrared radiation that the body produces to leave and exit the body and the garment towards the environment. The Applicant has also realized that Polyethylene cannot be colored or dyed, due to its chemical structure; and this causes a disadvantage because many users prefer that their clothes would be in particular color(s), or would be formed of fabric or yarns that were dyed or colored.

[0035] The Applicant has realized that this problem may be solved or mitigated, by forming or producing a bi-component yarn, which is composed of: (i) Polyethylene, and (ii) colored or dyed Polyamide or Nylon or Polyester. The two components are formed together as a single composite yarn or a single composite thread, or as two (or more) co-located filaments of a single thread or a single yarn, or as a core cylinder and a coating layer, or as two adjacent or co-located component of a single yarn or a single thread, or as two components of a co-extruded yarn, or as two braided or twisted or entangled filaments or threads of a single yarn; such that the colored or dyed Polyamide / Nylon / Polyester provides the desired color, whereas the nearby Polyamide provides the heat-reducing / infrared-transparent properties.

[0036] The Applicant has performed experiments that showed that such innovative bicomponent yarn in accordance with some embodiments of the present invention, can provide a noticeable and significantly better cooling effect and / or heat-reducing effect relative to other types of yarns or fabrics, including those formed of nylon or polyester. Furthermore, the Applicant has realized that such heat-reduction or cooling, in accordance with some embodiments of the present invention, can be achieved for a variety of types of bodily activity, and / or when the body is resting and idle and not active (e.g., sitting, sleeping), and / or when the body is active (e.g., walking, running, exercising), and / or when the body is sweating, and / or when the body is not sweating.

[0037] Some embodiments provide a garment or a clothing article that is formed of a cooling fabric or a heat-reducing fabric or a or cooling yarn or a heat-reducing yarn, or having one or more particular cooling fabric-regions or cooling garment-regions, or having one or more heat-reducing fabric -regions or heat-reducing garment-regions; or formed knitting or by utilizing one or more cooling yarns or cooling threads or heat -reducing yarns or heat-reducing threads.

[0038] In some embodiments, the cooling yarn is a bi-component or dual-component yarn or thread, or a composite yarn or a composite thread, which may also be referred to as a B Component yarn or thread; for example, formed of a combination or a co-extruded combination of both (i) Polyethylene and (ii) Polyamide or Nylon or Polyester.

[0039] In some embodiments, the cooling garment-regions or the heat-reducing garmentregions include yarn(s) and / or thread(s) that are formed of, or that contain, Polyethylene; and particularly, infrared-transparent Polyethylene that transparently enables infrared body heat to pass through and to exit the body without reflecting inwardly such bodily-generated infrared radiation back towards the body, entirely or mostly or at least partially.

[0040] Furthermore, some embodiments provide such colored cooling fabric or colored cooling yarns, or colored heat-reducing fabric or yarns or garment-regions, even though Polyethylene generally cannot by itself be dyed or colored.

[0041] For example, some embodiments may perform co-extruding both (i) Polyethylene, and (ii) a colored or dyed Polyamide or Nylon or Polyester, such that the two materials are initially stored in two separate chambers, and remain separate and non-mixed and non-blended until the moment of co-extrusion; and they are co-extruded simultaneously, with heat (e.g., from 200 to 400 degrees Celsius; or from 250 to 400 degrees Celsius; or from 250 to 350 degrees Celsius) and pressure via a single extrusion nozzle or outlet, or via two co-located extrusion nozzles or outlets; to form a single thread or a single yarn that contains Polyethylene yet is also colored or dyed due to the other co-extruded material being colored / dyed prior to the co-extrusion.

[0042] In some embodiments, the Polyethylene and the other material are co-extruded such that the single co-extruded yarn or thread is a braided yarn or a braided thread or a twisted yarn or a twisted thread, and / or such that the two materials are spiraling around each other or are formed as two helix components or two spirals that are interwound with each other or are twisting around each other.

[0043] In some embodiments, the Polyethylene and the other material are co-extruded such that the single co-extruded yarn or thread is a non-braided / untwisted yarn or a non-braided / untwisted thread, and / or such that the two materials are generally parallel to each other as two inter-connected co-extruded filaments that together form a single yarn or a single thread.

[0044] In some embodiments, the Polyethylene and the other material are extruded or are co-extruded such that single coaxial yarn or the single coaxial thread is formed, comprising: (i) an inner, core, component or elongated cylinder that is formed of colored or dyed Polyamide or Nylon or Polyester; that is surrounded by (ii) a generally concentric structure or coating thatis formed of Polyethylene or that contains Polyethylene. In some embodiments, the core cylinder of Polyamide or Nylon or Polyester is initially formed or extruded; and then, subsequently, a Polyethylene coating or surrounding layer is added or extruded around it.

[0045] In some embodiments, the Polyethylene and the other material are extruded or are co-extruded such that single coaxial yarn or the single coaxial thread is formed, comprising: (i) an inner, core, component or elongated cylinder that is formed of Polyethylene or that contains Polyethylene, or a thin and elongated Polyethylene core; that is surrounded by (ii) a generally concentric structure or coating that is formed of colored or dyed Polyamide or Nylon or Polyester. In some embodiments, the core cylinder of Polyethylene is initially formed or extruded; and then, subsequently, a Polyamide or Nylon or Polyester coating or surrounding layer is added or extruded around it.

[0046] In some embodiments, an entirety of the fabric, or the entirety of the garment is knitted from the Cooling Yarn, or by exclusively using only the Cooling Yarn and not using (not knitting, not adding) any other type of yarn.

[0047] In some embodiments, at least one particular fabric -region or fabric-layer or garment-region (e.g., a sleeve; an armpit covering region; a neckline; a breast covering region; a buttocks covering region; a knee covering region; or the like) is knitted in its entirety from the Cooling Yarn, or by exclusively using only the Cooling Yarn and not using (not knitting, not adding) any other type of yarn; whereas, one or more other fabric -regions or fabric-layers or garment-regions of the same garment, are knitted from other yarns, and / or from a blend of both Cooling Yarn(s) and other (non-cooling) yarn(s).

[0048] In some embodiments, an entirety of the fabric or an entirety of the garment is knitted from a blend of both Cooling Yarn(s) and other (non-cooling) yarn(s).

[0049] In some embodiments, the garment is formed as a two-layer garment; or, the fabric is formed as a two-layer fabric; wherein the inner layer or the body-facing layer or the bodytouching layer of the fabric or garment is formed of knitted Cooling Yarn(s), or includes Cooling Yarn(s); and wherein the outer layer of that fabric or garment (that does not directly touch the body) is formed of other yarn(s) that are not Cooling Yarn.

[0050] In some embodiments, the fabric or the garment is formed as a two-layer fabric or as a two-layer garment; wherein the inner layer or the body-facing layer or the body-touching layer of the fabric or the garment is formed of other yarn(s) that are not Cooling Yarn; and wherein the outer layer of that fabric or garment (that does not directly touch the body) is formed of knitted Cooling Yarn(s), or includes Cooling Yarn(s).

[0051] In some embodiments, the fabric or the garment is formed as a two-layer fabric or as a two-layer garment; wherein the inner layer or the body-facing layer or the body-touching layer of the fabric or the garment is formed of a blend of yarns in which C percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder N = 100 - C percent of the yarns are not cooling yarns. In some embodiments, or C is 50 percent, or C is at least 50 percent, or C is 60 percent, or C is at least 60 percent, C is 70 percent, or C is at least 70 percent, or C is 75 percent, or C is at least 75 percent, or C is 80 percent, or C is at least 80 percent, or C is 85 percent, or C is at least 85 percent, or C is 90 percent, or C is at least 90 percent, or C is 95 percent, or C is at least 95 percent, or C is 98 percent, or C is at least 98 percent. In some embodiments, C is in the range of 50 to 99; or C is in the range of 60 to 99; or C is in the range of 70 to 99; or C is in the range of 80 to 99; or C is in the range of 50 to 95; or C is in the range of 60 to 95; or C is in the range of 70 to 95; or C is in the range of 80 to 95; or C is in the range of 50 to 90; or C is in the range of 60 to 90; or C is in the range of 70 to 90; or C is in the range of 80 to 90; or C is in the range of 50 to 85; or C is in the range of 60 to 85; or C is in the range of 70 to 85; or C is in the range of 80 to 85.

[0052] In some embodiments, the fabric or the garment is formed as a two-layer fabric or as a two-layer garment; wherein the outer layer of the fabric or the garment is formed of a blend of yarns in which R percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder L = 100 - R percent of the yarns are not cooling yarns. In some embodiments, R is 50 percent, or R is at least 50 percent, or R is 60 percent, or R is at least 60 percent, or R is 70 percent, or R is at least 70 percent, or R is 75 percent, or R is at least 75 percent, or R is 80 percent, or R is at least 80 percent, or R is 85 percent, or R is at least 85 percent, or R is 90 percent, or R is at least 90 percent, or R is 95 percent, or R is at least 95 percent, or R is 98 percent, or R is at least 98 percent. In some embodiments, R is in the range of 50 to 99; or R is in the range of 60 to 99; or R is in the range of 70 to 99; or R is in the range of 80 to 99; or R is in the range of 50 to 95; or R is in the range of 60 to 95; or R is in the range of 70 to 95; or R is in the range of 80 to 95; or R is in the range of 50 to 90; or R is in the range of 60 to 90; or R is in the range of 70 to 90; or R is in the range of 80 to 90; or R is in the range of 50 to 85; or R is in the range of 60 to 85; or R is in the range of 70 to 85; or R is in the range of 80 to 85.

[0053] In some embodiments, the fabric or the garment is formed as a two-layer fabric or as a two-layer garment; wherein the outer layer of the fabric or the garment is formed of a blend of yarns in which Cl percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder N1 = 100 - Cl percent of the yarns are not cooling yarns;and also, the inner layer of the garment is formed of a blend of yarns in which C2 percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder N2 = 100 - C2 percent of the yarns are not cooling yarns.

[0054] In some embodiments, Cl is greater than C2; or Cl is at least 1.25 times C2; or Cl is at least 1.50 times C2; or Cl is at least 1.75 times C2; or Cl is at least 2 times C2; or Cl is at least 2.5 times C2; or Cl is at least 3 times C2.

[0055] In some embodiments, the fabric or the garment is formed as a two-layer fabric or as a two-layer garment; wherein the outer layer of the fabric or garment is formed of a blend of yarns in which Pl percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder Ml = 100 - Pl percent of the yarns are not cooling yarns; and also, the inner layer of the fabric or garment is formed of a blend of yarns in which P2 percent of the yarns (e.g., by weight, or by threads number) are Cooling Yarns, and wherein the remainder M2 = 100 - P2 percent of the yarns are not cooling yarns.

[0056] In other embodiments, P2 is greater than Pl; or P2 is at least 1.25 times Pl; or P2 is at least 1.50 times Pl; or P2 is at least 1.75 times Pl; or P2 is at least 2 times Pl; or P2 is at least 2.5 times Pl; or P2 is at least 3 times Pl.

[0057] In some embodiments, the above-mentioned ratios or combinations of cooling yarn(s) and non-cooling yarn(s), or the two-layer structure of the fabric or of the garment, are applied only at particular or selected fabric regions or garment regions of the garment, and not across an entirety of the garment. In some embodiments, more than two layers can be used; for example, triple-layer fabric or garment-region or garment may be formed; such as, two layers of Polyethylene or bi-component composite Cooling Yarn, that sandwich between them a central layer of color or dyed Polyamide / Nylon / Polyester; or, for example, two layers of color or dyed Polyamide / Nylon / Polyester, that sandwich between them a layer of Polyethylene or bi-component composite Cooling Yarn. Other suitable arrangements of layers may be used.

[0058] In some embodiments, an inner layer of the fabric (or garment) is formed of Polyamide / Nylon / Polyester and does not include any Polyethylene or bi-component composite Cooling Yarn; whereas an outer layer of the fabric (or garment) is formed of Polyethylene or bi-component composite Cooling Yarn (or, contains such Polyethylene or bi- component composite Cooling Yarn that is optionally blended with Polyamide / Nylon / Polyester); such that the inner layer collects and transports sweat from the body outwardly, towards the outer layer which may have hydrophobic properties and thus assists in rapid cooling of the body and / or rapid evaporation of the sweat and / or rapid drying of the fabric / garment. Such dual-layer structure of the fabric / garment may particularly be advantageous for people engaging in physical activity or physical exercise, and / or people that are sweating with or without such physical activity.

