A cold-weather, waterproof shoe of a multi-layer composite construction and a method of manufacturing the same

Abstract

The application discloses a kind of cold-proof waterproof shoes of multilayer composite structure and manufacturing method thereof, upper body is successively included outer layer, middle layer and inner layer from outside to inside, outer layer includes waterproof leather, waterproof leather is sewn up by sewing thread and forms the shape of upper, and waterproof sealing layer is provided on the back side of waterproof leather, waterproof sealing layer covers at least each sewing thread aperture area;Middle layer is the flexible heat-insulating material layer of self-adhesive pressure sensitive adhesive, is directly bonded to the back of outer layer by pressure sensitive adhesive;Inner layer is the laminated body that at least including surface fabric layer, heat-insulating material layer and waterproof breathable film layer are fused and pressed by flame bonding process without glue, and inner layer is set to the inside of middle layer and is attached with middle layer;The application also discloses the manufacturing method of the cold-proof waterproof shoes;The application is designed by three-layer composite structure, can still keep excellent waterproofness and thermal insulation under extremely cold environment and dynamic bending condition, simultaneously realizes no glue composite, light weight and high comfort.

Description

Technical fields: This invention relates to the field of footwear technology, and in particular to a multi-layered composite structure cold-proof and waterproof shoe that can maintain excellent warmth and waterproofness under extremely cold environments and high dynamic bending conditions, and its manufacturing method. Background technology: For winter outdoor work, polar expeditions, or daily wear in high-altitude and cold regions, footwear needs to be both waterproof and heat-insulating, preventing snowmelt from seeping in while maintaining foot temperature.

[0001] Traditional insulated shoes mostly use a single EVA foam material or a composite structure of ordinary fleece and TPU film, which has the following problems: First, the waterproof performance of existing products relies on the seam sealing treatment, but the shoe upper needs to be bent frequently during wear. After repeated bending, the seam sealing strip is prone to cracking or even falling off, resulting in waterproof failure.

[0002] Secondly, traditional insulated shoes use relatively thick and heavy insulation materials with poor breathability, which can easily lead to a stuffy and sweaty feeling when worn. The bonding of multiple layers of materials usually involves a large amount of glue, which reduces the softness of the upper material and also affects environmental friendliness.

[0003] Furthermore, in extremely cold environments below -30°C, after wearing the simulated foot model for 30 minutes, the foot temperature dropped by more than 10°C, failing to meet the warmth requirements in extreme environments. Summary of the Invention: The purpose of this invention is to provide a multi-layer composite structure cold-proof and waterproof shoe and its manufacturing method, which can maintain excellent warmth and waterproof performance in extremely cold environments (-30℃) and high dynamic waterproof environments (60,000 flexes).

[0004] Analysis revealed that the fundamental reason why existing products cannot achieve the above performance is that: the existing technology uses hot melt adhesive for full-layer bonding, which reduces the flexibility of the shoe upper and makes the adhesive layer prone to fatigue and cracking when frequently bent; the inner layer uses ordinary fleece and a single-layer TPU film, which has low heat preservation efficiency and makes it difficult for moisture to escape, resulting in dampness and heat loss in the feet; and the lack of a self-adhesive intermediate insulation layer means that the functional layers are not tightly bonded, and heat is easily lost through the gaps between the layers.

[0005] This invention provides a systematic solution to the above-mentioned problems: Option 1: A multi-layered composite structure for cold-proof and waterproof shoes includes a sole and an upper body fixedly connected to the sole. The upper body comprises, from the outside to the inside, the following components: The outer layer includes waterproof leather, which is stitched together to form the shape of the shoe upper, and a waterproof sealing layer is provided on the back side of the waterproof leather, the waterproof sealing layer covering at least the area of ​​each stitch gap; The intermediate layer is a flexible thermal insulation material layer with built-in pressure-sensitive self-adhesive, which is directly bonded to the back of the outer layer by the pressure-sensitive self-adhesive; and The inner layer is a laminate made of multiple layers of materials, including at least a surface fabric layer, a thermal insulation material layer and a waterproof and breathable membrane layer, which are melted and pressed together without glue using a flame bonding process. The inner layer is disposed inside the intermediate layer and is bonded to the intermediate layer.

