Sole structure for an article of footwear

Abstract

A sole structure for an article of footwear having an upper includes a heel region, a forefoot region, and a midfoot region disposed between the heel region and the forefoot region. The sole structure also includes a fluid-filled chamber including a first barrier layer that cooperates with a second barrier layer to define a first segment extending between a medial side of the sole structure and a lateral side of the sole structure within the forefoot region, a second segment extending between the medial side of the sole structure and the lateral side of the sole structure within the forefoot region, and a web region disposed between and connecting the first segment and the second segment, the first barrier layer being attached to the second barrier layer within the web region.

Description

[0001] This application is a divisional application of invention application No. 201880088433.3, filed on December 12, 2018.

[0002] Cross-references to related applications

[0003] This application is a PCT international application that claims priority to U.S. Provisional Serial No. 62 / 598782, filed on December 14, 2017, the entire disclosure of which is incorporated herein by reference. Technical Field

[0004] This disclosure generally relates to sole structures for footwear articles, and more specifically to sole structures incorporating fluid-filled chambers having multiple segments. Background Technology

[0005] This section provides background information relating to this disclosure, which is not necessarily prior art.

[0006] Footwear typically consists of an upper and a sole structure. The upper can be formed from any suitable material to receive, secure, and support the foot within the sole structure. The upper can be fitted with laces, belts, or other fasteners to adjust the fit around the foot. The lower portion of the upper, closest to the sole surface of the foot, is attached to the sole structure.

[0007] The sole construction typically comprises a layered arrangement extending between the ground and the upper. One layer of the sole construction includes an outsole, which provides abrasion resistance and traction against the ground. The outsole can be formed of rubber or other materials that impart durability and abrasion resistance as well as enhanced traction against the ground. Another layer of the sole construction includes a midsole disposed between the outsole and the upper. The midsole provides cushioning for the foot and may be partially formed of a polymer foam material that elastically compresses under applied loads to cushion the foot by reducing ground reaction forces. Alternatively or additionally, the midsole may incorporate fluid-filled bladders to increase the durability of the sole construction and to cushion the foot by elastically compressing under applied loads to reduce ground reaction forces. The sole construction may also include an insole or insole for enhanced comfort located within a gap near the bottom portion of the upper, and a midsole fabric attached to the upper and disposed between the midsole and the insole or insole.

[0008] Midsoles employing fluid-filled bladders typically comprise a bladder formed by two polymeric barrier layers sealed or bonded together. The fluid-filled bladder is pressurized with a fluid such as air and may incorporate tension members within the bladder to maintain its shape under applied loads, such as during elastic compression during movement. Typically, the bladder's design focuses on balancing foot support with responsive cushioning characteristics, as the bladder elastically compresses under applied loads. Summary of the Invention

[0009] This disclosure relates to a sole structure for footwear articles, the sole structure comprising: a heel region; a forefoot region; a midfoot region disposed between the heel region and the forefoot region; and a sac including a first sac layer cooperating with a second sac layer to define a chamber defining the periphery of the heel region, the chamber having a first segment extending along one of the medial and lateral sides of the sole structure, a second segment extending along the other of the medial and lateral sides of the sole structure, and a third segment extending between the first and second segments and fluidly connected to the first and second segments via a conduit, the first and second segments extending toward each other and engaging with each other at a junction disposed in the midfoot region. The first segment includes a first distal end and the second segment includes a second distal end, the first distal end engaging the second distal end at the junction.

[0010] This disclosure also relates to a footwear article incorporating the sole structure described above.

[0011] This disclosure also relates to a sole structure for footwear articles, the sole structure comprising: a heel region; a forefoot region; a midfoot region disposed between the heel region and the forefoot region; and a bladder including a first bladder layer cooperating with a second bladder layer to define a chamber defining the periphery of the heel region, the chamber having a first segment extending along one of the medial and lateral sides of the sole structure, a second segment extending along the other of the medial and lateral sides of the sole structure, and a third segment extending between the first and second segments and fluidly connected to the first and second segments via a conduit, the first segment extending from one of the medial and lateral sides of the sole structure in a direction toward the other of the medial and lateral sides of the sole structure, and engaging with the second segment at a junction at the other of the medial and lateral sides of the sole structure. The junction is disposed in the midfoot region. The first segment includes a first distal end and the second segment includes a second distal end, the first distal end engaging with the second distal end at the junction.

[0012] This disclosure also relates to a footwear article incorporating the sole structure described above. Attached Figure Description

[0013] The accompanying drawings described herein are for illustrative purposes only for the selected configurations and are not intended to limit the scope of this disclosure.

[0014] Figure 1 This is a side perspective view of footwear according to the principles of the present invention;

[0015] Figure 2 yes Figure 1An exploded view of a footwear item, showing a sole structure having a midsole, a fluid-filled chamber, and an outsole arranged in a layered structure;

[0016] Figure 3 yes Figure 1 A bottom perspective view of footwear, showing the geometry and construction of multiple chambers associated with the fluid-filled bladders of the sole structure;

[0017] Figure 4 It is along Figure 3 The sectional view taken by line 4-4 shows a segment extending in the forefoot region of the sole structure and between the outer side and the inner side of the sole structure, terminating at the distal end.

[0018] Figure 5 It is along Figure 3 The sectional view taken by line 5-5 shows a segment that extends within the forefoot region of the sole structure and between the outer side and the inner side of the sole structure and terminates at the distal end.

[0019] Figure 6 It is along Figure 3 The sectional view taken by line 6-6 shows the segments located in the heel area of ​​the sole structure and separated from each other by the belly area;

[0020] Figure 7 It is along Figure 3 The sectional view taken by line 7-7 shows segments spaced apart along the sole structure and located in the forefoot, midfoot, and heel regions, and separated from each other by the ventral region;

[0021] Figure 8 It is a perspective view of the segment to which the outer sole is attached; and

[0022] Figure 9 yes Figure 1 A bottom perspective view of a footwear item, showing a cushioning support vector defined by fluid-filled bladders in the sole structure.

[0023] Throughout the accompanying drawings, corresponding reference numerals denote the corresponding parts. Detailed Implementation

[0024] The example configuration will now be described more fully with reference to the accompanying drawings. The example configuration is provided so that this disclosure will be thorough and will fully communicate the scope of this disclosure to those skilled in the art. Numerous specific details, such as examples of particular components, devices, and methods, are set forth to provide a thorough understanding of the configuration of this disclosure. It will be apparent to those skilled in the art that specific details are not required, the example configuration may be embodied in many different forms, and these specific details and example configurations should not be construed as limiting the scope of this disclosure.