[0059] In other embodiments, an outer layer of the fabric (or garment) is formed of Polyamide / Nylon / Polyester and does not include any Polyethylene or bi-component composite Cooling Yarn; whereas an inner layer of the fabric (or garment) is formed of Polyethylene or bi-component composite Cooling Yarn (or, contains such Polyethylene or bicomponent composite Cooling Yarn that is optionally blended with Polyamide / Nylon / Polyester).

[0060] In some embodiments, the Polyethylene or bi-component composite Cooling Yarn is non-colored / non-dyed, or is raw white. In other embodiments, the Polyethylene or bi- component composite Cooling Yarn is dope dyed or solution-dyed, such as, by adding color pigments into the melted plastic materials or by otherwise trapping or injecting or infusing colored pigments into the material in its semi-liquid stage, or by adding dye to the raw polymeric material from which the yarn is extruded or co-extruded.

[0061] In some embodiments, the Cooling Yarn is a composite single yarn which comprises polyethylene and polyamide (or nylon, or polyester). The two different and separate materials are not blended and are not mixed prior to extrusion; rather, they are co-extruded (the system feeds each one into a separate compartment of an extruder device, so that they are pushed out separately from two respective side by side nozzles, with heating, or from a single common extrusion outlet yet still without pre-blending / pre-mixing), to thus provide two threads or two filaments side by side, which then stick together during the cooling-down stage of the production process. The two components are not mixed together in a single vessel or in a single chamber or compartment prior to extrusion.

[0062] In some embodiments, the bi-component composite co-extruded cooling yarn comprises post-extrusion, or the bi-component composite co-extruded cooling yarn comprises at the moment of co-extrusion, or the bi-component coaxial yarn comprises, or the bi- component braided yarn comprises:! percent (by weight) of Polyethylene, and 99 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, up to 1 percent (by weight) of Polyethylene, and at least 99 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 1.25 percent (by weight) of Polyethylene, and at most 98.75 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 1.50 percent (by weight) of Polyethylene, and at most 98.50 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 1.75 percent (by weight) of Polyethylene, and at most 98.25percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; at least 2 percent (by weight) of Polyethylene, and at most 98 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 2.50 percent (by weight) of Polyethylene, and at most 97.50 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 3 percent (by weight) of Polyethylene, and at most 97 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 4 percent (by weight) of Polyethylene, and at most 96 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 5 percent (by weight) of Polyethylene, and at most 95 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 7 percent (by weight) of Polyethylene, and at most 93 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 10 percent (by weight) of Polyethylene, and at most 90 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 15 percent (by weight) of Polyethylene, and at most 85 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 20 percent (by weight) of Polyethylene, and at most 80 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 25 percent (by weight) of Polyethylene, and at most 75 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 30 percent (by weight) of Polyethylene, and at most 70 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 33.3 percent (by weight) of Polyethylene, and at most 66.7 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 40 percent (by weight) of Polyethylene, and at most 60 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, 50 percent (by weight) of Polyethylene, and 50 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 50 percent (by weight) of Polyethylene, and at most 50 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 60 percent (by weight) of Polyethylene, and at most 40 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 66.7 percent (by weight) of Polyethylene, and at most 33.3 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 70 percent (by weight) of Polyethylene, and at most 30 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 75 percent (by weight) of Polyethylene, and at most 25 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 80 percent (by weight) of Polyethylene, and at most 20 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 90 percent (by weight) of Polyethylene, and at most 10 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 95 percent (by weight) of Polyethylene, and at most 5 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 98 percent (byweight) of Polyethylene, and at most 2 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester; or, at least 99 percent (by weight) of Polyethylene, and at most 1 percent (by weight) of colored or dyed Polyamide or Nylon or Polyester.

[0063] In some embodiments, the fabric or fabric-region or garment or a particular garment region has a knitted structure of alternating yarns, as follows: a bi-component composite cooling yarn, knitted next to a different type of yarn (that is not bi-component composite cooling yarn), that in turn is knitted next to another bi-component composite cooling yarn, that in turn is knitted next to that different type of yarn (that is not bi-component composite cooling yarn), and so forth in an alternating structure. For example, C indicates a cooling yarn; and N indicates the other yarn (the non-cooling yarn); a possible alternating knitting structure can be: CNCN, or CCNCCN, or CNNCNN, or CCCNCCCN, or NNNCNNNC, or CCCNNCCCNN, or NNNCCNNNCC, or CNCCNN, or NCNNCC, or other suitable alternating pattern; to provide a Heathered coloring effect or a Gradient coloring effect or a Melange coloring effect. Other suitable patterns may be used. In some embodiments, the cooling yarn and the noncooling yarn may be fed into a seamless / circular / tubular / other type of knitting machine, via a feeding controller that selectively provides either the cooling yarn or the non-cooling yarn to each particular needle or feeder, to achieve the particular knitted structure.

[0064] In some embodiments, the garment may be, for example: a shirt, a long sleeve shirt, a short sleeve shirt, a T-shirt, an athletic shirt, a dress, a skirt, underwear, bra, sports bra, pants, leggings, tights, short pants, long pants, socks, sportswear, activewear, sleepwear, pajamas, a seam-less or seam-free garment, or the like. In other embodiments, the entirety of the garment if formed exclusively of the cooling yarn, or of the blended mixture of cooling yarn and noncooling yarn. In other embodiments, only one or more particular garment-region(s) of the garment are formed exclusively of the cooling yarn, or of the blended mixture of cooling yarn and non-cooling yarn.

[0065] In other embodiments, only an inner layer of the fabric or the garment, or an inner layer of a particular fabric -region or garment-region, are formed exclusively of the cooling yarn, or of the blended mixture of cooling yarn and non-cooling yarn. In other embodiments, only an outer layer of the fabric or the garment, or an outer layer of a particular fabric -region or garment-region, are formed exclusively of the cooling yarn, or of the blended mixture of cooling yarn and non-cooling yarn. In other embodiments, both an inner layer of the fabric / garment and an outer layer of the fabric / garment (or: both an inner layer of a particular fabricregion / garment -region and an outer layer of that particular fabric -region / garment-region) areformed exclusively of the cooling yarn, or of the blended mixture of cooling yarn and noncooling yarn.

[0066] In some embodiments, the non-cooling-yarn may exclude any Polyethylene; and / or may be formed of Polyester, or cotton, or may be other suitable non-cooling yarn.

[0067] In some embodiments, the raw Polyethylene that is used for producing cooling yarn is one type of polyethylene fiber from the group consisting of: VLDPE, LDPE, LLDPE, MDPE, HDPE, XLPE, and UHMWPE. In other embodiments, the raw Polyethylene that is used for producing cooling yarn is a mixture of two types of polyethylene fiber from the group consisting of: VLDPE, LDPE, LLDPE, MDPE, HDPE, XLPE, and UHMWPE. In other embodiments, the raw Polyethylene that is used for producing cooling yarn is a mixture of three or more types of polyethylene fiber from the group consisting of: VLDPE, LDPE, LLDPE, MDPE, HDPE, XLPE, and UHMWPE. For example, very-low-density polyethylene (VLDPE) has a density range of 0.880 to 0.915 g / cm3, and is a linear polymer with short-chain branches. For example, low-density polyethylene (LDPE) has a density range of 0.910 to 0.940 g / cm3, and is created by free-radical polymerization with a high degree of short-chain and long-chain branching. For example, linear low-density polyethylene (LLDPE) has a density range of 0.915 to 0.925 g / cm3; and is a linear polymer with short-chain branches but a higher tensile strength than LDPE. For example, medium-density polyethylene (MDPE) has a density range of 0.926 to 0.940 g / cm3. For example, cross-linked polyethylene (PEX or XLPE) has a medium to high density; and its polymer structure contains cross-link bonds changing the thermoplastic into a thermoset for better high-temperature properties. For example, high-density polyethylene (HDPE) has a density of at least 0.941 g / cm3; it is a linear polymer with a low degree of branching and high tensile strength. For example, ultra-high-molecular-weight polyethylene (UHMWPE) has a molecular weight between 3.5 and 7.5 million Atomic Mass Units. Other types of polyethylene may be used.

[0068] In some embodiments, raw or pre-extrusion polyethylene is provided as a solution or in a gel state, to maintain existing polymeric chains.

[0069] In some embodiments, optionally, a triple extrusion system may be used to produce the composite cooling yarn. For example, a first chamber stores the Polyethylene; a second chamber stores the colored or dyed Polyamide / Nylon / Polyester; and a third chamber, located between them, stores an adhesive or glue or bonding agent, to improve the bonding or attachment of the two components.

[0070] In another example, triple extrusion can be used to produce the composite cooling yarn as follows: a first chamber stores Polyethylene; a second chamber stores colored or dyedPolyamide / Nylon / Polyester; and a third chamber stores Polyethylene; to thus produce via extrusion a core of colored or dyed Polyamide / Nylon / Polyester that is surrounded or sandwiched by Polyethylene.

[0071] In another example, triple extrusion can be used to produce the composite cooling yarn as follows: a first chamber stores colored or dyed Polyamide / Nylon / Polyester; a second chamber stores Polyethylene; and a third chamber stores colored or dyed Polyamide / Nylon / Polyester; to thus produce via extrusion a core of Polyethylene that is surrounded or sandwiched by the colored or dyed Polyamide / Nylon / Polyester.

[0072] In some embodiments, a single manifold extrusion system may be used. In other embodiments, a multiple manifold extrusion system may be used. Optionally, a combining adapter may be used for combining materials during the extrusion process and / or within the extruder system.

[0073] In some embodiments, a multi-cavity die may be used for the extrusion or coextrusion process, to facilitate the production of a composite yarn or a dual-layer yarn. In other embodiments, a feed black can be used to combine multiple extruders with a single-cavity die, or in conjunction with one of the cavities of a multi-cavity die.

[0074] In some embodiments, the co-extruded yarn or thread is also spun, to enable formation of long or elongated filaments, which in turn facilitate the production of an elongated yarn.

[0075] In some embodiments, the cooling yarn may be knitted; in other embodiments, it may be used for other garment production methods, for example, stitching, sewing, weaving, or the like.

[0076] Reference is made to Fig. 1A, which is a schematic illustration of a co-extrusion system 101, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a dual extrusion mechanism of (i) Polyethylene in parallel with (ii) Polyamide / Nylon / Polyester. For example, a first chamber stores Polyethylene, which is pushed via a first channel within the die; a second chamber stores Polyamide / Nylon / Polyester, which is pushed via a second channel within the die; the two pushed materials meet within the die and are extruded out as a single, co-extruded, yarn or thread.

[0077] Reference is made to Fig. IB, which is a schematic illustration of another coextrusion system 102, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusion mechanism: a first chamber stores Polyethylene, which is pushed via a first side channel withinthe die; a second chamber stores Polyamide / Nylon / Polyester, which is pushed via a second, central, channel within the die; a third chamber also stores Polyethylene, which is pushed via a third side channel within the die; the three pushed materials meet within the die and are extruded out as a single, co-extruded, yarn or thread.

[0078] Reference is made to Fig. 1C, which is a schematic illustration of another coextrusion system 103, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusion mechanism: a first chamber stores Polyamide / Nylon / Polyester, which is pushed via a first side channel within the die; a second chamber stores Polyethylene, which is pushed via a second, central, channel within the die; a third chamber also stores Polyamide / Nylon / Polyester, which is pushed via a third side channel within the die; the three pushed materials meet within the die and are extruded out as a single, co-extruded, yarn or thread.

[0079] Reference is made to Fig. ID, which is a schematic illustration of another coextrusion system 104, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusion mechanism: a first chamber stores Polyethylene, which is pushed via a first side channel within the die; a second chamber stores Polyamide / Nylon / Polyester, which is pushed via a second side channel within the die; a third chamber stores a bonding agent or adhesive or a binding agent (to improve or accelerate bonding or binding), which is pushed via a third side channel or a third central channel within the die; the three pushed materials meet within the die and are extruded out as a single, co-extruded, yarn or thread.

[0080] Reference is made to Fig. 2A, which is a schematic illustration of a co-extrusion system 201, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a dual extrusion mechanism of (i) Polyethylene in parallel with (ii) Polyamide / Nylon / Polyester. For example, a first chamber stores Polyethylene, which is pushed via a first channel externally to the die; a second chamber stores Polyamide / Nylon / Polyester, which is pushed via a second channel externally to the die; the two pushed materials meet externally to the die, where they may slightly blend momentarily or may not even blend at all, and they are immediately pushed into the die and extruded through it as a single, co-extruded, yarn or thread. Also shown is a third chamber that is optional and remains unused in this implementation.