[0006] Option 1 employs a fully waterproof sealing layer on the back of the outer seams, effectively blocking pinhole seepage paths and significantly improving dynamic waterproof durability. The middle layer uses a flexible thermal insulation material with built-in pressure-sensitive self-adhesive, achieving glue-free bonding, enhancing insulation efficiency, and simplifying the process. The inner layer uses a flame-bonded, glue-free composite, preventing adhesive hardening and maintaining softness and breathability. This triple-structure synergistic effect achieves four major advantages—high waterproofness, strong insulation, high comfort, and avoidance of organic solvent-based adhesives—without increasing weight.

[0007] Option 2: Option 2, based on Option 1, further defines the waterproof sealing layer as a flexible waterproof adhesive layer coated on the back of the waterproof leather, wherein the flexible waterproof adhesive layer continuously covers the entire back of the waterproof leather and fills all the stitching needle holes.

[0008] Option 2 involves applying a flexible waterproof adhesive layer after stitching, which can directionally seal every needle hole in the seam. The waterproof adhesive layer forms a large-area continuous coverage with the back of the leather, and deforms synchronously with the leather when the shoe upper is repeatedly bent without cracking, thereby greatly improving dynamic waterproof durability.

[0009] Option 3: Option 3, based on Option 1 or Option 2, further specifies that the waterproof leather is top-grain waterproof nubuck leather.

[0010] Option 3 is adopted. The top-layer waterproof nubuck leather has excellent durability and a certain degree of moisture permeability. After waterproofing treatment, it can effectively block the penetration of external moisture.

[0011] Option 4: Option 4, based on Option 1, further limits the thickness of the flexible thermal insulation material layer to 0.9 mm.

[0012] Option 4, with a thickness of 0.9mm, achieves a balance between lightweight and heat insulation efficiency, providing sufficient insulation layer thickness without increasing the burden on the shoe body.

[0013] Option 5: Option 5, based on Option 1, further defines the inner layer as a laminate made of six layers of materials melted and pressed together without glue using a flame bonding process. The six layers, from the outside to the inside, are: a finely sculpted fleece layer, a first foam layer, a composite thermal insulation layer, a second foam layer, a knitted fabric layer, and a waterproof membrane layer.

[0014] Using scheme five, a six-layer structure is formed into an integrated composite layer through a flame bonding process. The materials of each layer are physically fused together in a glue-free state, eliminating the rigid hardening effect of interlayer adhesives. The two symmetrically arranged foam layers effectively buffer the stress transmission of the outer layer, making the inner layer soft to the touch and maintaining its shape stability after multiple bends.

[0015] Option Six: Scheme 6, based on Scheme 5, further specifies that the composite insulation cotton layer is composed of ultrafine insulation fiber material.

[0016] Option 6 utilizes ultra-fine thermal insulation fiber material, which can trap a large amount of still air to form a highly efficient thermal insulation layer, achieving superior heat retention at the same thickness.

[0017] Option Seven: Scheme 7 is based on Scheme 5, and further specifies that both the first foam layer and the second foam layer are elastic foam layers.

[0018] Option 7 is adopted, with two elastic foam layers symmetrically arranged on the inner and outer sides of the composite insulation layer. During the flame bonding process, the surface of the foam layers slightly melts, achieving glue-free fusion bonding with the adjacent layers. The bonded elastic foam layers can absorb and buffer the deformation stress generated during dynamic bending of the shoe upper, preventing the internal insulation layer from permanently collapsing or fiber disintegrating due to repeated bending, thereby ensuring the morphological stability and durability of the insulation performance of the inner structure during long-term use.