[0025] The terminology used herein is for the purpose of describing a particular example configuration only and is not intended to be restrictive. As used herein, the singular forms “a,” “an,” and “the” may also be intended to include the plural forms unless the context clearly indicates otherwise. The terms “comprising,” “including,” and “having” are inclusive, thus specifying the presence of pattern features, integers, steps, operations, elements, and / or components, but not excluding the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Unless explicitly identified as an order of execution, the method steps, processes, and operations described herein should not be construed as requiring performance in the specific order discussed or illustrated. Additional or alternative steps may also be employed.

[0026] When an element or layer is described as being “on,” “joined,” “connected,” “attached,” or “linked” to another element or layer, it may be directly on, joined, connected, attached, or linked to that element or layer, or there may be intermediate elements or layers. Conversely, when an element is described as being “directly on,” “directly joined,” “directly connected,” “directly attached,” or “directly linked” to another element or layer, there may be no intermediate elements or layers. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” vs. “directly between,” “adjacent” vs. “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0027] In this document, the terms first, second, third, etc., may be used to describe various elements, components, regions, layers, and / or parts. These elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish individual elements, components, regions, layers, and / or parts. Unless the context clearly indicates otherwise, terms such as “first,” “second,” and other numerical terms do not imply order or sequence. Therefore, without departing from the teachings of the example configuration, the first element, component, region, layer, and / or part discussed below may be referred to as the second element, component, region, layer, and / or part.

[0028] One aspect of this disclosure provides a sole structure for footwear articles. The structure includes a heel region, a forefoot region, and a midfoot region disposed between the heel region and the forefoot region. The structure also includes a pocket comprising a first barrier layer cooperating with a second barrier layer to define a first chamber having a first segment extending along one of the medial and lateral sides of the sole structure, a second segment extending from a first end of the first segment to the other of the medial and lateral sides, a third segment extending from a second end of the first segment to the other of the medial and lateral sides and separated from the second segment, a fourth segment extending along the other of the medial and lateral sides towards the heel region from one of the second and third segments, and a fifth segment extending from the fourth segment towards one of the medial and lateral sides and terminating at a distal end between the medial and lateral sides.

[0029] Embodiments of this disclosure may include one or more of the following optional features. In some embodiments, the fourth segment extends from the second segment, and the fifth segment extends between the second and third segments. Here, the fifth segment may extend parallel to the third segment and may converge with the second segment in a direction from one of the inner and outer sides to one of the inner and outer sides.

[0030] In some configurations, the fourth segment extends from the third segment, and the third segment extends between the second and fifth segments. Here, the fifth segment may converge with the second and third segments in a direction from one of the inner and outer sides to one of the inner and outer sides. Optionally, the distal end of the fifth segment may be tapered in the direction toward the upper.

[0031] In some examples, the first chamber includes a sixth segment that extends toward the heel region from the other of the second and third segments. The first chamber may also include a seventh segment that extends toward one of the medial and lateral sides from the sixth segment and terminates at a distal end between the medial and lateral sides. In this example, a fifth segment may extend between the second and third segments, and the second segment is positioned between the fifth and seventh segments. Optionally, the bladder of the sole structure may include a second chamber surrounding the heel region of the sole structure.

[0032] Another aspect of this disclosure provides a sole structure for footwear articles. The sole structure includes a heel region, a forefoot region including a toe portion, and a midfoot region disposed between the heel region and the forefoot region. The sole structure also includes a bladder comprising a first blocking layer that cooperates with a second blocking layer to define a first chamber having a serpentine shape extending from the inside of the sole structure to the outside of the sole structure in the forefoot region, a second chamber defining the periphery of the heel region, a third chamber formed in the toe portion of the forefoot region, and a ventral region disposed between and connecting the first, second, and third chambers. The first blocking layer is attached to the second blocking layer in the ventral region.

[0033] Embodiments of this disclosure may include one or more of the following optional features. In some configurations, a first chamber is fluidly connected to a second chamber along its inner side via a first conduit, and a third chamber is fluidly connected to the second chamber along its inner side via a second conduit.

[0034] In some examples, the first chamber includes a first segment extending along one of the medial and lateral sides, a second segment extending from a first end of the first segment to the other of the medial and lateral sides, a third segment extending from a second end of the first segment to the other of the medial and lateral sides and separate from the second segment, a fourth segment extending along the other of the medial and lateral sides from one of the second and third segments toward the heel region, and a fifth segment extending from the fourth segment toward one of the medial and lateral sides and terminating at a distal end between the medial and lateral sides. Here, the third chamber may include a fifth segment extending around the toe portion from one of the medial and lateral sides to the other of the medial and lateral sides, and a sixth segment extending from the fifth segment on the other of the medial and lateral sides toward one of the medial and lateral sides. The sixth segment may terminate at a distal end between the medial and lateral sides. Alternatively or additionally, the sixth segment may be parallel to the second segment. The second chamber may also include a fifth segment extending along one of the medial and lateral sides from the midfoot region through the heel region, a sixth segment extending from the first segment in the midfoot region to the other of the medial and lateral sides in the heel region, and a seventh segment extending around the heel region and fluidly connecting the fifth segment to the sixth segment. Here, the seventh segment can be fluidly connected to the fifth segment via the third conduit, and the seventh segment can be fluidly connected to the sixth segment via the fourth conduit.

[0035] In some embodiments, the sole structure also includes an outsole attached to at least one of the first, second, and third chambers and defining a ground-joining surface. In this example, the ventral region may be recessed from the ground-joining surface.

[0036] Reference Figure 1 and 2 Footwear article 10 includes an upper 100, a midsole 200 attached to the upper 100, and an outsole 300 extending between the midsole 200 and the ground. Footwear article 10 may be divided into one or more regions. These regions may include a forefoot region 12, a midfoot region 14, and a heel region 16. The forefoot region 12 may correspond to the toes and joints that connect the metatarsals and phalanges of the foot. The midfoot region 14 may correspond to the arch region of the foot, while the heel region 16 may correspond to the back of the foot, including the calcaneus. Footwear 10 may include a lateral 18 and a medial 20 that correspond to opposite sides of footwear 10 and extend through regions 12, 14, and 16, respectively.