[0081] Reference is made to Fig. 2B, which is a schematic illustration of a co-extrusion system 202, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusionmechanism: a first chamber stores Polyethylene, which is pushed via a first side channel externally to the die; a second chamber stores Polyamide / Nylon / Polyester, which is pushed via a second, central, channel externally to the die; a third chamber also stores Polyethylene, which is pushed via a third side channel externally to the die; the three pushed materials meet externally to the die, where they may slightly blend momentarily or may not even blend at all, and they are immediately pushed into the die and extruded through it as a single, co-extruded, yarn or thread.

[0082] Reference is made to Fig. 2C, which is a schematic illustration of a co-extrusion system 203, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusion mechanism: a first chamber stores Polyamide / Nylon / Polyester, which is pushed via a first side channel externally to the die; a second chamber stores Polyethylene, which is pushed via a second, central, channel externally to the die; a third chamber also stores Polyamide / Nylon / Polyester, which is pushed via a third side channel externally to the die; the three pushed materials meet externally to the die, where they may slightly blend momentarily or may not even blend at all, and they are immediately pushed into the die and extruded through it as a single, co-extruded, yarn or thread.

[0083] Reference is made to Fig. 2D, which is a schematic illustration of a co-extrusion system 204, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple extrusion mechanism: a first chamber stores Polyamide / Nylon / Polyester, which is pushed via a first side channel externally to the die; a second chamber stores Polyethylene, which is pushed via a second side channel externally to the die; a third chamber stores adhesive or glue or bonding agent or binding agent, to improve the bonding or attachment of the two components. The three pushed materials meet externally to the die, where they may slightly blend momentarily or may not even blend at all, and they are immediately pushed into the die and extruded through it as a single, co-extruded, yarn or thread.

[0084] Reference is made to Fig. 3A, which is a schematic illustration of a multi-manifold co-extrusion system 310, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple co- extrusion mechanism: a first chamber 311, a second chamber 312, and a third chamber 313. In some embodiments, chamber 311 stores Polyethylene, and chamber 313 stores Polyamide / Nylon / Polyester, and chamber 312 remains unused. In other embodiments, chamber 311 stores Polyethylene, and chamber 313 stores Polyamide / Nylon / Polyester, and chamber 312stores adhesive or glue or bonding agent or binding agent. In other embodiments, chamber 311 stores Polyethylene, and chamber 312 stores Polyamide / Nylon / Polyester, and chamber 313 stores Polyethylene. In other embodiments, chamber 311 stores Polyamide / Nylon / Polyester, and chamber 312 stores Polyethylene, and chamber 313 stores Polyamide / Nylon / Polyester. In other embodiments, chamber 311 stores Polyamide, and chamber 312 stores Polyethylene, and chamber 313 stores Polyester. In other embodiments, chamber 311 stores Polyamide, and chamber 312 stores Polyethylene, and chamber 313 stores Polyamide. In other embodiments, chamber 311 stores Nylon, and chamber 312 stores Polyethylene, and chamber 313 stores Nylon. In other embodiments, chamber 311 stores Polyamide / Nylon, and chamber 312 stores Polyethylene, and chamber 313 stores Polyester. In other embodiments, chamber 311 stores Nylon, and chamber 312 stores Polyethylene, and chamber 313 stores Polyester. In other embodiments, chamber 311 stores Polyamide, and chamber 312 stores Polyethylene, and chamber 313 stores Polyester. In other embodiments, chamber 311 stores Polyamide, and chamber 312 stores Polyethylene, and chamber 313 stores Nylon. In some embodiments, a triple-component composite yarn may be co-extruded using such three chambers and three nonidentical materials. Other suitable combinations or compositions may be co-extruded or used.

[0085] Reference is made to Fig. 3B, which is a schematic illustration of another coextrusion system 320, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple co-extrusion mechanism: a first chamber 321, a second chamber 322, a third chamber 323, and a coextrusion channel 324.

[0086] Reference is made to Fig. 3C, which is a schematic illustration of another coextrusion system 330, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. It demonstrates a triple co-extrusion mechanism: a first chamber 331, a second chamber 331, a third chamber 333, a feed block, and a co-extrusion channel.

[0087] Reference is made to Fig. 3D, which is a schematic illustration of single-manifold co-extrusion system 340, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. For example, one chamber stores Polyethylene; whereas the other chamber stores Polyamide / Nylon / Polyester.

[0088] Reference is made to Fig. 3E, which is a schematic illustration of multi-manifold (multiple manifold) co-extrusion system 350, which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments. For example,one chamber stores Polyethylene; whereas the other chamber stores Polyamide / Nylon / Polyester.

[0089] Reference is made to Figs. 4A to 4C, which are schematic illustrations of extrusion or co-extrusion screws 401-403 (respectively), which can be used to produce a bi-component composite cooling yarn, in accordance with some demonstrative embodiments.

[0090] Fig. 4A demonstrates three zones of an extrusion screw 401: a feed section having a first constant depth (or height); a transition section or a compression section, having variable depth (or height); and a metering section having second constant depth (or height) that is smaller than the first constant depth (or height).

[0091] Fig. 4B demonstrates an extrusion screw 402 that is configured for pushing and extruding the Polyethylene; whereas, Fig. 4C demonstrates an extrusion screw 403 that is configured for pushing and extruding the Polyamide / Nylon / Polyester. For example, the compression section (transition section) of the screw for pushing and extruding the Polyethylene, is 1.5 or 2.0 or 2.5 or 3 times longer than the compression section (transition section) of the screw for pushing and extruding the Polyamide / Nylon / Polyester; or, the compression section (transition section) of the screw for pushing and extruding the Polyethylene, is longer by a factor that is in a range of 1.5 to 3 than the compression section (transition section) of the screw for pushing and extruding the Polyamide / Nylon / Polyester.

[0092] Reference is made to Fig. 5A, which is a schematic illustration of a bi-component composite cooling yarn 501, in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread.

[0093] Reference is made to Fig. 5B, which is a schematic illustration of a bi-component composite cooling yarn 502, in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread. It demonstrates that the two materials are partially penetrating into each other; they are not interconnected via a linear surface, but rather, portions of the Polyamide / Nylon / Polyester penetrate slightly into the adjacent Polyethylene, and portions of the Polyethylene penetrate slightly into the Polyamide / Nylon / Polyester; such that the two materials have a non-linear, wave-like contact region.

[0094] Reference is made to Fig. 5C, which is a schematic illustration of a bi-component composite cooling yarn 503, in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread. A thicker central line indicates that optionally, an adhesive or glue orbonding agent or binding agent may be part of the composite yarn, to improve the binding or the bonding of the two adjacent materials.

[0095] Reference is made to Fig. 5D, which is a schematic illustration of a bi-component composite cooling yarn 504, in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread. In some embodiments, the weight or the volume of the Polyamide / Nylon / Polyester in the composite yarn, is N times (or, at least N times) the weight or the volume of the Polyethylene in that composite yarn; wherein N is greater than one. For example, N can be 1.25; or N can be 1.50; or N can be 1.75; or N can be 2; or N can be 2.50; or N can be 3; or N can be 4; or N can be 5; or N can be at least 1.25; or N can be at least 1.50; or N can be at least 1.75; or N can be at least 2; or N can be at least 2.50; or N can be at least 3; or N can be at least 4; or N can be at least 5; or N can be in a range of 1.25 to 3; or N can be in a range of 1.25 to 3; or N can be in a range of 1.5 to 5; or N can be in a range of 2 to 5.

[0096] Reference is made to Fig. 5E, which is a schematic illustration of a bi-component composite cooling yarn 505, in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread. In some embodiments, the weight or the volume of the Polyethylene in the composite yarn, is M times (or, at least M times) the weight or the volume of the Polyamide / Nylon / Polyester in that composite yarn; wherein M is greater than one. For example, M can be 1.25; or M can be 1.50; or M can be 1.75; or M can be 2; or M can be 2.50; or M can be 3; or M can be 4; or M can be 5; or M can be at least 1.25; or M can be at least 1.50; or M can be at least 1.75; or M can be at least 2; or M can be at least 2.50; or M can be at least 3; or M can be at least 4; or M can be at least 5; or M can be in a range of 1.25 to 3; or M can be in a range of 1.25 to 3; or M can be in a range of 1.5 to 5; or M can be in a range of 2 to 5.

[0097] Reference is made to Fig. 6A and Fig. 6B, which are schematic illustrations of a triple-layer bi-component composite cooling yarn (601 or 602), in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread, having three layers in total. For example, a first region of Polyethylene and a second region of Polyethylene sandwich between them, or surround or cover or encapsulate or trap therein, a central region of Polyamide / Nylon / Polyester. Fig. 6B demonstrates that the two materials are partially penetrating into each other; they are not interconnected via a linear surface, but rather, portions of the Polyamide / Nylon / Polyester penetrate slightly as small protrusions into the adjacent Polyethylene, and portions of the Polyethylene penetrate slightly as small protrusions into thePolyamide / Nylon / Polyester; such that the two materials have a non-linear, wave-like contact region.

[0098] Reference is made to Fig. 6C and Fig. 6D, which are schematic illustrations of a triple-layer bi-component composite cooling yarn (603 or 604), in accordance with some demonstrative embodiments. It is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread, having three layers in total. For example, a first region of Polyamide / Nylon / Polyester and a second region of Polyamide / Nylon / Polyester sandwich between them, or surround or cover or encapsulate or trap therein, a central region of Polyethylene. Fig. 6D demonstrates that the two materials are partially penetrating into each other; they are not interconnected via a linear surface, but rather, portions of the Polyamide / Nylon / Polyester penetrate slightly as small protrusions into the adjacent Polyethylene, and portions of the Polyethylene penetrate slightly as small protrusions into the Polyamide / Nylon / Polyester; such that the two materials have a non-linear, wave-like contact region.

[0099] Reference is made to Fig. 7A and Fig. 7B, which are schematic illustrations of twisted or braided bi-component composite cooling yarns (701 or 702), in accordance with some demonstrative embodiments. Each of these cooling yarns is composed of Polyethylene that was co-extruded with Polyamide / Nylon / Polyester, as a single yarn or a single thread, while the extruded outlet was also rotating or spinning or spiraling; to generate a twisted or braided yarn or thread. Fig. 7 A demonstrates an S twist braided bi-component composite cooling yarn 701; whereas Fig. 7B demonstrates a Z twist braided bi-component composite cooling yarn 702. It is noted that in accordance with some embodiments, the cooling yarns shown in Fig. 7A and Fig. 7B are not merely two discrete and separate and already-produced yarns that were later twisted or braided around each other; but rather, the two components (the Polyethylene, and the Polyamide / Nylon / Polyester) are chemically twisted or chemically braided around each other via a single co-extrusion process and structure. The two materials are partially penetrating into each other; they are not interconnected via a smooth or discrete or detachable surface, but rather, portions of the Polyamide / Nylon / Polyester penetrate slightly into the adjacent Polyethylene, and portions of the Polyethylene penetrate slightly into the Polyamide / Nylon / Polyester; such that the two materials have a non-linear, wave-like contact region. The two materials cannot be detached from each other; and the twisted / braided cooling yarn cannot be “separated” or “unraveled” or detached into two separate yarns, as the two materials were chemically bonded to each other in the co-extrusion process.

[0100] Reference is made to Fig. 8A, which is a schematic illustration of a bi-component composite cooling yarn 801, in accordance with some demonstrative embodiments. It is composed of a colored or dyed Polyamide / Nylon / Polyester core (e.g., an elongated cylindrical core), that is non-detachably coated or surrounded by (or chemically bonded to) Polyethylene, as a single coaxial yarn.

[0101] Reference is made to Fig. 8B, which is a schematic illustration of a bi-component composite cooling yarn 802, in accordance with some demonstrative embodiments. It is composed of a Polyethylene core (e.g., an elongated cylindrical core), that is non-detachably coated or surrounded by (or chemically bonded to) Polyamide / Nylon / Polyester, as a single coaxial yarn.