[0019] Option 8: A method for manufacturing a multi-layered composite structure for cold-weather and waterproof footwear as described in any one of embodiments one through seven, comprising the following steps: Step 1: Sew the waterproof leather pieces together to form the outer layer of the shoe upper. Then, apply a flexible waterproof adhesive to the back of the outer layer to cover all the seam gaps and form a waterproof sealant. Step 2: Take the flexible thermal insulation material layer with pressure-sensitive self-adhesive and directly attach it to the back of the outer layer using the pressure-sensitive self-adhesive to form an intermediate layer; Step 3: The multi-layered material, including at least a surface fabric layer, a thermal insulation material layer, and a waterproof and breathable membrane layer, is melted and pressed together without glue using a flame bonding process to form an inner laminate. The flame bonding process refers to stacking the materials and then applying a high-temperature flame to the surface of adjacent layers to slightly melt them, followed by pressing and cooling to achieve adhesion. Step four: Place the inner layer inside the middle layer and adhere it to the middle layer. Then, fix the outer layer, middle layer, inner layer and sole together to obtain the cold-proof and waterproof shoes.

[0020] Using Scheme 8, the manufacturing method of this invention ensures that the needle holes in the seam area are fully filled with waterproof adhesive through a process sequence of sewing first and then applying adhesive; the middle layer is directly bonded using the self-adhesive material itself, eliminating the need for additional adhesive application; the inner layer is flame-bonded to achieve glue-free integrated molding. The entire manufacturing process avoids the extensive use of organic solvent-based adhesives, resulting in a simple and environmentally friendly process. Furthermore, the finished shoe exhibits reliable bonding between layers under dynamic bending conditions, eliminating the risk of adhesive layer cracking.

[0021] Option Nine: Scheme 9, based on Scheme 8, further defines the multi-layered material in step 3, which is melted and pressed together without glue by flame bonding process, as follows from the outside to the inside: finely carved fleece layer, first foam layer, composite thermal insulation layer, second foam layer, knitted fabric layer and waterproof membrane layer, forming a six-layer integrated structure.

[0022] Option nine employs a flame-bonding process, where the foam layer acts as a bridging medium. Under the instantaneous high-temperature flame, the surface of the foam layer slightly melts, achieving physical fusion with adjacent layers. This creates a robust, integrated structure without the need for adhesives. The six-layer integrated laminate is characterized by its strong integrity, soft feel, and ability to withstand repeated bending without delamination.

[0023] Option 10: Scheme 10, based on Scheme 8, further specifies that in step 2, the thickness of the flexible thermal insulation material layer is 0.9 mm, and the pressure-sensitive self-adhesive can be bonded by applying pressure at room temperature.

[0024] Option 10 is adopted, which uses room temperature pressure bonding without the need for heating, simplifying the process and equipment requirements, reducing energy consumption, and avoiding potential damage to the performance of insulation materials caused by high temperature treatment.

[0025] Beneficial effects The present invention provides a multi-layer composite structure for cold-proof and waterproof shoes and its manufacturing method, which have the following advantages compared with the prior art: High dynamic waterproofness: The outer layer is made of waterproof leather, and after stitching, a flexible waterproof adhesive is applied to the entire back. This adhesive continuously covers all stitch holes, effectively blocking the penetration of water. Compared with traditional seam sealing methods, the overall coating on the back creates a large-area continuous coverage between the waterproof layer and the back of the leather. The waterproof adhesive deforms synchronously with the leather during repeated bending without cracking or peeling. Dynamic waterproof testing shows that the cold-weather waterproof shoes of this invention can withstand 60,000 bends without leaking.

[0026] Excellent cold-weather insulation: The middle layer uses a flexible thermal insulation material with self-adhesive pressure sensitivity, and its thickness of only 0.9mm provides a highly efficient thermal barrier; the inner layer, composed of a composite thermal insulation cotton layer made of ultra-fine thermal insulation fiber material, further traps still air, forming a highly efficient thermal insulation layer. The synergistic effect of the double-layer insulation structure allows the temperature inside the shoe to drop by approximately 7°C after being placed in a -30°C environment for 30 minutes (based on simulated foot mold testing).