[0037] The upper 100 includes an inner surface defining an internal cavity 102 configured to receive and secure a foot for support on the midsole 200. The upper 100 may be formed of one or more materials stitched or bonded together to form the internal cavity 102. Suitable materials for the upper may include, but are not limited to, mesh, fabric, foam, leather, and synthetic leather. Materials can be selected and positioned to impart durability, breathability, abrasion resistance, flexibility, and comfort.

[0038] In some examples, the upper 100 includes a midsole fabric 104 having a bottom surface 106 opposite to the midsole 200 and an opposing top surface of a footbed 108 defining an internal cavity 102. The midsole fabric 104 can be secured to the upper 100 by stitching or adhesive. Figure 4 As shown, the contour of the footbed 108 can conform to the contour of the bottom surface of the foot (e.g., the sole). Optionally, the upper 100 may also include additional layers, such as an insole 110 or a shoe insert, which may be disposed on the midsole fabric 104 and located within the internal cavity 102 of the upper 100 to accommodate the sole surface of the foot, thereby enhancing the comfort of the footwear article 10. Ankle opening 112 in the heel region 16 provides access to the internal cavity 102. For example, the ankle opening 112 may accommodate the foot to secure it within the cavity 102 and facilitate entry into and exit from the internal cavity 102.

[0039] In some examples, one or more fasteners 114 extend along the upper 100 to adjust the fit of the internal gap 102 around the foot and accommodate foot entry and exit. The upper 100 may include holes 116, such as eyelets, and / or other engagement features, such as fabric or mesh loops receiving the fasteners 114. The fasteners 114 may include shoelaces, belts, cords, hooks and loops, or any other suitable type of fastener. The upper 100 may include a tongue 118 extending between the internal gap 102 and the fasteners 114.

[0040] like Figure 4-7 As shown, the midsole 200 includes a sac 202 defined by an upper blocking layer 204 (hereinafter referred to as "upper layer 204") and a lower blocking layer 206 (hereinafter referred to as "lower layer 206"). The upper layer 204 and the lower layer 206 define the blocking layers for the sac 202 by being joined together during molding or thermoforming and at multiple discrete locations to form a flange 208 extending around the periphery of the midsole 200 and a ventral region 210 extending between the outer side 18 and the inner side 20 of the midsole 200. The flange 208 and the ventral region 210 are disposed close to the upper 100 and are therefore recessed relative to the ground contact surface 304 of the outer sole 300.

[0041] The upper layer 204 of the pouch 202 is opposite to and attached (e.g., joined and bonded) to the bottom surface 106 of the midsole fabric 104 of the upper 100. Additionally, the contour of the upper layer 204 of the pouch 202 may be shaped to conform to the contour of the foot's bottom surface to provide cushioning and support. The upper layer 204 may be formed from one or more polymer materials during a molding or thermoforming process and may include a peripheral edge extending upwards on the periphery of the upper 100. The lower layer 206 of the pouch 202 is disposed on the side of the pouch 202 opposite to the upper layer 204. The lower layer 206 may include a peripheral edge extending upwards toward the upper 100 and engaging with the peripheral edge of the upper layer 204 to form a flange 208. Like the upper layer 204, the lower layer 206 may be formed from the same or different polymer materials during molding or thermoforming.

[0042] In some embodiments, the upper and lower layers 204, 206 are formed by respective mold portions, each defining a respective surface for forming recesses and a clamping surface corresponding to the position where the flange 208 and / or web region 210 is formed when the lower layer 206 and the upper layer 204 are engaged and joined together. In some embodiments, an adhesive bond is used to join the upper layer 204 and the lower layer 206 to form the flange 208 and the web region 210. In other embodiments, the upper layer 204 and the lower layer 206 are joined by thermal bonding to form the flange 208 and the web region 210. In some examples, one or both of the upper layer 204 and the lower layer 206 are heated to a temperature conducive to forming and melting. In some examples, the layers 204, 206 are heated before being placed between their respective molds. In other examples, the molds may be heated to increase the temperature of the layers 204, 206. In some embodiments, the molding process for forming the capsule 202 incorporates a vacuum port within the mold portion to remove air, causing the upper and lower layers 204, 206 to be drawn into contact with their respective mold portions. In other embodiments, a fluid such as air may be injected into the region between the upper layer 204 and the lower layer 206, causing an increase in pressure that leads to the layers 204, 206 bonding to the surfaces of their respective mold portions.

[0043] The midsole 200 may include a polymer foam layer (not shown) disposed between the upper layer 204 of the bladder 202 and the upper 100. Therefore, the optional foam layer of the midsole 200 is an intermediate layer that indirectly attaches the upper layer 204 of the bladder 202 to the upper 100 by bonding the upper layer 204 of the bladder 202 to the lower surface 106 of the upper 100 and / or the midsole fabric 104, thereby securing the midsole 200 and the outsole 300 to the upper 100. Furthermore, the foam layer of the footwear 10 may reduce the extent to which the upper layer 204 extends onto the outer surface of the upper 100, thus increasing the durability of the footwear 10 by reducing the likelihood of the upper layer 204 separating from the upper 100 during long-term use.

[0044] refer to Figure 3 The sac 202 includes one or more chambers 212, 214, and 216. In the example shown, a first chamber 212 extends from the midfoot region 14 to the toe portion of the forefoot region 12, a second chamber 214 extends through the heel region 16, and a third chamber 216 is formed in the toe portion of the forefoot region 12. The second chamber 214 is fluidly connected to the first chamber 212 via a first conduit 220a, and the third chamber 216 is fluidly connected to the first chamber 212 via a second conduit 220b, as described in more detail below.

[0045] Chambers 212, 214, and 216 are each defined by a plurality of segments 218a-218l, which are fluidly connected to each other by one or more conduits 220a-220d. In some embodiments, a lower layer 206 defines the geometry (e.g., thickness, width, and length) of the plurality of segments 218a-218l and conduits 220a-220d. The lower layer 206 and the upper layer 204 may join and combine in multiple discrete regions between the outer side 18 and the inner side 20 of the sac 202 to define the web region 210 and separate portions of each segment 218a-218l and conduit 220a-220d. Thus, each segment 218a-218l and conduit 220a-220d is associated with a region of the upper layer 204 and the lower layer 206 of the sac 202 that is not joined together and is therefore separated from each other to form a corresponding void.