[0102] Referring to Fig. 8A and to Fig. 8B, the radius of the central / core / inner cylinder can be denoted as Rzn; and the radius of the outer / external layer can be denoted as Rout. In some embodiments, Rout is 1.25 times Rii , or Rout is 1.5 times Rii , or Rout is 2 times Rii , or Rout is 2.5 times Rii , or Rout is 3 times Riir, or Rout is 4 times Rin; or Rout is 5 times Riir, or Rout is at least 1.25 times Riir, or Rout is at least 1.5 times Rin; or Rout is at least 2 times Rin; or Rout is at least 2.5 times Rin; or Rout is at least 3 times Riir, or Rout is at least 4 times Rin; or Rout is at least 5 times Riir, or Rout divided by Rin is in a range of 1.25 to 5 ; or Rout divided by Rin is in a range of 1.5 to 5; or Rout divided by Rin is in a range of 2 to 5; or Rout divided by Rin is in a range of 1.5 to 4; or Rout divided by Rin is in a range of 1.5 to 3. Other suitable ratios may be used.

[0103] Reference is made to Fig. 9A, which is a schematic illustration demonstrating production or co-extrusion of a bi-component composite cooling yarn 910, in accordance with some demonstrative embodiments. For example, a Polyethylene masterbatch and a separate Polyamide / Nylon / Polyester masterbatch may be co-extruded to form a single yarn or a single thread, which enjoys the benefits and advantages of its Polyethylene component (e.g., transparency to infrared radiation; hydrophobic properties) and its Polyamide / Nylon / Polyester component (e.g., absorbing sweat and transporting it outwardly or away from the human body; capability to be colored or dyed in a post-production / post-knitting / postweaving / water-based dyeing process or coloring process).

[0104] Reference is made to Fig. 9B, which is a schematic illustration demonstrating a bi- component composite cooling yarn 920 (optionally being a co-extruded composite yarn), in accordance with some demonstrative embodiments. For example, a Polyethylene component and a Polyamide / Nylon / Polyester component are integrally and non-detachably attached to each other, forming a singular yarn or a singular thread. For demonstrative purposes, thePolyethylene component and a Polyamide / Nylon / Polyester component are shown as generally having similar or identical size or volume; however, this is only a non-limiting example. In some embodiments, the Polyethylene has N times the volume and / or the mass and / or the weight of the Polyamide / Nylon / Polyester component (e.g., when measured along a unit-of-length, such as along one meter of the yarn); wherein N is, for example, 1.25 or 1.50 or 1.75 or 2.0 or 2.5 or 3, or wherein N is at least 1.25 or at least 1.5 or at least 1.75 or at least 2 or at least 2.5 or at least 3. In other embodiments, the Polyamide / Nylon / Polyester component has M times the volume and / or the mass and / or the weight of the Polyethylene (e.g., when measured along a unit-of-length, such as along one meter of the yarn); wherein M is, for example, 1.25 or 1.50 or 1.75 or 2.0 or 2.5 or 3, or wherein M is at least 1.25 or at least 1.5 or at least 1.75 or at least 2 or at least 2.5 or at least 3. Other suitable ratios may be used.

[0105] In some embodiments, the Polyethylene utilized for producing the composite cooling yarn is Metallocene Polyethylene, or is accompanied by (or produced with) a metallocene catalyst; or is accompanied by (or produced with) a Ziegler-Natta catalyst; or is accompanied by (or produced with) one or more free radical initiators, or having a narrow molecular weight distribution function or graph (e.g., narrower than a pre-defined threshold value). In other embodiments, the Polyethylene utilized for producing the composite cooling yarn is Non-Metallocene Polyethylene; or is not accompanied by (and / or is not produced with) any catalyst, or any metallocene catalyst, or any Ziegler-Natta catalyst, or any free radical initiators; and / or has a wide molecular weight distribution function or graph (e.g., wider than a pre-defined threshold value).

[0106] Some embodiments provide an innovative cooling yarn and garments incorporating such yarn, designed to enhance heat dissipation and wearer comfort through advanced material engineering and co-extrusion techniques. This cooling yarn is primarily formed from a bicomponent structure comprising Polyethylene and Polyamide, Nylon, or Polyester. The invention addresses the limitations of conventional fabrics that retain and reflect infrared radiation emitted by the human body, leading to excessive heat buildup and discomfort. By leveraging the high infrared transparency of Polyethylene, the cooling yarn enables bodygenerated infrared radiation to pass through the material and dissipate into the environment, thereby reducing body temperature. The Polyethylene component is co-extruded with Polyamide, Nylon, or Polyester, which allows for the addition of color or dye properties to the yarn, overcoming the natural inability of Polyethylene to retain color. The co-extrusion process chemically bonds the two components, creating an inseparable composite structure that cannotbe mechanically unraveled, ensuring durability and enhanced performance compared to conventional mechanically braided or twisted yarns.

[0107] Some embodiments further enable various structural configurations of the yarn, including coaxial arrangements where one component forms the core and the other acts as a coating, braided or twisted designs where the materials are intertwined, and multi-layered structures that can optimize both thermal and aesthetic properties. Ratios between the components are precisely controlled, with configurations such as Polyethylene forming 50% to 90% of the yarn by weight or the coating layer being 1.25 to 5 times the thickness of the core. These ratios ensure a balance between cooling efficiency and the structural and aesthetic requirements of the fabric. The yarn can be further customized with additives or surface treatments to enhance properties such as hydrophobicity, tensile strength, or dye adherence. The innovative design makes it suitable for various garment applications, including athletic wear, sleepwear, and casual clothing, where heat management and comfort are paramount.

[0108] In addition to the cooling yarn itself, some embodiments provide garments incorporating the cooling yarn. Garments can be entirely formed from the cooling yarn or include specific garment-regions knitted or blended with other yarns. For instance, regions such as armpits, necklines, or back panels can exclusively feature the cooling yarn to provide localized heat reduction, while other areas may include a blend of cooling and non-cooling yarns for structural or aesthetic reasons. Some embodiments further include garments with multi-layer configurations, where the inner layer, made from cooling yarn, directly contacts the body to wick sweat and promote cooling, while the outer layer, made from other yarns, enhances structural integrity and appearance. Alternatively, the outer layer can include cooling yarn to maximize heat dissipation while the inner layer wicks sweat outward. Seamless knitting and extrusion technologies are utilized to integrate cooling and non-cooling yarns into complex patterns or gradients, allowing for enhanced thermal management and aesthetic appeal.

[0109] Some embodiments may address or mitigate a range of problems associated with traditional textiles, including poor heat dissipation, inefficient sweat management, and the limited functionality of conventional fabrics in managing body temperature during activities or in warm environments. Sensitive populations, such as seniors, pregnant women, or individuals prone to overheating, benefit significantly from the cooling properties of the yarn. Furthermore, the incorporation of hydrophobic Polyethylene enhances sweat evaporation and garment drying times, making it ideal for athletic and activewear. The invention also reduces reliance on artificial cooling systems, such as air conditioning, by providing garments that inherently keep wearers cooler, contributing to energy savings and environmental sustainability.

[0110] From a production perspective, the co-extrusion process introduces unique efficiencies and functional benefits. By chemically bonding the components during extrusion, the process eliminates the need for post-production assembly or mechanical binding, reducing manufacturing complexity and enhancing product durability. Co-extrusion also allows for precise control over material ratios, enabling tailored yarn configurations for specific applications. Additionally, the invention leverages a variety of extrusion systems, including dual and triple extrusion setups, to create composite yarns with complex structures, such as multi-layered or helical arrangements. These systems ensure the seamless integration of Polyethylene and Polyamide, Nylon, or Polyester, resulting in yarns with superior thermal, mechanical, and aesthetic properties.

[0111] In some embodiments, the cooling yarn can also be used in innovative knitting patterns and structures, including alternating cooling and non-cooling yarns to create heathered or melange effects. This capability broadens the aesthetic appeal of the invention while maintaining its functional advantages. Furthermore, the invention supports the use of a range of Polyethylene types, such as low-density (LDPE), linear low-density (LLDPE), and ultra- high-molecular- weight polyethylene (UHMWPE), allowing for customization of thermal and mechanical properties. The versatility of the cooling yarn extends to garments of various types, including T-shirts, leggings, sports bras, and socks, which can be tailored for specific use cases and user preferences.

[0112] Some embodiments thus introduce a bi-component cooling yarn that combines the thermal transparency of Polyethylene with the functional and aesthetic properties of Polyamide, Nylon, or Polyester. Through advanced co-extrusion techniques, some embodiments create a durable, chemically bonded yarn structure that optimizes heat dissipation, sweat management, and comfort. The yarn can be seamlessly integrated into garments with targeted or universal cooling zones, multi-layer configurations, and aesthetic enhancements. Its ability to address a range of problems, from excessive heat retention to inefficient sweat management, makes it a versatile solution for various applications. Some embodiments may enhance user comfort and performance.

[0113] Some embodiments may solve, prevent, cure and / or mitigate one or more, or some, or all, of the following problems that conventional yarns and garments have: (1) Excess Body Heat Retention, as conventional fabrics trap infrared radiation, reflecting it back to the body and causing overheating; whereas, some embodiments mitigate heat retention by using infrared- transparent Polyethylene, allowing the body to cool naturally through thermal radiation. (2) Limited Cooling Options for Active Individuals, as athletes and physically activeindividuals lack fabrics that facilitate efficient cooling; whereas some embodiments provide a yarn that reduces body temperature during activity by enabling heat dissipation through specialized materials. (3) Inefficient Sweat Management, as many conventional garments poorly manage sweat, leading to discomfort and prolonged drying times; whereas some embodiments provide a dual-layer structure that combines hydrophobic Polyethylene with sweat-wicking materials, ensuring rapid evaporation and dryness. (4) Uncolored Polyethylene Fabrics, due to Polyethylene’s inability to retain color which limits its aesthetic application; whereas by co-extruding with dyed Polyamide, Nylon, or Polyester, some embodiments produce cooling yarns that are both functional and visually appealing. (5) Heat Discomfort for Sensitive Populations or sensitive individuals, such as pregnant women or seniors, who may experience heat-related discomfort; whereas some embodiments provide a solution by creating garments that actively reduce heat, improving comfort for these groups. (6) Fabric Durability under Thermal Stress, as conventional fabrics degrade under high heat or prolonged thermal exposure; whereas some embodiments provide a co-extruded chemically bonded yarn structure that enhances durability while maintaining cooling properties. (7) Restricted Fabric Design Versatility, as conventional textiles lack design flexibility for seamless integration into garments; whereas some embodiments enable innovative designs and garment structures, including multi-layered fabrics and patterned knitting structures. (8) Poor Infrared Radiation Transparency, as conventional fabrics block body-generated infrared radiation, reducing cooling efficiency; whereas some embodiments allow infrared radiation to pass through Polyethylene, significantly enhancing the cooling capacity of textiles. (9) Energy Overuse in Cooling Environments, as excessive use of air conditioning increases energy consumption and costs; whereas, by incorporating this cooling yarn and cooling fabric into garments, individuals can experience comfort without relying heavily on artificial cooling systems, thereby reducing energy consumption and electricity consumption. (10) Limited Applications for Polyethylene in conventional wearables, as Polyethylene’s low dye affinity and limited adoption in conventional textiles reduce its potential in conventional applications; whereas some embodiments integrate Polyethylene into wearable fabrics, expanding its use case while retaining functionality and aesthetics.

[0114] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and a colored or dyed Polyamide, Nylon, or Polyester, co-extruded to form a single yarn that is transparent to infrared radiation while providing color or dye properties.

[0115] Some embodiments provide a cooling yarn consisting of a core of Polyethylene surrounded by an outer coating of colored or dyed Polyamide, Nylon, or Polyester, wherein the outer coating provides color while the core allows infrared transparency.

[0116] Some embodiments provide a cooling yarn comprising a core of Polyamide, Nylon, or Polyester surrounded by a Polyethylene coating, wherein the coating enhances cooling by permitting infrared radiation to pass through.

[0117] Some embodiments provide a cooling yarn comprising two interwoven or twisted filaments, or two chemically-interwoven (in the molecular level) and / or twisted filaments, one of Polyethylene and the other of colored or dyed Polyamide, Nylon, or Polyester, wherein the twisting or braiding or chemical mixture due to co-extrusion creates a blended cooling and visual effect.

[0118] Some embodiments provide a cooling yarn consisting of a braided structure where Polyethylene and colored or dyed Polyamide, Nylon, or Polyester filaments are chemically bonded to form a non-detachable composite.

[0119] Some embodiments provide a cooling yarn formed as a triple-layer composite, comprising a central layer of Polyethylene sandwiched between two layers of colored or dyed Polyamide, Nylon, or Polyester.