[0027] The adhesive-free lamination process is environmentally friendly and ensures reliable interlayer bonding: the middle layer uses its own self-adhesive to directly bond to the back of the outer layer, eliminating the need for additional solvent-based adhesives; the inner layer uses a flame-bonding process to melt and press the multiple layers together without adhesive, completely eliminating the use of adhesives. The entire shoe manufacturing process avoids the extensive use of organic solvents, meeting environmental protection requirements, while also eliminating the risk of interlayer separation caused by adhesive aging and cracking, ensuring that the upper maintains its softness and structural integrity over the long term.

[0028] Lightweight and comfortable: The mid-layer is only 0.9mm thick, which greatly reduces the weight of the shoe while achieving efficient insulation; the flame-bonded inner layer eliminates the hardening of the glue layer, and the main body of the shoe upper is soft to the touch, breathable, and comfortable to wear. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main structure of the upper of the multi-layer composite structure cold-proof and waterproof shoe in an embodiment of the present invention; Figure 2 This is a schematic diagram of a multi-layered composite structure for cold-proof and waterproof shoes according to an embodiment of the present invention. Detailed implementation method: To make the technical problems, technical solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are preferred embodiments of the present invention and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and accompanying drawings of this invention is for distinguishing different objects and not for describing a specific order.

[0032] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this invention, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of this invention.

[0033] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this invention should be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection by other means or components.

[0034] In the claims, description and accompanying drawings of this invention, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1-2 The following is a specific embodiment of the present invention: Component Name: Outer layer -100, middle layer -200, inner layer -300.

[0037] Overall structure like Figure 1 As shown in the figure, this embodiment provides a multi-layer composite structure for cold-proof and waterproof shoes, including a sole and an upper body fixedly connected to the sole. The upper body includes an outer layer 100, a middle layer 200, and an inner layer 300 from the outside to the inside. The outer layer 100, the middle layer 200, and the inner layer 300 are stacked and bonded to each other to form the main body of the upper body. The sole (not shown in the figure) is fixedly connected to the bottom edge of the upper body.

[0038] outer structure like Figure 1 As shown, the outer layer 100 includes waterproof leather. The waterproof leather is stitched together to form the shape of the shoe upper, and a waterproof sealing layer is provided on the back side of the waterproof leather. The waterproof sealing layer at least covers the areas of each seam opening.

[0039] Specifically, the waterproof leather is made of top-grain waterproof nubuck leather. The waterproof sealant is a flexible waterproof adhesive layer coated on the back of the waterproof leather, which continuously covers the entire back of the waterproof leather and fills all the needle holes of the seams.

[0040] Intermediate layer structure like Figure 1 As shown, the intermediate layer 200 is disposed inside the outer layer 100. The intermediate layer 200 is a flexible thermal insulation material layer with built-in pressure-sensitive self-adhesive. The intermediate layer 200 is directly bonded to the back of the outer layer 100 by the pressure-sensitive self-adhesive.

[0041] Specifically, the thickness of the flexible thermal insulation material layer is 0.9 mm. The flexible thermal insulation material layer can be a commercially available superimposed nanoporous thermal insulation material (such as superimposed material YW-02 Y-warm). This material is a nanoporous flexible thermal insulation material with its own pressure-sensitive self-adhesive, which can be bonded by applying pressure at room temperature.

[0042] Inner structure like Figure 1 As shown, the inner layer 300 is disposed inside the intermediate layer 200 and is bonded to the intermediate layer 200. The inner layer 300 is a laminate made of multiple layers of materials, including at least a surface fabric layer, a thermal insulation material layer and a waterproof and breathable membrane layer, which are melt-pressed together without glue using a flame bonding process.

[0043] In this embodiment, the inner layer 300 is a laminate formed by bonding six layers of materials together without adhesive using a flame-bonding process. For example... Figure 1 As shown, the six layers of material, from the outside to the inside, are: finely sculpted fleece layer, first foam layer, composite insulation layer, second foam layer, knitted fabric layer, and waterproof membrane layer.