[0046] Flange 208 and web region 210 may cooperate to define and extend around each segment 218a-218l to seal fluid (e.g., air) within segment 218a-218l. In some examples, the area of ​​web region 210 is entirely defined by segments 218a-218l and / or conduits 220a-220c, while other areas of web region 210 are defined by a combination of segments 218a-218l and / or conduits 220a-220c along one of the outer side 18 and the inner side 20, and along the other of the outer side 18 and the inner side 20, and by flange 208. In some configurations, as the midsole 200 rolls along the ground, the area of ​​web region 210 defines a flexural area to facilitate the flexural action of footwear 10. Figure 3 As shown, no part of the web region 210 extends continuously between the outer side 18 and the inner side 20.

[0047] like Figure 4-7As shown, each segment 218a-218l can define a generally tubular cross-sectional shape and its thickness extends substantially perpendicular to the longitudinal axis L of the midsole 200 between the upper layer 204 and the lower layer 206. Thus, the length of each segment 218a-218l is defined by the distance by which the lower layer 206 protrudes from the upper layer 204 in a direction away from the upper 100. At least two segments 218a-218l can define different thicknesses. For example, the thickness of one or more segments 218h-218j disposed in the heel region 16 can be greater than the thickness of one or more segments 218a-218g disposed in the forefoot region 12 or the midfoot region 14. Figure 7 As shown, the thickness of the midsole 200 gradually decreases from the heel area 16 to the forefoot area 12 to provide greater cushioning and absorb larger ground reaction forces, which initially occur in the heel area 16 and decrease as the forefoot area 12 of the midsole 200 rolls to engage with the ground.

[0048] Each of segments 218a-218l and conduits 220a-220d may be filled with pressurized fluid (i.e., gas, liquid) to provide cushioning and stability for the foot during use of footwear 10. In some embodiments, the first portions of the plurality of segments 218a-218l in chambers 212, 214, 216 provide responsive cushioning due to compressibility under applied load, while the second portions of segments 218a-218l in chambers 212, 214, 216 may be configured to provide soft cushioning under applied load. Thus, segments 218a-218l of bladder 202 may be coordinated to provide gradient cushioning for footwear article 10, which changes with the applied load (i.e., the greater the load, the more segments 218a-218l are compressed, thus enabling footwear 10 to respond more quickly).

[0049] In other embodiments, instead of or in addition to pressurized fluid, one or more cushioning materials, such as polymer foam and / or particulate matter, are surrounded by one or more segments 218a-218l to provide cushioning for the foot. In these embodiments, the cushioning material can provide different cushioning properties to one or more segments 218a-218l than to segments 218a-218l filled with pressurized fluid. For example, the cushioning material may be more or less responsive to or provide greater shock absorption than the pressurized fluid.

[0050] In some embodiments, the overmolded portion extends over a portion of the bladder 202 to provide increased durability and resilience to chambers 212, 214, 216 under applied loads. The overmolded portion may extend over the foreleg region 12, middle leg region 14, and / or heel region 16 by attaching to the lower layer 206 to provide enhanced durability and resilience to the bladder 202, wherein there is a large separation distance between the lower layer 206 and the upper layer 204, or to provide increased thickness in specific regions of the bladder 202, such as the heel region 16. In some examples, the overmolded portion is incorporated into the lower layer 206 and includes at least one of a different thickness, different hardness, and different material than the lower layer 206. The overmolded portion may be limited to a region that is only attached to the lower layer 206 and partially defines a segment located in the foreleg, middle leg, and heel regions 12, 14, 16; therefore, the overmolded portion may not be present in the flange 208 and the web region 210. Therefore, the overmolded portion can partially define multiple segments 218a-218l.

[0051] The outsole 300 is attached to and conforms to the midsole 200 in shape. The outsole 300 may include a plurality of ground contact pads 302 for defining the ground contact surface 304 of the footwear article 10. In some examples, the contact pads 302 extend from the lower layer 206 of the pouch 202 in a direction away from the upper 100 to provide increased traction to the ground. The contact pads 302 may also position the sole surface of the foot higher above the ground.

[0052] In some examples, the outer sole 300 includes a ground-engaging surface 304 and an opposing inner surface 306, which is attached to the area of ​​the defined segments 218a-218l of the lower layer 206. Thus, the outer sole 300 may include a plurality of segments, each defining a shape conforming to the shape of the respective segments 218a-218l, thereby eliminating the outer sole 300 in the area between segments 218a-218l, thereby exposing the flange 208 and the ventral region 210 of the bladder 202. The outer sole 300 typically provides abrasion resistance and traction to the ground and may be formed of one or more materials that impart durability and abrasion resistance as well as enhanced traction to the ground. For example, rubber may form at least a portion of the outer sole 300.

[0053] In the example shown, the outer sole 300 is formed as an overmolded portion, as described above. Therefore, the outer sole 300 can be integrally formed with the lower layer 206 of the bladder 202 using an overmolding process. In other examples, the outer sole 300 can be formed separately from the lower layer 206 of the bladder 202 and can be adhesively bonded to the lower layer 206.

[0054] refer to Figure 3Referring to the bottom perspective view of footwear 10, the geometry and construction of segments 218a-218l are shown. At least one segment 218a-218l may have a different length than the other segments 218a-218l. As described above, segments 218a-218l are formed in the upper layer 204 and lower layer 206 of the midsole 200, which are separated from and spaced apart from each other to define corresponding voids for surrounding pressurized fluid or cushioning material. Thus, the flange 208 and the web region 210 correspond to the areas where the upper layer 204 and lower layer 206 of the bladder 202 join and combine, and cooperate to define and define the periphery of each segment 218a-218l, thereby sealing the pressurized fluid therein. Therefore, segments 218a-218l can be disposed within corresponding regions 12, 14, 16 of the midsole 200 and can be spaced apart from each other by the web region 210. In other words, one or more segments 218a-218l can be used to define the corresponding area of ​​the web region 210.

[0055] In some embodiments, at least two of segments 218a-218l extend along the outer side 18 of the midsole 200, while at least two other segments 218a-218l extend along the inner side 20 of the midsole 200. Furthermore, some of segments 218a-218l extend between the outer side 18 and the inner side 20 of the midsole 200. For example, at least one segment 218a-218l may extend continuously from one of the outer side 18 and the inner side 20 to the other. Alternatively or additionally, at least one of segments 218a-218l extends from one of the outer side 18 and the inner side 20 to a distal end 222 terminating between the inner side 20 and the outer side 18. Here, the distal end 222 can be tapered in the direction toward the upper 100, that is, the lower layer 206 is tapered toward the upper layer 204 of the pouch 202, so the thickness of the segments 218a–218l decreases in the direction toward the distal end 222.