[0120] Some embodiments provide a cooling yarn formed as a triple-layer composite, comprising a central layer of Polyamide, Nylon, or Polyester sandwiched between two layers of Polyethylene, providing enhanced cooling and sweat management.

[0121] Some embodiments provide a cooling yarn comprising a coaxial configuration where a central elongated cylindrical Polyethylene core is non-detachably coated with colored or dyed Polyamide, Nylon, or Polyester.

[0122] Some embodiments provide a cooling yarn comprising a coaxial configuration where a central elongated cylindrical core of colored or dyed Polyamide, Nylon, or Polyester is non-detachably coated with Polyethylene.

[0123] Some embodiments provide a cooling yarn comprising alternating segments of Polyethylene and colored or dyed Polyamide, Nylon, or Polyester within a single yarn structure to create a patterned cooling and aesthetic effect.

[0124] Some embodiments provide a cooling yarn comprising a seamless composite produced by co-extruding Polyethylene and colored or dyed Polyamide, Nylon, or Polyester, wherein the materials partially penetrate each other to enhance bonding.

[0125] Some embodiments provide a cooling yarn comprising a single-layer blend of Polyethylene and Polyamide, Nylon, or Polyester, wherein the proportion of Polyethylene is sufficient to provide infrared transparency without compromising fabric integrity.

[0126] Some embodiments provide a cooling yarn formed using a feed-controlled knitting process, wherein Polyethylene and colored or dyed Polyamide, Nylon, or Polyester are selectively incorporated to produce a gradient or heathered visual effect.

[0127] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester co-extruded with an adhesive bonding agent to improve the interconnection of the materials within the yarn.

[0128] Some embodiments provide a cooling yarn comprising a twisted or braided structure wherein the Polyethylene component and the colored or dyed Polyamide, Nylon, or Polyester component are integrated through a single co-extrusion process to ensure durability and cooling efficiency.

[0129] Some embodiments provide a cooling yarn comprising Polyethylene and a colored or dyed Polyamide, Nylon, or Polyester, wherein the yarn is produced through a triple extrusion process with an adhesive bonding agent incorporated between the components to improve structural integrity.

[0130] Some embodiments provide a cooling yarn formed by co-extruding Polyethylene with Polyamide, Nylon, or Polyester, where the resulting yarn includes a non-linear, wave-like contact region between the materials to enhance flexibility and bonding.

[0131] Some embodiments provide a cooling yarn comprising Polyethylene fibers produced with a metallocene catalyst, wherein the fibers exhibit a narrow molecular weight distribution to optimize infrared transparency and cooling efficiency.

[0132] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the yarn includes a knitted alternating structure of cooling and non-cooling yarns to provide a melange visual effect and varied thermal properties.

[0133] Some embodiments provide a cooling yarn consisting of a seamless circular crosssection produced by co-extruding Polyethylene with Polyamide, Nylon, or Polyester, where the yarn achieves uniform thermal and mechanical properties along its length.

[0134] Some embodiments provide a cooling yarn formed as a bi -component composite comprising a Polyethylene component with hydrophobic properties and a Polyamide, Nylon, or Polyester component with hydrophilic properties to improve sweat-wicking and cooling.

[0135] Some embodiments provide a cooling yarn comprising a blend of Polyethylene and Polyamide, Nylon, or Polyester; wherein the Polyethylene content is greater than 75% byweight, allowing the yarn to maximize infrared transparency while maintaining structural durability.

[0136] Some embodiments provide a cooling yarn, wherein Polyethylene is chemically combined and / or is co-extruded with Polyamide, Nylon, or Polyester using a multi-manifold extrusion system that facilitates the production of dual-layer or multi-layer composite structures.

[0137] Some embodiments provide a cooling yarn produced using a dual extrusion system where Polyethylene is extruded alongside Polyamide, Nylon, or Polyester, and the two materials are aligned in parallel and bonded during the cooling stage.

[0138] Some embodiments provide a cooling yarn comprising a Polyethylene layer that acts as a barrier to prevent infrared reflection, coupled with a colored Polyamide, Nylon, or Polyester layer that enhances aesthetic appeal and provides sweat management.

[0139] Some embodiments provide a cooling yarn, wherein the Polyethylene component is selected from the group consisting of LDPE, LLDPE, MDPE, HDPE, VLDPE, XLPE, and UHMWPE, and is tailored to provide specific thermal and mechanical properties.

[0140] Some embodiments provide a cooling yarn formed by a triple extrusion process, wherein a Polyethylene core is encased between two concentric layers of colored or dyed Polyamide, Nylon, or Polyester to create a triple-layer structure optimized for cooling and dyeing.

[0141] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, where the components are co-extruded and then spun to form elongated filaments that increase tensile strength and cooling efficiency.

[0142] Some embodiments provide a cooling yarn comprising a bi-component structure, wherein the Polyethylene component has a thickness-to-diameter ratio optimized to enhance cooling properties, while the Polyamide, Nylon, or Polyester component is designed for sweat- wicking.

[0143] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyethylene component includes ultra-high- molecular-weight fibers to enhance durability and infrared transparency.

[0144] Some embodiments provide a cooling yarn, wherein the Polyethylene and Polyamide, Nylon, or Polyester components are co-extruded in a helical configuration, forming a spiral structure that enhances elasticity and thermal dissipation.

[0145] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the yarn is structured with alternating micro-layers of the components to optimize cooling performance and fabric texture.

[0146] Some embodiments provide a cooling yarn wherein the Polyethylene component is dope-dyed or solution-dyed during extrusion, producing a colored composite yarn with both cooling and aesthetic properties.

[0147] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the yarn is treated with a surface texturing process to enhance wicking properties and airflow through the fabric.

[0148] Some embodiments provide a cooling yarn produced using a triple-extrusion process, wherein an adhesive bonding agent is uniformly distributed between Polyethylene and Polyamide, Nylon, or Polyester layers to improve interfacial bonding and yarn flexibility.

[0149] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the yarn includes an external hydrophobic coating to accelerate sweat evaporation and improve wearer comfort.

[0150] Some embodiments provide a cooling yarn formed as a multi-filament composite, where Polyethylene fibers are interspersed with Polyamide, Nylon, or Polyester fibers in a specific ratio to balance cooling performance and tensile strength.

[0151] Some embodiments provide a cooling yarn, wherein the Polyethylene component is processed with a narrow molecular weight distribution to minimize thermal resistance and improve infrared transparency.

[0152] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyethylene component includes cross-linked polymer chains to enhance temperature resistance and stability during high-performance activities.

[0153] Some embodiments provide a cooling yarn formed with a coaxial extrusion process, wherein the thickness of the Polyethylene and Polyamide, Nylon, or Polyester layers is adjustable to customize cooling and aesthetic properties.

[0154] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the yarn is designed with a seamless structure for use in circular knitting machines to create stretchable, cooling fabrics.

[0155] Some embodiments provide a cooling yarn wherein the Polyethylene component is mixed with additives or nanomaterials that enhance infrared radiation transparency while maintaining the physical integrity of the yarn.

[0156] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester, wherein the weight or volume of the Polyethylene component is at least 1.25 times that of the Polyamide, Nylon, or Polyester component.

[0157] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the ratio of the weight of the Polyethylene component to the weight of the Polyamide, Nylon, or Polyester component is in the range of 1.5 to 3.

[0158] Some embodiments provide a cooling yarn formed of Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyethylene component constitutes at least 70% of the total weight of the yarn, and the remainder is the Polyamide, Nylon, or Polyester component.

[0159] Some embodiments provide a cooling yarn comprising a coaxial extrusion structure, wherein the ratio of the outer diameter of the Polyethylene layer to the inner diameter of the Polyamide, Nylon, or Polyester core is at least 2.

[0160] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyethylene component is configured to occupy a volume that is at least 1.5 times the volume of the Polyamide, Nylon, or Polyester component along a defined length of the yarn.

[0161] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the ratio of the Polyethylene component to the Polyamide, Nylon, or Polyester component by weight is in the range of 2.5 to 5.

[0162] Some embodiments provide a cooling yarn formed of Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyethylene component constitutes at least 80% of the total volume of the yarn, and the remainder is the Polyamide, Nylon, or Polyester component.

[0163] Some embodiments provide a cooling yarn comprising a multi-layer composite structure, wherein the outer Polyethylene layer has a thickness that is at least 1.5 times the thickness of the inner Polyamide, Nylon, or Polyester core.

[0164] Some embodiments provide a cooling yarn comprising a blend of Polyethylene and Polyamide, Nylon, or Polyester, wherein the proportion of Polyethylene is in the range of 75% to 90% by volume, providing enhanced cooling and structural integrity.

[0165] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the ratio of the volume of the Polyethylene component to the Polyamide, Nylon, or Polyester component is in the range of 2 to 4, ensuring optimal thermal radiation transparency and fabric flexibility.

[0166] Some embodiments provide a cooling yarn a cooling yarn comprising a bicomponent structure of Polyethylene and Polyamide, Nylon, or Polyester, wherein the ratio of the compression section length of the extrusion screw for Polyethylene to the compression section length of the extrusion screw for Polyamide, Nylon, or Polyester is in the range of 1.5 to 2.5.

[0167] Some embodiments provide a cooling yarn produced by co-extruding Polyethylene and Polyamide, Nylon, or Polyester, wherein the length of the compression section of the Polyethylene extrusion screw is at least 1.75 times the length of the compression section of the

[0168] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the outer layer of the garment-region contains at least 1.25 times the percentage of Cooling Yarns by weight compared to the inner layer of that garment-region.

[0169] Some embodiments provide a cooling yarn for use in a garment-region comprising an inner and an outer layer, wherein the percentage of Cooling Yarns in the outer layer of the garment-region is at least 1.5 times greater than the percentage in the inner layer of said garment-region.

[0170] Some embodiments provide a cooling yarn multiple-materials composite, that is used in a garment-region; wherein the outer layer of the garment-region contains Cooling Yarns at a ratio of at least 2 times the percentage of Cooling Yarns in the inner layer (by weight) of that same garment-region.

[0171] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the outer layer of a garment-region is formed of at least 2.5 times the percentage of Cooling Yarns by weight compared to the inner layer of that garment-region.

[0172] Some embodiments provide a cooling yarn, used to make a garment-region; wherein the ratio of (i) Cooling Yarns in the outer layer of the garment-region to (ii) Cooling Yarns in the inner layer of that garment-region, is in the range of 1.5 to 3.

[0173] Some embodiments provide a cooling yarn for a garment or garment-region; wherein the Cooling Yarns in the outer layer of the garment -region constitute at least 75% of the weight, while the inner layer of that garment-region contains no more than 50% Cooling Yarns by weight.

[0174] Some embodiments provide a cooling yarn for a garment-region, wherein the outer layer of that garment-region contains Cooling Yarns in a proportion that is at least 3 times greater (by weight, and / or by yarn count) than that of the inner layer of that garment-region.

[0175] Some embodiments provide a cooling yarn, wherein the ratio of Cooling Yarns in the outer layer of the garment-region to the inner layer of that garment-region is at least 2, optimizing thermal regulation properties.

[0176] Some embodiments provide a cooling yarn comprising a bi-component structure, wherein the outer layer of the garment-region contains Cooling Yarns in the range of 50% to 99% by weight, and the inner layer of that garment-region contains Cooling Yarns in the range of 25% to 50% by weight.

[0177] Some embodiments provide a cooling yarn comprising a bi-component structure, wherein the outer layer of the garment-region contains Cooling Yarns in the range of 50% to 99% by yarn count or by thread count, and the inner layer of that garment-region contains Cooling Yarns in the range of 25% to 50% by yarn count or by thread count.

[0178] Some embodiments provide a cooling yarn for a garment-region, wherein the percentage of Cooling Yarns in the outer layer of the garment-region is at least 1.75 times the percentage of Cooling Yarns in the inner layer of that garment-region, ensuring enhanced infrared transparency.

[0179] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the length of the compression section of the extrusion screw for the Polyethylene component is at least 1.5 times the length of the compression section of the extrusion screw for the Polyamide, Nylon, or Polyester component.

[0180] In some embodiments, the transition section of the extrusion screw for the Polyethylene component is at least 2 times longer than the transition section of the extrusion screw for the Polyamide, Nylon, or Polyester component.

[0181] In some embodiments, the ratio of the compression section length of the extrusion screw for Polyethylene to that for Polyamide, Nylon, or Polyester is in the range of 1.5 to 3.