[0044] The inner layer 300 is the outermost layer of the inner layer, and it adheres to the inner side of the middle layer 200. Both the first and second foam layers are elastic foam layers, such as Kiss of Foam. The composite insulation layer is composed of ultra-fine insulating fiber materials, such as a composite layer of self-Quilted B100 and EP80 Thinsulate. The knitted fabric layer is, for example, a Sympatextricot knitted fabric layer. The waterproof membrane layer, the innermost layer of the inner layer 300, comes into contact with the wearer's feet.

[0045] The above six layers of materials are bonded together using a flame bonding process to form a glue-free, melt-bonded structure. The flame bonding process involves stacking the materials and then subjecting the surfaces of adjacent layers (especially the foam layer) to a momentary high-temperature flame to achieve micro-melting. The layers are then pressed together and cooled to achieve bonding, without the need for any adhesives.

[0046] Tongue and lining structure The waterproof and cold-weather shoes of this embodiment also include a tongue and / or a reverse lining. The tongue and / or reverse lining are made of a composite of finely woven fleece and foam. Specifically, the tongue and reverse lining are made of a composite of finely woven fleece and 2mm foam to improve ankle support and comfort.

[0047] Assembly process The following is combined Figure 2 This embodiment describes the manufacturing method of the cold-proof and waterproof shoes.

[0048] like Figure 2 As shown, the first step is to sew the waterproof leather pieces together to form the outer layer of the shoe upper. Then, apply a flexible waterproof adhesive to the back of the outer layer to cover all the seam gaps and form a waterproof sealant.

[0049] Next, proceed to step two: Take a flexible thermal insulation material layer (0.9mm thick) with built-in pressure-sensitive self-adhesive and directly attach it to the back of the outer layer 100 using the pressure-sensitive self-adhesive to form the intermediate layer 200. This bonding can be completed by applying pressure at room temperature.

[0050] Then, proceed to step three: Multiple layers of material, including at least a surface fabric layer, an insulation layer, and a waterproof and breathable membrane layer, are melted and pressed together without adhesive using a flame-bonding process to form an inner 300mm laminate. Specifically, the finely woven fleece layer, the first foam layer, the composite insulation layer, the second foam layer, the knitted fabric layer, and the waterproof membrane layer are sequentially stacked. A momentary high-temperature flame is used to slightly melt the surfaces of adjacent layers, followed by pressing and cooling to form a six-layer integrated structure.

[0051] Finally, proceed to step four: place the inner layer 300 inside the middle layer 200 and adhere it to the middle layer 200, then fix the outer layer 100, middle layer 200, and inner layer 300 to the sole to obtain the cold-proof and waterproof shoes.

[0052] Usage process In use, the wearer slips their foot into the inner layer 300, with the tongue covering the instep and the lining wrapping around the ankle. The waterproof leather and waterproof sealant layer of the outer layer 100 work together to prevent external moisture from seeping in, while the flexible thermal insulation material layer of the middle layer 200 provides the main thermal barrier. The composite insulation cotton layer in the inner layer 300 further traps still air to enhance the insulation effect. When the wearer walks, the upper body repeatedly bends with the foot's movement. Because the waterproof sealant layer of the outer layer 100 is a flexible adhesive layer that covers all seams and needle holes, it can deform synchronously with the leather without cracking. The middle layer 200 is firmly bonded to the outer layer 100 with self-adhesive, eliminating the risk of adhesive layer fatigue. The inner layer 300 has a strong overall structure formed by flame bonding, without adhesive fusion pressing, and the layers will not delaminate due to bending. After dynamic waterproof testing, the cold-proof and waterproof shoes of this embodiment showed no water leakage after 60,000 bends. After a -30°C temperature drop test, the internal temperature of the shoe decreased by approximately 7°C after 30 minutes.

[0053] Alternative solutions In other embodiments, the flexible thermal insulation material layer in the intermediate layer 200 can be made of other thermal insulation materials with self-adhesive properties, such as aerogel composite sheets with built-in pressure-sensitive self-adhesive or self-adhesive insulation felt. The waterproof leather in the outer layer 100 can be replaced with high-density waterproof microfiber leather; as long as it has the property of sealing the back of the seam area after sewing, the same waterproof effect can be achieved. In the flame-bonded structure of the inner layer 300, the first foam layer and the second foam layer can be replaced with microfiber foam, and the knitted fabric layer can be replaced with other knitted fabrics. All of the above alternatives can achieve the inventive objective of this invention.