[0056] In some embodiments, segments 218a-218l are fluidly connected to each other to form an integral pressure system for the bladder 202. As segments 218a-218l compress or expand, this integral pressure system directs fluid through segments 218a-218l under applied loads to provide cushioning, stability, and support, particularly as the footwear 10 moves forward, by reducing ground reaction forces. Alternatively, one or more segments 218a-218l may be fluidly isolated from other segments 218a-218l, such that at least one segment 218a-218l can be pressurized differently.

[0057] In some configurations, at least two adjacent segments 218a-218l are connected to each other at bends 224 or turns, such that each segment connected by the respective bends 224 extends in different directions from each other. Each bend 224 is associated with an inner radius extending toward the periphery of the midsole 200. In some examples, the radius of each bend 224 is at least 3 mm. Furthermore, each bend 224 is disposed adjacent to the periphery of the midsole 200 on one side of the respective segment 218a-218l opposite to the flange 208. By positioning the bends 224 on one side of the segment opposite the flange 208, collapse of the segments 218a-218l is limited during directional changes between loads applied to the midsole 200.

[0058] like Figure 3 As shown, segments 218a-218g of the first chamber 212 can be fitted to define an overall serpentine shape for the first chamber 212, extending between the distal end 222e of segment 218e located in the forefoot region 12 and the distal end 222g of segment 218g located in the midfoot region 14. More specifically, the overall serpentine shape of the first chamber 212 extends along the longitudinal axis L of the midsole 200 and includes one or more segments 218d, 218f extending along the outer side 18, one or more segments 218c extending along the inner side 20, segments 218a, 218b extending continuously between the outer side 18 and the inner side 20, and segments 218e, 218g extending toward the inner side 20 to a distal end 222, which terminates at a corresponding distal end 222e, 222g between the outer side 18 and the inner side 20.

[0059] In some examples, the first chamber 212 includes a plurality of segments 218a-218g extending from the forefoot region 12 through the midfoot region 14. The first and second segments 218a, 218b are disposed within the forefoot region 12 and extend continuously from the outer side 18 of the midsole 200 to the inner side 20. The second segment 218b is disposed in front of the first segment 218a relative to the longitudinal axis L of the midsole 200. The first segment 218a and the second segment 218b converge to each other in a direction from the outer side 18 to the inner side. A third segment 218c extends along the inner side 20 in the forefoot region 12 and includes a first end fluidly connected to the first segment 218a and a second end fluidly connected to the second segment 218b at a corresponding bend 224 of the first chamber 212. The first chamber 212 also includes a fourth segment 218d extending along the outer side 18 of the midsole 200 from the second segment 218b toward the first segment 218a. A fifth segment 218e is positioned between the first segment 218a and the second segment 218b and extends from the fourth segment 218d. The fifth segment 218e extends from the fourth segment 218d toward the medial side 20 and terminates at a distal end 222e between the lateral side 18 and the medial side 20. In some cases, the fifth segment 218e is substantially parallel to the first segment 218a and converges with the second segment 218b in the direction from the lateral side 18 to the medial side 20. A sixth segment 218f extends from the first segment 218 along the lateral side 18 in a direction away from the second segment 218b (i.e., toward the heel area). In some examples, the sixth segment 218f extends into the midfoot area 14. A seventh segment 218g of the first chamber 212 extends from the sixth segment 218f toward the medial side 18 and terminates at a distal end 222g between the lateral side 18 and the medial side 20. The seventh segment 218g converges with the first segment 218a in the direction from the lateral side 18 to the medial side 20.

[0060] Continue to refer to Figure 3 The second chamber 214 includes an eighth segment 218h that extends from the midfoot region 14 along the medial side 20. A ninth segment 218i includes a first portion extending from the eighth segment 218h on the medial side 20 and across the midsole to the lateral side 18, and a second portion extending laterally through the heel region 16. A tenth segment 218j of the second chamber 214 extends around the heel region 16 from the eighth segment 218h on the medial side 20 to the ninth segment 218i on the lateral side 18. The tenth segment 218j can be fluidly connected to each of the eighth segment 218h and the ninth segment 218i via a third conduit 220c and a fourth conduit 220d, respectively. As described above, each segment 218h-218j of the second chamber 214 and the conduits 220c, 220d can be filled with pressurized fluid to impart desired cushioning and responsiveness. Alternatively, the tenth segment 218j surrounding the heel region 16 may include cushioning material to provide cushioning characteristics different from the pressurized fluid of the eighth and ninth segments 218h, 218i.

[0061] The third chamber 216 includes an eleventh segment 218k extending from the inner side 20 to the outer side 18 around the toe portion of the forefoot region 12. A twelfth segment 218l extends from the eleventh segment 218k at the outer side 18 toward the inner side 20 and terminates at a distal end 222l between the outer side 18 and the inner side. The twelfth segment 218l is substantially parallel to the second segment 218b.

[0062] like Figure 3 , 5 As shown in Figure 8, the distal ends 222e, 222g, 222l of the fifth, seventh, and twelfth segments 218e, 218g, 218l include a compound taper, wherein the thickness T and width of the segment decrease in the direction toward the distal ends 222e, 222g, 222l. The tapered distal ends 222e, 222g, 222l serve as anchor points for the respective segments 218e, 218g, 218l and as anchor points for the entire capsule 202 to maintain its shape when subjected to loads such as shear forces.

[0063] In some examples, segments 218a, 218b, 218e, 218g, 218k, and 218l each extend generally in a direction from the outer side 18 to the inner side 20 and are configured to compress successively as the outer sole 300 rolls to engage with the ground, while the footwear 10 provides cushioning for the foot during running motion. The ventral region 210 separates segments 218a, 218b, 218e, 218g, 218k, and 218l from each other, such that the ventral region 210 defines a flexural region extending from the forefoot region 12 through the midfoot region 14. Furthermore, as described above, each segment 218a, 218b, 218e, 218g, 218k, and 218l is parallel to or converges with each other segment 218a, 218b, 218e, 218g, 218k, and 218l in the direction from the outer side 18 to the inner side 20. The parallel and / or converging arrangement of segments 218a, 218b, 218e, 218g, 218k, and 218l, and the web region 210 separating segments 218a, 218b, 218e, 218g, 218k, and 218l, allow segments 218a, 218b, 218e, 218g, 218k, and 218l to compress under applied load, thereby providing cushioning for the forefoot by reducing ground reaction forces during running motion, while simultaneously suppressing foot oscillation when segments 218a, 218b, 218e, 218g, 218k, and 218l are under compression.