[0182] In some embodiments, the extrusion screw for the Polyethylene component includes a compression section length that is at least 2 times the compression section length of the extrusion screw for the Polyamide, Nylon, or Polyester component.

[0183] In some embodiments, the transition section of the extrusion screw for Polyethylene is optimized to be 3 times the length of the transition section for Polyamide, Nylon, or Polyester.

[0184] In some embodiments, the ratio of the compression section length of the extrusion screw for Polyethylene to that of the extrusion screw for Polyamide, Nylon, or Polyester is between 2 and 2.5.

[0185] In some embodiments, the compression section of the Polyethylene extrusion screw is at least 2.5 times longer than the compression section of the Polyamide, Nylon, or Polyester extrusion screw.

[0186] Some embodiments provide a cooling yarn produced through a dual extrusion process, wherein the compression section of the extrusion screw for Polyethylene is designed to be at least 3 times longer than the compression section of the extrusion screw for Polyamide, Nylon, or Polyester.

[0187] In some embodiments, the compression section length of the extrusion screw for Polyethylene is configured to be 1.5 to 2.5 times the compression section length for Polyamide, Nylon, or Polyester.

[0188] In some embodiments, the extrusion screw for Polyethylene includes a compression section that is at least 1.75 times the length of the compression section of the extrusion screw for Polyamide, Nylon, or Polyester, enabling optimized cooling yarn production.

[0189] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester, wherein the weight or volume of the Polyamide, Nylon, or Polyester component is at least 1.25 times the weight or volume of the Polyethylene component.

[0190] Some embodiments provide a cooling yarn formed of Polyethylene and Polyamide, Nylon, or Polyester, wherein the Polyamide, Nylon, or Polyester component constitutes at least 1.5 times the weight or volume of the Polyethylene component.

[0191] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the ratio of the weight of the Polyamide, Nylon, or Polyester component to the weight of the Polyethylene component is in the range of 1.5 to 3.

[0192] Some embodiments provide a cooling yarn, wherein the Polyamide, Nylon, or Polyester component is present at a volume that is at least 1.75 times the volume of the Polyethylene component.

[0193] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester; wherein the Polyamide, Nylon, or Polyester component is at least twice the weight of the Polyethylene component.

[0194] Some embodiments provide a cooling yarn formed of Polyethylene and Polyamide, Nylon, or Polyester; wherein the ratio of the Polyamide, Nylon, or Polyester component to the Polyethylene component is configured to be between 2 and 2.5 by volume.

[0195] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester; wherein the Polyamide, Nylon, or Polyester component is atleast 2.5 times the weight of the Polyethylene component to provide balanced cooling and dyeing properties.

[0196] Some embodiments provide a cooling yarn, wherein the Polyamide, Nylon, or Polyester component constitutes at least 3 times the volume of the Polyethylene component, ensuring optimal fabric flexibility and aesthetic properties.

[0197] Some embodiments provide a cooling yarn comprising a bi-component structure; wherein the Polyamide, Nylon, or Polyester component is at least 1.75 times the volume of the Polyethylene component, with the ratio designed for specific cooling and structural characteristics.

[0198] Some embodiments provide a cooling yarn formed of Polyethylene and Polyamide, Nylon, or Polyester; wherein the weight of the Polyamide, Nylon, or Polyester component is in a ratio of at least 2.5 to 1 compared to the Polyethylene component, enhancing its dyeing and thermal properties.

[0199] Some embodiments provide a cooling yarn comprising a Polyethylene core and a Polyamide, Nylon, or Polyester coating, wherein the ratio of the outer layer radius to the core radius is at least 1.25.

[0200] Some embodiments provide a cooling yarn, wherein the outer layer radius formed by Polyamide, Nylon, or Polyester is at least 1.5 times the radius of the inner Polyethylene core, enhancing thermal and aesthetic properties.

[0201] Some embodiments provide a cooling yarn comprising a bi-layer structure, wherein the ratio of the radius of the outer layer to the radius of the inner core is in the range of 1.5 to 2.

[0202] Some embodiments provide a cooling yarn formed by co-extrusion, wherein the outer layer of Polyamide, Nylon, or Polyester has a radius that is at least 2 times the radius of the Polyethylene core.

[0203] Some embodiments provide a cooling yarn, wherein the Polyamide, Nylon, or Polyester outer layer radius of the cooling yarn is at least 2.5 times the Polyethylene core radius, providing optimized structural and dyeing characteristics.

[0204] Some embodiments provide a cooling yarn, comprising a central Polyethylene core and a surrounding Polyamide, Nylon, or Polyester layer, wherein the ratio of the outer layer radius to the inner core radius is in the range of 2 to 3.

[0205] Some embodiments provide a cooling yarn, wherein the outer layer of the yarn is composed of Polyamide, Nylon, or Polyester and is at least 3 times the radius of the Polyethylene core of that yarn.

[0206] Some embodiments provide a cooling yarn formed as a coaxial composite, wherein the outer layer of Polyamide, Nylon, or Polyester of the cooling yarn has a radius that is at least 1.75 times the Polyethylene core radius.

[0207] Some embodiments provide a cooling yarn comprising a bi-component structure, wherein the ratio of the outer Polyamide, Nylon, or Polyester layer radius to the inner Polyethylene core radius is in the range of 2.5 to 5.

[0208] Some embodiments provide a cooling yarn, wherein the radius of the outer layer of Polyamide, Nylon, or Polyester of the cooling yarn is at least 1.5 times but not more than 3 times the radius of the Polyethylene core.

[0209] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester; wherein the ratio of the weight of the Polyethylene component to the weight of the Polyamide, Nylon, or Polyester component is in the range of 1.25 to 3.

[0210] Some embodiments provide a cooling yarn comprising a blend of Polyethylene and Polyamide, Nylon, or Polyester; wherein the weight or volume of the Polyethylene component constitutes at least 1.5 times that of the Polyamide, Nylon, or Polyester component.

[0211] Some embodiments provide a cooling yarn formed by co-extrusion of Polyethylene and Polyamide, Nylon, or Polyester; wherein the Polyethylene component constitutes between 60% and 75% of the total weight of the yarn.

[0212] Some embodiments provide a cooling yarn, wherein the weight or volume of the Polyethylene component is configured to be at least 1.75 times the weight or volume of the Polyamide, Nylon, or Polyester component.

[0213] Some embodiments provide a cooling yarn comprising a bi-layer structure, wherein the Polyethylene component constitutes at least 2 times the weight or volume of the Polyamide, Nylon, or Polyester component.

[0214] Some embodiments provide a cooling yarn, wherein the Polyethylene component constitutes 70% to 85% of the total weight of the yarn.

[0215] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester; wherein the ratio of the Polyethylene component to the Polyamide, Nylon, or Polyester component by weight is at least 2.5.

[0216] Some embodiments provide a cooling yarn comprising a bi-component structure, wherein the Polyethylene component accounts for at least 75% of the total weight of the yarn.

[0217] Some embodiments provide a cooling yarn, wherein the Polyethylene component constitutes between 75% and 95% of the total weight.

[0218] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester; wherein the weight of the Polyethylene component is at least 3 times the weight of the Polyamide, Nylon, or Polyester component.

[0219] Some embodiments provide a cooling yarn comprising a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester; wherein the two components are chemically bonded to each other through a co-extrusion process, forming an inseparable composite yarn.

[0220] Some embodiments provide a cooling yarn formed through co-extrusion, wherein Polyethylene and Polyamide, Nylon, or Polyester are chemically bonded during the extrusion process, resulting in a single integrated yarn structure that cannot be mechanically separated or detached without damaging or ruining or destroying the yarn or its mechanical integrity or its physical integrity.

[0221] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the materials are co-extruded to chemically bond at a molecular level, preventing detachment or unraveling under mechanical stress.

[0222] Some embodiments provide a cooling yarn, wherein Polyethylene and Polyamide, Nylon, or Polyester are co-extruded to form a chemically bonded interface, ensuring structural integrity and eliminating the possibility of mechanical separation into discrete threads.

[0223] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester, wherein the two layers are integrally bonded through co- extrusion such that they cannot be distinguished or detached as separate threads after production.

[0224] Some embodiments provide a cooling yarn formed by co-extrusion, wherein the Polyethylene and Polyamide, Nylon, or Polyester components create a continuous, chemically bonded interface that enhances durability and eliminates the need for post-extrusion mechanical braiding.

[0225] Some embodiments provide a cooling yarn, wherein the Polyethylene and Polyamide, Nylon, or Polyester components are chemically fused during co-extrusion, forming a unified structure with a wave-like interpenetrating boundary that cannot be separated mechanically.

[0226] Some embodiments provide a cooling yarn comprising Polyethylene and Polyamide, Nylon, or Polyester; wherein the components are chemically bonded via co- extrusion, producing a seamless composite yarn with integrated cooling and structural properties.

[0227] Some embodiments provide a cooling yarn formed through co-extrusion, wherein Polyethylene and Polyamide, Nylon, or Polyester are chemically combined to create a yarn that is resistant to separation and provides uniform performance across its length.

[0228] Some embodiments provide a cooling yarn comprising a chemically bonded interface between Polyethylene and Polyamide, Nylon, or Polyester, achieved through coextrusion, wherein the bonding ensures the cooling yarn’s cohesive thermal and mechanical functionality without relying on (or without having) mechanical braiding.

[0229] Some embodiments provide a garment comprising one or more garment-regions formed exclusively of Cooling Yarn, wherein the Cooling Yarn includes a bi-component structure of Polyethylene and Polyamide, Nylon, or Polyester to enhance thermal radiation transparency and wearer comfort.

[0230] Some embodiments provide a garment having one or more garment-regions formed of a blend of Cooling Yarn and non-cooling yarns, wherein the Cooling Yarn comprises Polyethylene and Polyamide, Nylon, or Polyester, optimized for heat dissipation and sweat management.

[0231] Some embodiments provide a garment comprising one or more garment-regions, wherein each region includes Cooling Yarn and other yarns in an alternating pattern to provide both cooling functionality and structural integrity, with the Cooling Yarn comprising a bicomponent structure.

[0232] Some embodiments provide a garment formed of multiple garment-regions, at least one of which is exclusively knitted using Cooling Yarn, wherein the Cooling Yarn includes Polyethylene and Polyamide, Nylon, or Polyester, ensuring targeted cooling and enhanced comfort.

[0233] Some embodiments provide a garment comprising one or more garment-regions, wherein the garment-regions include Cooling Yarn blended with natural fibers or synthetic yarns, such that the Cooling Yarn constitutes at least 50% of the region by weight.

[0234] Some embodiments provide a garment having a garment-region that comprises: an inner layer formed exclusively of Cooling Yarn, and an outer layer formed of a blend of Cooling Yarn and non-cooling yarns, wherein the inner layer facilitates thermal regulation and sweat wicking.

[0235] Some embodiments provide a garment having one or more garment-regions, wherein the Cooling Yarn comprises a co-extruded structure of Polyethylene and Polyamide, Nylon, or Polyester, integrated with other yarns to create functional zones for heat management.

[0236] Some embodiments provide a garment comprising a plurality of garment-regions, wherein specific regions, such as armpits or the back, are formed exclusively of Cooling Yarn, and other regions include a blend of Cooling Yarn and non-cooling yarns.

[0237] Some embodiments provide a garment formed entirely of Cooling Yarn, wherein the yarn is composed of a chemically bonded co-extruded structure of Polyethylene and Polyamide, Nylon, or Polyester, providing consistent cooling properties across the entire garment.

[0238] Some embodiments provide a garment comprising one or more garment-regions, wherein the Cooling Yarn and other yarns are incorporated into a seamless knitting process to form a pattern that optimizes cooling and structural support for the wearer.

[0239] The term or the phrase “Polyamide, Nylon, or Polyester”, as it appears above and / or herein, includes each of the following options: (1) only Polyamide; (2) only Nylon; (3) only Polyester; (4) a mixture or combination or blend of Polyamide and Nylon; (5) a mixture or combination or blend of Polyamide and Polyester; (6) a mixture or combination or blend of Nylon and Polyester; (7) a mixture or combination or blend of Polyamide and Nylon and Polyester.

[0240] In some embodiments, the cooling yarn is formed exclusively of Polyethylene and Polyamide, and does not include any Nylon and does not include any Polyester.

[0241] In some embodiments, the cooling yarn is formed exclusively of Polyethylene and Polyamide and Nylon, and does not include any Polyester.

[0242] In some embodiments, the cooling yarn is formed exclusively of Polyethylene and Polyamide and Polyester, and does not include any Nylon.