[0054] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A multi-layered composite structure for cold-proof and waterproof shoes, comprising a sole and an upper body fixedly connected to the sole, characterized in that, The main body of the shoe upper, from the outside in, comprises the following: The outer layer includes waterproof leather, which is stitched together to form the shape of the shoe upper, and a waterproof sealing layer is provided on the back side of the waterproof leather, the waterproof sealing layer covering at least the area of ​​each stitch gap; The intermediate layer is a flexible thermal insulation material layer with built-in pressure-sensitive self-adhesive, which is directly bonded to the back of the outer layer by the pressure-sensitive self-adhesive; and The inner layer is a laminate made of multiple layers of materials, including at least a surface fabric layer, a thermal insulation material layer and a waterproof and breathable membrane layer, which are melted and pressed together without glue using a flame bonding process. The inner layer is disposed inside the intermediate layer and is bonded to the intermediate layer.

2. The multi-layer composite structure cold-proof and waterproof shoe according to claim 1, characterized in that, The waterproof sealing layer is a flexible waterproof adhesive layer coated on the back of the waterproof leather, which continuously covers the entire back of the waterproof leather and fills all the stitch holes.

3. The multi-layer composite structure cold-proof and waterproof shoe according to claim 1, characterized in that, The waterproof leather is top-grain waterproof nubuck leather.

4. The multi-layer composite structure cold-proof and waterproof shoe according to claim 1, characterized in that, The thickness of the flexible thermal insulation material layer is 0.9 mm.

5. The multi-layer composite structure cold-proof and waterproof shoe according to claim 1, characterized in that, The inner layer is a laminate made of six layers of materials melted and pressed together without glue through a flame bonding process. The six layers of materials, from the outside to the inside, are: finely carved fleece layer, first foam layer, composite thermal insulation layer, second foam layer, knitted fabric layer and waterproof membrane layer.

6. The multi-layer composite structure cold-proof and waterproof shoe according to claim 5, characterized in that, The composite insulation layer is composed of ultra-fine insulation fiber material.

7. The multi-layer composite structure cold-proof and waterproof shoe according to claim 5, characterized in that, Both the first foam layer and the second foam layer are elastic foam layers.

8. A method for manufacturing a multi-layered composite structure for cold-proof and waterproof shoes as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Step 1: Sew the waterproof leather pieces together to form the outer layer of the shoe upper. Then, apply a flexible waterproof adhesive to the back of the outer layer to cover all the seam gaps and form a waterproof sealant. Step 2: Take the flexible thermal insulation material layer with pressure-sensitive self-adhesive and directly attach it to the back of the outer layer using the pressure-sensitive self-adhesive to form an intermediate layer; Step 3: The multi-layered material, including at least a surface fabric layer, a thermal insulation material layer, and a waterproof and breathable membrane layer, is melted and pressed together without glue using a flame bonding process to form an inner laminate. The flame bonding process refers to stacking the materials and then applying a high-temperature flame to the surface of adjacent layers to slightly melt them, followed by pressing and cooling to achieve adhesion. Step 4: Place the inner layer inside the middle layer and adhere it to the middle layer. Then, fix the outer layer, middle layer, inner layer and sole together to obtain the cold-proof and waterproof shoes.

9. The method for providing a multi-layered composite structure for cold-proof and waterproof shoes according to claim 8, characterized in that, In step three, the multi-layered material, which is melted and pressed together without glue using a flame bonding process, consists of the following layers from the outside in: a finely carved fleece layer, a first foam layer, a composite insulation layer, a second foam layer, a knitted fabric layer, and a waterproof membrane layer, forming a six-layer integrated structure.

10. The method for providing a multi-layered composite structure for cold-proof and waterproof shoes according to claim 8, characterized in that, In step two, the thickness of the flexible thermal insulation material layer is 0.9 mm, and the pressure-sensitive self-adhesive can be bonded by applying pressure at room temperature.

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