[0064] Figure 4 Provided along Figure 3 The sectional view taken along line 4-4 shows the midsole 200 in the forefoot region 12, wherein the inner sole 110, the midsole fabric 104 of the upper 100, and the upper layer 204 of the bladder 202 are shown as referenced above. Figure 1 and 2The layered structure arrangement is as described above. The outer edge of the lower layer 206 may extend upward toward the upper 100 and engage with the outer edge of the upper layer 204 to form a flange 208 along the inner side 20 and the outer side 18. The lower layer 206 of the pouch 202 may also extend toward the upper 100 and engage with the upper layer 204 to form a region of the ventral region 210 that extends and separates segments 218k and 218l. For example, segment 218k extending along the inner side 20 of the midsole 200 is defined by the ventral region 210 and the flange 208 formed at the inner side 20, while segment 218l extending from the outer side 18 toward the inner side 20 is defined by the ventral region 210 and the flange 208 formed at the outer side 18. The distal end 222l of segment 218l is tapered in the direction toward the upper 100 and terminates in the ventral region 210 formed between the outer side 18 and the inner side 20.

[0065] The outsole 300 is attached to and conforms to each segment 218k, 218l in shape. In some examples, the contact pad 302 extends from the outsole 300 in a direction away from the upper 100 and along the corresponding length of the segments 218k, 218l to provide increased traction to the ground.

[0066] Figure 5 Provided along Figure 3 The sectional view taken along line 5-5 shows the midsole 200 in the forefoot region 12, wherein the inner sole 110, the midsole fabric 104 of the upper 100, and the upper layer 204 of the bladder 202 are shown as referenced above. Figure 1 and 2 The layered structure is arranged as described above. The outer edge of the lower layer 206 may extend upward toward the upper 100 and join with the outer edge of the upper layer 204 to form a flange 208 along the inner side 20 and the outer side 18. The lower layer 206 of the pouch 202 may also extend toward the upper 100 and join with the upper layer 204 to form a region of the ventral region 210 that extends and separates segments 218c and 218e. For example, segment 218c extending along the inner side 20 of the midsole 200 is defined by the ventral region 210 and the flange 208 formed at the inner side 20, while segment 218e extending from the outer side 18 toward the inner side 20 is defined by the ventral region 210 and the flange 208 formed at the outer side 18. The distal end 222e of segment 218e is tapered in the direction toward the upper 100 and terminates in the ventral region 210 formed between the outer side 18 and the inner side 20.

[0067] The outsole 300 is attached to and conforms to each segment 218c, 218d, 218e in shape. In some examples, the contact pad 302 extends from the outsole 300 in a direction away from the upper 100 and along the respective length of segments 218c, 218d, 218e to provide increased traction to the ground.

[0068] Figure 6 Provided along Figure 3 The sectional view taken along line 6-6 shows the midsole 200 in the heel region 14, wherein the inner sole 110, the midsole fabric 104, and the upper layer 204 of the bladder 202 are as described above. Figure 1 and 2 The layered construction arrangement is as described. The outer edge of the lower layer 206 can extend upward toward the upper 100 and join with the outer edge of the upper layer 204 to form a flange 208 along the inner side 20 and the outer side 18. Figure 6 As shown, the lower layer 206 protrudes from the upper layer 204 in a direction away from the upper 100 to define the eighth segment 218h and the conduit 220d extending along the inner side 20 and outer side 18 of the heel region 16, respectively. As shown, the lower layer 206 protrudes a greater distance from the upper layer 204 at the inner side 20 than at the outer side 18. Therefore, the thickness of the conduit 220d formed along the outer side 18 is less than the thickness of the eighth segment 218h, wherein the lower layer 206 is recessed from the grounding surface 304 of the contact pad 302.

[0069] Figure 7 Provided along Figure 3 The sectional view taken along line 7-7 shows the midsole 200 and outsole 300 extending through the heel region 16, midfoot region 14, and forefoot region 12. A second chamber 214 extends along the inner side 20 of the midsole 200 within the heel region 16 and midfoot region 14. (Refer to above) Figure 1 and 2 As described in footwear 10, the outsole 300 is attached to portions of the lower layer 206 in areas of the chambers 212, 214, 216 that protrude away from the upper 100, to provide enhanced durability and elasticity to the fovea 202 in the heel region 16, midfoot region 14, and forefoot region 12. Furthermore, segments 218a, 218b, 218e, 2181i, 218j, 218k, 218l extend between the outer side 18 and the inner side 20. The ventral region 210 can separate and extend segments 218a, 218b, 218e, 2181i, 218j, 218k, 218l, as... Figure 7 As shown. In some examples, segments 218a-218g, 218k, and 218l extend into the forefoot region 12 and have a smaller thickness compared to segments 218h-218j in the heel region 16 and / or the midfoot region 14.

[0070] Figure 8 A bottom perspective view of segments 218b-218e, 218k, and 218l is provided, these segments being fluidly connected to each other and arranged within the forefoot region 12 of the midsole 200. In some examples, segments 218e and 218l extend towards the medial side 20 to distal ends 222e and 222l terminating between the lateral side 18 and the medial side 20. The distal ends 222e and 222l may be tapered in the direction toward the upper 100. The tapering of the distal ends 222e and 222l of segments 218e and 218l can serve as anchoring points for segments 218e and 218l under applied loads, as described above.