[0243] In some embodiments, the cooling yarn is formed exclusively of Polyethylene and Nylon, and does not include any Polyester or Polyamide.

[0244] In some embodiments, the cooling yarn is formed exclusively of Polyethylene and Polyester, and does not include any Nylon or Polyamide.

[0245] In some embodiments, the cooling yarn is formed exclusively of co-extruded Polyethylene and non-Nylon Polyamide. In some embodiments, the cooling yarn is formed exclusively of co-extruded Polyethylene and Polyamide. In some embodiments, the cooling yarn is formed exclusively of co-extruded Polyethylene and Polyester.

[0246] In some embodiments, the cooling yarn is formed exclusively of a Polyethylene filament (or mono-filament, or thread) that is braided / co-braided / twisted with / entangled with / interwound with / spiraled around a Polyamide filament (or mono-filament, or thread).

[0247] In some embodiments, the cooling yarn is formed exclusively of a Polyethylene filament (or mono-filament, or thread) that is braided / co-braided / twisted with / entangled with / interwound with / spiraled around a non-Nylon Polyamide filament (or mono-filament, or thread).

[0248] In some embodiments, the cooling yarn is formed exclusively of a Polyethylene filament (or mono-filament, or thread) that is braided / co-braided / twisted with / entangled with / interwound with / spiraled around a Polyester filament (or mono-filament, or thread).

[0249] In some embodiments, the Polyamide is a non-nylon polyamide; or a synthetic / artificial / manufactured non-nylon Polyamide; or a natural non-nylon polyamide; or is a polyamide resin that is not made from nylon or that does not include nylon. In some embodiments, the Polyamide thread / filament / masterbatch / resin is a Dimer acid-based (DAB) polyamide (reactive or non-reactive), or a Polyamide-epichlorohydrin (PAE) resin or material; or aramid(s), or sodium poly aspartate, or Polyaspartic acid (PASA) or other biodegradable / water-soluble condensation polymer based on the amino acid aspartic acid.

[0250] Some embodiments provide a garment for a wearer, comprising: a first garmentregion that is formed of a knitted Cooling Yarn, wherein the Cooling Yarn comprises: a Polyamide component, and a co-located Polyethylene component; wherein the Polyethylene component of the Cooling Yarn is transparent to infrared radiation and enables passage therethrough of bodily-generated infrared heat, outwardly away from the wearer; wherein the Polyethylene component does not absorb and does not retain dyes or coloring agents; wherein the Polyamide component absorbs and retains dyes and coloring agents; wherein the Polyamide component is colored or dyed with a dye or a coloring agent; wherein a single Cooling Yarn provides both (i) pass-through for bodily-generated infrared heat due to the Polyethylene component, and (ii) aesthetic colored visual appearance due to the Polyamide component that is colored or dyed with the dye or the coloring agent.

[0251] In some embodiments, the Polyamide component is a Polyamide thread; the Polyethylene component is a Polyethylene thread; the Polyamide thread and the Polyethylene thread are twistedly co-braided around each other.

[0252] In some embodiments, thickness of the Polyethylene thread is at least two times a thickness of the Polyamide thread.

[0253] In some embodiments, thickness of the Polyamide thread is at least two times a thickness of the Polyethylene thread.

[0254] In some embodiments, the Polyamide component is a Polyamide cylindrical core; wherein the Polyethylene component is a Polyethylene cylindrical shell that surrounds the Polyamide cylindrical core.

[0255] In some embodiments, the Polyamide component is a Polyamide cylindrical core having a radius denoted Rl; wherein the Polyethylene component is a Polyethylene cylindrical shell that surrounds the Polyamide cylindrical core, and that has an external radius denoted R2; wherein R2 is at least 2.5 times Rl.

[0256] In some embodiments, the Polyamide component is a Polyamide cylindrical core having a radius denoted Rl; wherein the Polyethylene component is a Polyethylene cylindrical shell that surrounds the Polyamide cylindrical core, and that has an external radius denoted R2; wherein R2 is at most 1.5 times Rl.

[0257] In some embodiments, the Polyethylene component is a Polyethylene cylindrical core; wherein the Polyamide component is a Polyamide cylindrical shell that surrounds the Polyethylene cylindrical core.

[0258] In some embodiments, the Polyethylene component is a Polyethylene cylindrical core having a radius denoted Rl; the Polyamide component is a Polyamide cylindrical shell that surrounds the Polyethylene cylindrical core, and that has an external radius denoted R2; wherein R2 is at least 2.5 times Rl.

[0259] In some embodiments, the Polyethylene component is a Polyethylene cylindrical core having a radius denoted Rl; the Polyamide component is a Polyamide cylindrical shell that surrounds the Polyethylene cylindrical core, and that has an external radius denoted R2; wherein R2 is at most 1.5 times Rl.

[0260] In some embodiments, the Polyamide component comprises a first layer of Polyamide and a second layer of Polyamide, that sandwich between them said Polyethylene component which is a Polyethylene component.

[0261] In some embodiments, the Cooling Yarn comprises a five-layer sandwiched yarn comprising: a top-side Polyamide layer; a central Polyethylene layer; a bottom-side Polyamide layer; a first adhesive layer between the top-side Polyamide layer and the central Polyethylene layer, which bonds together the top-side Polyamide layer and the central Polyethylene layer; a second adhesive layer between the bottom-side Polyamide layer and the central Polyethylene layer, which bonds together the bottom-side Polyamide layer and the central Polyethylene layer.

[0262] In some embodiments, the Polyethylene component comprises a first layer of Polyethylene and a second layer of Polyethylene, that sandwich between them said Polyamide component which is a Polyamide component.

[0263] In some embodiments, the Cooling Yarn comprises a five-layer sandwiched yarn comprising: a top-side Polyethylene layer; a central Polyamide layer; a bottom-side Polyethylene layer; a first adhesive layer between the top-side Polyethylene layer and the central Polyamide layer, which bonds together the top-side Polyethylene layer and the central Polyamide layer; a second adhesive layer between the bottom-side Polyethylene layer and the central Polyamide layer, which bonds together the bottom-side Polyethylene layer and the central Polyamide layer.

[0264] In some embodiments, the Cooling Yarn is a post-extrusion output of co-extrusion of Polyethylene masterbatch with Polyamide masterbatch.

[0265] In some embodiments, the Cooling Yarn is a post-extrusion output of a singlemanifold co-extrusion of Polyethylene masterbatch with Polyamide masterbatch.

[0266] In some embodiments, the Cooling Yarn is a post-extrusion output of a multimanifold co-extrusion of Polyethylene masterbatch with Polyamide masterbatch.

[0267] In some embodiments, the Cooling Yarn is a post-extrusion output of co-extrusion of Polyethylene masterbatch with Polyamide masterbatch and with a bonding agent.

[0268] In some embodiments, the Cooling Yarn is a post-extrusion output of a singlemanifold co-extrusion of Polyethylene masterbatch with Polyamide masterbatch and with a bonding agent.

[0269] In some embodiments, the Cooling Yarn is a post-extrusion output of a multimanifold co-extrusion of Polyethylene masterbatch with Polyamide masterbatch and with a bonding agent.

[0270] In some embodiments, the Cooling Yarn is a post-extrusion sandwiched output of co-extrusion of (a) a first Polyethylene masterbatch via a first manifold, and (b) a second Polyethylene masterbatch via a second manifold, and (c) a Polyamide masterbatch via a central manifold that is between the first manifold and the second manifold.

[0271] In some embodiments, the Cooling Yarn is a post-extrusion sandwiched output of co-extrusion of (a) a first Polyamide masterbatch via a first manifold, and (b) a second Polyamide masterbatch via a second manifold, and (c) a Polyethylene masterbatch via a central manifold that is between the first manifold and the second manifold.

[0272] In some embodiments, a first garment -region of said garment is formed exclusively of said knitted Cooling Yarn, and does not include any other yarn that is not said Cooling Yarn;wherein a second garment-region of said garment excludes said Cooling Yarn, and is formed exclusively of yarns that are not said Cooling Yarn.

[0273] In some embodiments, a first garment-region of said garment contains at least 75 percent, by weight or by volume or by thread-count, of said knitted Cooling Yarn; wherein a first garment-region of said garment contains less than 25 percent, by weight or by volume or by thread-count, of said knitted Cooling Yarn.

[0274] In some embodiments, at least one garment-region of said garment is formed of two fabric-layers, that include an inner fabric-layer that is closer to the wearer, and an outer fabriclayer that is further relative to the wearer; wherein a majority of the outer fabric-layer, by weight or by volume or by thread-count, is formed by knitted Cooling Yarns; wherein a minority of the outer fabric-layer, by weight or by volume or by thread-count, is formed by knitted Cooling Yarns.

[0275] In some embodiments, at least one garment-region of said garment is formed of two fabric-layers, that include an inner fabric-layer that is closer to the wearer, and an outer fabriclayer that is further relative to the wearer; wherein a minority of the outer fabric-layer, by weight or by volume or by thread-count, is formed by knitted Cooling Yarns; wherein a majority of the outer fabric-layer, by weight or by volume or by thread-count, is formed by knitted Cooling Yarns.

[0276] In some embodiments, the Cooling Yarn further comprises a Polyester thread that is co-braided with the Polyamide component and the Polyethylene component.

[0277] In some embodiments, the Polyamide component is Nylon.

[0278] In some embodiments, the Polyamide component is a non-nylon Polyamide.

[0279] Some embodiments provide garment having polyethylene-based cooling yarns and cooling garment-regions, as well as methods and systems for producing or manufacturing such cooling yarns and such garments.

[0280] In some embodiments, a garment or a garment-region is knitted, such as by using a circular knitting machine, from two yarns that form two fabric-layers: a first fabric-layer formed of a Cooling Yarn, and a second fabric-layer formed of another yarn (or a set of other yarns) that is not the Cooling Yarn or that does not include the Cooling Yarn.

[0281] In some embodiments, the Cooling Yarn can be, for example, a yarn formed of 100 percent of polyethylene (PE), or a yarn formed of 100 percent of High-Density Polyethylene (HDPE).

[0282] In other embodiments, the Cooling Yarn is a bi-component yarn or a dualcomponent yarn; for example, a co-extrusion output of (i) PE / HDPE with (ii) Polyamide / Nylon / Polyester / Non-Nylon Polyamide.

[0283] In other embodiments, the Cooling Yarn is a braided yarn formed of co-braided threads such as: (i) a PE / HDPE thread, co-braided with or spiraling around (ii) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide thread.

[0284] In other embodiments, the Cooling Yarn is formed of: (i) a PE / HDPE core or thread, that is coated by (ii) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide coating or shell.

[0285] In other embodiments, the Cooling Yarn is formed of: (i) a Polyamide / Nylon / Polyester / Non-Nylon Polyamide core or thread, that is coated by (ii) a PE / HDPE coating or shell.

[0286] In some embodiments, the first fabric-layer mentioned above is an inner fabric-layer or an inwardly-facing fabric layer or body-touching fabric layer, that directly touches the body of the human wearer; whereas, the second fabric-layer mentioned above is an outer fabric-layer or an outwardly-facing fabric layer or a non-body-touching fabric layer.

[0287] In other embodiments, the second fabric-layer mentioned above is an inner fabriclayer or an inwardly-facing fabric layer or body-touching fabric layer, that directly touches the body of the human wearer; whereas, the first fabric-layer mentioned above is an outer fabriclayer or an outwardly-facing fabric layer or a non-body-touching fabric layer.

[0288] In some embodiments, the inner fabric-layer or the inwardly-facing fabric layer or body-touching fabric layer is formed exclusively of PE / HDPE; whereas, the outer fabric-layer or the outwardly-facing fabric layer or the non-body-touching fabric layer is knitted of any other non-cooling yarn(s), such as Cotton or Wool or Modal or Polyester or Nylon or Polyamide or non-Nylon Polyamide or other non-cooling yarn, or a combination or mixture or two or more of such non-cooling yarns.

[0289] In some embodiments, the outer fabric-layer or the outwardly-facing fabric layer or the non-body-touching fabric layer is formed exclusively of PE / HDPE; whereas, the inner fabric-layer or the inwardly-facing fabric layer or the body-touching fabric layer is knitted of any other non-cooling yarn(s), such as Cotton or Wool or Modal or Polyester or Nylon or Polyamide or non-Nylon Polyamide or other non-cooling yarn, or a combination or mixture or two or more of such non-cooling yarns.

[0290] In some embodiments, the fabric-layer that is formed of the Cooling Yarn, such as from Polyethylene (PE) or HDPE, has high Infrared transparency, which allows the humanbody to cool via thermal radiation. Instead of keeping or absorbing the thermal radiation that the human body radiates, the PE / HDEP / cooling yarn allows all, or most, of such body- radiated thermal radiation and / or body-radiated Infrared radiation to pass-through and to exit outwardly away from the human body.

[0291] Additionally or alternatively, the PE / HDEP / cooling yarn is, or can be, a hydrophobic yarn or a fast-drying yarn; such as, a yarn that was treated with, or coated with, or infused with, or formed with, or soaked in, a hydrophobic agent or a hydrophobic material or a hydrophobic solution or a hydrophobic composition; such that it also dries rapidly during or after physical exercise by the human wearer, which can further improve the convenience of the human wearer.

[0292] In some embodiments, the two fabric-layers (inner layer and outer layer) can be glued or bonded to each other, via a bonding material or gluing material or adhesive tape, or using ultrasonic connections or using seams or stitches or other connection mechanisms. In other embodiments, there is No Glue and No Adhesive and No Bonding Material between the inner fabric-layer and the outer fabric-layer, but rather, the two fabric layers are a continuous fabric that is knitted by using a circular knitting machine that is fed two different yarns (the Cooling Yarn for one fabric-layer, and the non-cooling-yarn(s) for the other fabric-layer) and that knits together the garment as a continuous dual-layer fabric such that the outer fabric-layer is knitted from one of the two yarns and the inner fabric-layer is knitted from the other of the two yarns, such that there is not need for any glue or bonding material or other adhesive between the two fabric-layers.

[0293] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer; wherein one of the two fabric-layers is formed of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein another of the two fabric-layers is formed of one or more yarns, that exclude said Cooling Yarn.

[0294] In some embodiments, the Cooling Yarn is formed exclusively from Polyethylene (PE) or High-Density Polyethylene (HDPE).

[0295] In some embodiments, the Cooling Yarn is formed of: (i) a thread formed of Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-braided or spirals around (ii) a thread formed of Polyamide that absorbs and retains dyes and coloring agents.

[0296] In some embodiments, the Cooling Yarn is formed of: (i) a thread formed of Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-braided or spirals around (ii) a thread formed of Polyester that absorbs and retains dyes and coloring agents.

[0297] In some embodiments, the Cooling Yarn is a co-extrusion output of: (i) Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-extruded together with (ii) Polyamide.

[0298] In some embodiments, the Cooling Yarn is a co-extrusion output of: (i) Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-extruded together with (ii) Polyester.

[0299] In some embodiments, the Cooling Yarn is formed exclusively from one of: Polyethylene (PE) that was treated or soaked or infused or coated or mixed with a hydrophobic material; High-Density Polyethylene (HDPE) that was treated or soaked or infused or coated or mixed with a hydrophobic material.

[0300] In some embodiments, the Cooling Yarn is a bi-component yarn that is formed of: a first component that is PE or HDPE, and a second component that is Polyamide or Polyester.

[0301] In some embodiments, the Cooling Yarn is a yarn that was treated or soaked or infused or coated or mixed with a hydrophobic material.

[0302] In some embodiments, the fabric-layer that is formed of said Cooling Yarn, comprises is formed exclusively from said Cooling Yarn.

[0303] In some embodiments, the fabric-layer that is formed of said Cooling Y arn, includes said Cooling Yarn in over 50 percent by weight or by volume or by thread-count.

[0304] In some embodiments, said Cooling Yarn passes therethrough at least 99 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 95 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 90 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 80 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 75 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 67 percent of infrared radiation. In some embodiments, said Cooling Yarn passes therethrough at least 51 percent of infrared radiation.

[0305] In some embodiments, the inner-side fabric-layer is the fabric-layer that is formed of said Cooling Yarn; wherein the outer-side fabric-layer is the other fabric-layer that excludes said Cooling Yarn.

[0306] In some embodiments, the outer-side fabric-layer is the fabric-layer that is formed of said Cooling Yarn; wherein the inner-side fabric-layer is the other fabric-layer that excludes said Cooling Yarn.

[0307] In some embodiments, the garment excludes and does not have any glue or adhesive or bonding material, between the first fabric-layer and the second fabric-layer.

[0308] In some embodiments, the first fabric-layer and the second fabric-layer are a continuous singular knitted fabric, which is an output of a circular knitting machine that continuously knits said singular knitted fabric as a dual-layer fabric that has an inner layer formed of a first yarn and an outer layer formed of a second yarn; wherein the first fabric-layer and the second fabric-layer directly touch each other and are not touching any glue or adhesive or bonding material, and are now sandwiching or trapping between them any glue or adhesive or bonding material.

[0309] In some embodiments, said first garment-region comprises an entirety of the garment.

[0310] In some embodiments, said first garment-region comprises an entirety of the garment and is entirely seamless or seam-free and lacks any seams.

[0311] In some embodiments, said first garment-region is only a portion of said garment and is not an entirety of said garment; wherein said first garment-region is immediately adjacent to a second garment-region, that is formed of fabric that lacks any Cooling Yarn.

[0312] In some embodiments, the first garment-region is structured to cover a highly- sweating body-region of the wearer.

[0313] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outerside fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Y arn.

[0314] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Y arn.

[0315] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outerside fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Y arn.

[0316] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Y arn.

[0317] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0318] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0319] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 51percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0320] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0321] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0322] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0323] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0324] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer,and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that exclude said Cooling Yarn.

[0325] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0326] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0327] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0328] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one ormore yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0329] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 75 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0330] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed exclusively of a Cooling Yarn, that enables passage therethrough of at least 90 percent of infrared radiation that is radiated by the wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn, or that include said Cooling Yarn by not more than 49.9 percent by weight and / or by volume.

[0331] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed such that a majority (over 50 percent, by weight and / or volume and / or threadcount) of its yarn or yarns is a Cooling Yarn, that enables passage therethrough of at least 51 percent (or, at least 75 percent; or, at least 90 percent) of infrared radiation that is radiated by the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn or that is formed such that a minority (less than 50 percent, by weight and / or volume and / or thread-count) of its yarn or yarns is a Cooling Yarn.

[0332] Some embodiments provide a garment for a wearer, comprising: a first garmentregion having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer, and is formed such that a majority (over 50 percent, by weight and / or volume and / or threadcount) of its yarn or yarns is a Cooling Yarn, that enables passage therethrough of at least 51 percent (or, at least 75 percent; or, at least 90 percent) of infrared radiation that is radiated bythe wearer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer, and is formed of one or more yarns, that either exclude said Cooling Yarn or that is formed such that a minority (less than 50 percent, by weight and / or volume and / or thread-count) of its yarn or yarns is a Cooling Yarn.

[0333] Some embodiments may be implemented by using a machine or an automated or semi-automatic production line, which may comprise, for example: cutting unit, welding unit, bonding unit, extrusion unit, co-extrusion unit, coating unit, spiraling unit, spinning unit, rotating unit, twisting unit, sewing unit, stitching unit, ultrasonic operations unit, ultrasonic cutting unit, gluing unit, ultrasonic bonding unit, ultrasonic gluing unit, folding unit, adhesive painting unit or adhesive application unit or adhesive coating unit, heat-sealing unit, heat-and- press unit, connection-creating unit, knitting machine, circular / tubular knitting machine, seamless knitting machine, seamless circular / tubular knitting machine, weaving machine, conveyor belt, robotic arm, control unit, workstation; as well as suitable hardware components and / or software components, for example, processor to execute code, memory unit, storage unit, input unit (keyboard, mouse, touch-screen), output unit (screen, touch-screen), modems, transceivers or transmitters or receivers, wireless and / or wired communication links and / or transceivers or transmitters or receivers, power sources, Operating System (OS) and suitable applications, or the like.

[0334] Functions, operations, components and / or features described herein with reference to one or more embodiments, may be combined with, or may be utilized in combination with, one or more other functions, operations, components and / or features described herein with reference to one or more other embodiments, or vice versa.

[0335] While certain features of some embodiments have been illustrated and described herein, many modifications, substitutions, changes, and equivalents may occur to those skilled in the art. Accordingly, the claims are intended to cover all such modifications, substitutions, changes, and equivalents.

Claims

CLAIMS1. A garment for a wearer, comprising: a first garment-region having two fabric-layers which are a first fabric-layer and a second fabric-layer; wherein the first fabric-layer is an inner-side fabric-layer that is structured to directly touch the wearer; wherein the second fabric-layer is an outer-side fabric layer that is structured to not touch the wearer; wherein one of the two fabric-layers is formed of a Cooling Yarn, that enables passage therethrough of at least 51 percent of infrared radiation that is radiated by the wearer; wherein another of the two fabric-layers is formed of one or more yarns, that exclude said Cooling Yarn.

2. The garment according to claim 1, wherein the Cooling Yarn is formed exclusively from Polyethylene (PE) or High- Density Polyethylene (HDPE).

3. The garment according to claim 1, wherein the Cooling Yam is formed of:(i) a thread formed of Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-braided or spirals around(ii) a thread formed of Polyamide that absorbs and retains dyes and coloring agents.

4. The garment according to claim 1, wherein the Cooling Yarn is formed of:(i) a thread formed of Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-braided or spirals around(ii) a thread formed of Polyester that absorbs and retains dyes and coloring agents.

5. The garment according to claim 1, wherein the Cooling Yarn is a co-extrusion output of:(i) Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-extruded together with(ii) Polyamide.

6. The garment according to claim 1, wherein the Cooling Yarn is a co-extrusion output of:(i) Polyethylene (PE) or High-Density Polyethylene (HDPE), that is co-extruded together with(ii) Polyester.

7. The garment according to claim 1, wherein the Cooling Yarn is formed exclusively from one of:Polyethylene (PE) that was treated or soaked or infused or coated or mixed with a hydrophobic material;High-Density Polyethylene (HDPE) that was treated or soaked or infused or coated or mixed with a hydrophobic material.

8. The garment according to claim 1, wherein the Cooling Yarn is a bi-component yarn that is formed of: a first component that is PE or HDPE, and a second component that is Polyamide or Polyester.

9. The garment according to any one of claims 1-8, wherein the Cooling Yarn is a yarn that was treated or soaked or infused or coated or mixed with a hydrophobic material.

10. The garment according to any one of claims 1-9, wherein the fabric-layer that is formed of said Cooling Yarn, comprises is formed exclusively from said Cooling Yarn.

11. The garment according to any one of claims 1-9, wherein the fabric-layer that is formed of said Cooling Yarn, includes said Cooling Yarn in over 50 percent by weight or by volume or by thread-count.

12. The garment according to any one of claims 1-11, wherein said Cooling Yam passes therethrough at least 90 percent of infrared radiation.

13. The garment according to any one of claims 1-12, wherein the inner-side fabric-layer is the fabric-layer that is formed of said Cooling Yarn; wherein the outer-side fabric-layer is the other fabric-layer that excludes said Cooling Yarn.

14. The garment according to any one of claims 1-12, wherein the outer-side fabric-layer is the fabric-layer that is formed of said Cooling Yarn; wherein the inner-side fabric-layer is the other fabric-layer that excludes said Cooling Yarn.

15. The garment according to any one of claims 1-14, wherein the garment excludes and does not have any glue or adhesive or bonding material, between the first fabric-layer and the second fabric-layer.

16. The garment according to any one of claims 1-15, wherein the first fabric-layer and the second fabric-layer are a continuous singular knitted fabric, which is an output of a circular knitting machine that continuously knits said singular knitted fabric as a dual-layer fabric that has an inner layer formed of a first yarn and an outer layer formed of a second yarn; wherein the first fabric-layer and the second fabric-layer directly touch each other and are not touching any glue or adhesive or bonding material, and are now sandwiching or trapping between them any glue or adhesive or bonding material.

17. The garment according to any one of claims 1-16, wherein said first garment-region comprises an entirety of the garment.

18. The garment according to any one of claims 1-16, wherein said first garment-region comprises an entirety of the garment and is entirely seamless or seam-free and lacks any seams.

19. The garment according to any one of claims 1-16, wherein said first garment-region is only a portion of said garment and is not an entirety of said garment; wherein said first garment-region is immediately adjacent to a second garment-region, that is formed of fabric that lacks any Cooling Yarn.

20. The garment according to claim 19, wherein the first garment-region is structured to cover a highly-sweating body-region of the wearer.

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