[0071] Figure 9 Provided Figure 1 A bottom perspective view of the footwear article 10 shows a plurality of cushioning support vectors 30a-30l defined by segments 218a-218l. More specifically, the longitudinal axis of each segment 218a-218l defines a corresponding cushioning support vector 30a-30l. An applied load, associated with a direction parallel to the cushioning support vector, causes one or more corresponding segments to substantially maintain their shape without collapsing, thereby providing support and stability for the foot in those areas. On the other hand, an applied load, associated with a direction transverse to the cushioning support vector, causes one or more corresponding segments to compress and collapse, thereby providing cushioning for the foot in those areas by reducing the ground reaction force associated with the applied load. The longitudinal cushioning support vectors 30c, 30d, 30f, and 30h may extend along the longitudinal axis L of the midsole 200, while the transverse cushioning support vectors 30a, 30b, 30e, 30j, and 30l extend transversely to the longitudinal axis L of the midsole 200. For example, the lateral cushioning support vectors 30a, 30b, 30e, 30j, and 30l can be defined at an angle within 15 degrees (15°) perpendicular to the longitudinal axis L relative to the midsole 200. The seventh, ninth, tenth, and eleventh segments 218g, 218i-218k respectively define the composite cushioning support vectors 30g and 30i. 1,2 30j 1,2 30k 1,2 This provides responsive support along the longitudinal and lateral directions of the midsole 200 by angled and / or flexed segments 218g, 218i-218k.

[0072] During forward movements such as walking or running, the load applied to the midsole 200 is related to the direction parallel to the longitudinal cushioning support vectors 30c, 30d, 30f, and 30h, so that the segments 218c, 218d, 218f, and 218h are under shear force. This causes the segments 218c, 218d, 218f, and 218h to roll with the outsole to maintain their shape (e.g., not compress) and provide support and stability by engaging with the ground through the heel region 16 and the midfoot region 14. The ventral region 210 extending between the segments 218c, 218d, 218f, and 218h reduces the torsional force acting on the segments 218c, 218d, 218f, and 218h under the applied load, thereby damping foot oscillations while providing gradient-responsive cushioning.

[0073] During lateral movements such as displacement or cutting motions, the load applied to the midsole 200 is related to the direction of the lateral and generally perpendicular to the longitudinal cushioning support vectors 30c, 30d, 30f, and 30h. Therefore, when the applied load is directed toward the medial side 20 of the midsole 200, segments 218c and 218h defining one of the vectors 30c and 30h will compress to provide cushioning to the medial side of the foot, while when the applied load is directed toward the lateral side 18 of the midsole 200, segments 218d and 218f defining the other vectors 30d and 30f will compress to provide cushioning to the lateral side of the foot.

[0074] In some embodiments, a series of lateral cushioning support vectors 30c, 30d, 30f, and 30h are disposed within the midfoot region 14 and the forefoot region 12, and extend substantially parallel to each other in a direction transverse to the longitudinal axis L of the midsole 200. During forward movement, such as walking or running, the load applied to the midsole 200 is related to the direction transverse to the lateral cushioning support vectors 30c, 30d, 30f, and 30h. Therefore, corresponding segments 218c, 218d, 218f, and 218h defining the respective vectors 30c, 30d, 30f, and 30h successively compress and collapse to provide cushioning for the metatarsal region of the foot by pushing away from the ground. The directional indicators of the vectors 30c, 30d, 30f, and 30h relative to the direction of the applied load and the lengths of the corresponding segments 218c, 218d, 218f, and 218h indicate how the segments will compress to reduce ground reaction forces.

[0075] During lateral movements, such as displacement or cutting motions, the load applied to the midsole 200 is related to a direction generally parallel to or only slightly transverse to the lateral cushioning support vectors 30c, 30d, 30f, 30h, to cause the corresponding segments 218c, 218d, 218f, 218h to be under shear force, thereby allowing the corresponding segments 218c, 218d, 218f, 218h to maintain their shape (e.g., not compressed or slightly compressed) and provide support and stability to the metatarsal region of the foot in response to lateral movements performed by the footwear 10. Reference Figure 3 The distal ends 222 of segments 218e, 218g, and 218l can each be tapered in the direction toward the upper 100 and serve as anchor points for the bladder 202 as a whole.

[0076] As described above, the midsole 200 further defines a series of composite cushioning support vectors 30g, 30j-30l, each configured to provide a certain degree of longitudinal cushioning and responsiveness as well as lateral cushioning and responsiveness, thereby complementing the lateral cushioning support vectors 30c, 30d, 30f, 30h and the longitudinal cushioning support vectors 30c, 30d, 30f, 30h.

[0077] Segments 218a-218l associated with chambers 212, 214, and 216 can work together to enhance the functionality and cushioning properties provided by the midsole, while providing enhanced stability and support to the foot by attenuating foot oscillations in response to ground reaction forces during use of footwear 10. For example, during forward movements such as walking or running, the load applied to the midsole 200 may cause some segments 218a-218l to compress to provide cushioning to the foot by reducing ground reaction forces, while other segments 218a-218l can maintain their shape to impart stability and support properties, thereby attenuating foot oscillations relative to footwear 10 in response to the initial impact of ground reaction forces.

[0078] Furthermore, one or more segments 218a-218l may interact with the ventral region 210 within different regions 12, 14, 16 of the midsole 200 to provide a responsive cushioning isolation zone. For example, segments 218h-218j within the heel region 16 may define corresponding portions of the ventral region 210 to provide responsive cushioning in the heel region 16 by causing segments 218h-218j surrounding the periphery of the heel region 16 to generate a trampoline effect as segments 218j-218j are continuously compressed, thereby absorbing the initial impact of ground reaction forces and thus providing gradient responsive cushioning in the heel region 16. Segments 218j-218j may cooperate with each other to surround a portion of the ventral region 210 at the heel region 16, thereby causing that portion of the ventral region 210 to act as a trampoline during use to absorb forces associated with heel impact.

[0079] Additionally, as the outsole 300 rolls to engage with the ground from the heel area 16 to the forefoot area 12, and during lateral movements as the outsole 300 rolls to engage with the ground from one of the outer 18 and the inner 20 to the other of the outer 18 and the inner 20, segments 218a-218l, along with the geometry and positioning of the midsole 200, can enhance the traction between the outsole 300 and the ground.

[0080] The following terms provide an exemplary construction of the aforementioned footwear items.

[0081] Clause 1: A sole structure for footwear articles having an upper, the sole structure comprising: a heel region; a forefoot region; a midfoot region disposed between the heel region and the forefoot region; and a pocket comprising a first blocking layer cooperating with a second blocking layer to define a first chamber having a first segment extending along one of the medial side and the lateral side of the sole structure; a second segment extending from a first end of the first segment to the other of the medial side and the lateral side; a third segment extending from a second end of the first segment to the other of the medial side and the lateral side and separated from the second segment; a fourth segment extending along the other of the medial side and the lateral side towards the heel region from one of the second segment and the third segment; and a fifth segment extending from the fourth segment towards one of the medial side and the lateral side and terminating at a distal end between the medial side and the lateral side.

[0082] Clause 2: The sole structure as described in Clause 1, wherein the fourth segment extends from the second segment and the fifth segment extends between the second and third segments.

[0083] Clause 3: The sole structure as described in Clause 2, wherein the fifth segment extends parallel to the third segment and converges with the second segment in a direction from one of the inner and outer sides to one of the inner and outer sides.

[0084] Clause 4: The sole structure as described in Clause 1, wherein the fourth segment extends from the third segment, and the third segment extends between the second and fifth segments.

[0085] Clause 5: The sole structure as described in Clause 4, wherein the fifth segment converges with the second and third segments in a direction from one of the inner and outer sides to one of the inner and outer sides.

[0086] Clause 6: The sole structure as described in Clause 1, wherein the distal end of the fifth segment is tapered in the direction toward the upper.

[0087] Clause 7: The sole structure as described in Clause 1, wherein the first chamber further includes a sixth segment that extends toward the heel area from another of the second and third segments.

[0088] Clause 8: The sole structure as described in Clause 7, wherein the first chamber further includes a seventh segment that extends from the sixth segment toward one of the medial and lateral sides and terminates at a distal end between the medial and lateral sides.

[0089] Clause 9: The sole structure as described in Clause 8, wherein the fifth segment extends between the second and third segments, and the second segment is positioned between the fifth and seventh segments.

[0090] Clause 10: The sole structure as described in Clause 1, wherein the bladder further includes a second chamber surrounding the heel region of the sole structure.

[0091] Clause 11: A sole structure for footwear articles having an upper, the sole structure comprising: a heel region; a forefoot region including a toe portion; a midfoot region disposed between the heel region and the forefoot region; and a bladder including a first blocking layer cooperating with a second blocking layer to define a first chamber having a serpentine shape extending from the inside of the sole structure to the outside of the sole structure in the forefoot region, a second chamber defining the periphery of the heel region, a third chamber formed in the toe portion of the forefoot region, and a ventral region disposed between and connecting the first, second, and third chambers, the first blocking layer being attached to the second blocking layer in the ventral region.

[0092] Clause 12: The sole structure according to Clause 11, wherein the first chamber is fluidly connected to the second chamber along the inner side via a first conduit, and the third chamber is fluidly connected to the second chamber along the inner side via a second conduit.

[0093] Clause 13: The sole structure according to Clause 11, wherein the first chamber comprises a first segment extending along one of the medial and lateral sides, a second segment extending from a first end of the first segment to the other of the medial and lateral sides, a third segment extending from a second end of the first segment to the other of the medial and lateral sides and separate from the second segment, a fourth segment extending along the other of the medial and lateral sides towards the heel area from one of the second and third segments, and a fifth segment extending from the fourth segment towards one of the medial and lateral sides and terminating at a distal end between the medial and lateral sides.

[0094] Clause 14: The sole structure according to Clause 13, wherein the third chamber includes a fifth segment extending around the toe portion from one of the medial and lateral sides to the other of the medial and lateral sides, and a sixth segment extending from the fifth segment on the other of the medial and lateral sides toward one of the medial and lateral sides.

[0095] Clause 15: The sole structure as described in Clause 14, wherein the sixth segment terminates at the distal end between the medial and lateral sides.

[0096] Clause 16: The sole construction as described in Clause 14, wherein the sixth segment is parallel to the second segment.

[0097] Clause 17: The sole structure according to Clause 13, wherein the second chamber includes a fifth segment extending from the midfoot region along one of the medial and lateral sides through the heel region, a sixth segment extending from the first segment in the midfoot region to the other of the medial and lateral sides in the heel region, and a seventh segment extending around the heel region and fluidly connecting the fifth segment to the sixth segment.

[0098] Clause 18: The sole structure as described in Clause 17, wherein the seventh segment is fluidly connected to the fifth segment via a third conduit, and the seventh segment is fluidly connected to the sixth segment via a fourth conduit.

[0099] Clause 19: The sole structure according to Clause 11 further includes an outsole attached to at least one of the first chamber, the second chamber, and the third chamber and defining a ground contact surface.

[0100] Clause 20: The sole structure as described in Clause 19, wherein the ventral region is recessed from the surface in contact with the ground.

[0101] The foregoing description has been provided for purposes of illustration and description. It is not intended to be exhaustive or limiting of this disclosure. The various elements or features of a particular configuration are generally not limited to that particular configuration, but are interchangeable where applicable, and may be used in a selected configuration even if not specifically shown or described. Variations are also possible in many ways. Such variations should not be considered a departure from this disclosure, and all such modifications are intended to be included within the scope of this disclosure.

Claims

1. A sole structure for footwear articles, the sole structure comprising: Heel area; Forefoot area; The midfoot area is located between the heel area and the forefoot area; and The bladder includes a first bladder layer that cooperates with a second bladder layer to define a chamber defining the periphery of a heel region. The chamber has a first segment extending along one of the medial and lateral sides of the sole structure, a second segment extending along the other of the medial and lateral sides of the sole structure, and a third segment extending between the first and second segments and fluidly connected to them via a conduit. The first and second segments extend toward each other and engage with each other at a junction located in the midfoot region. Wherein, the first segment includes a first distal end and the second segment includes a second distal end, wherein the first distal end is engaged to the second distal end at the junction.

2. The sole structure according to claim 1, wherein, The first segment is arched and extends from the outside of the sole structure to the first distal end.

3. The sole structure according to claim 2, wherein, The first segment extends from the heel region to the first distal end in a direction toward the inside of the sole structure.

4. The sole structure according to claim 1, wherein, The first segment extends from the heel region to the first distal end, and the second segment extends from the heel region to the second distal end.

5. The sole structure according to claim 1, wherein, The third segment is bow-shaped.

6. The sole structure according to claim 1, wherein, The third segment extends along the rear end of the sole structure within the heel area.

7. The sole structure according to claim 1, wherein, The first segment, the second segment, and the third segment work together to define a closed loop in the heel area.

8. A footwear article incorporating the sole structure according to claim 1.

9. A sole structure for footwear articles, the sole structure comprising: Heel area; Forefoot area; The midfoot area is located between the heel area and the forefoot area; and The bladder includes a first bladder layer that cooperates with a second bladder layer to define a chamber defining the periphery of a heel region. The chamber has a first segment extending along one of the medial and lateral sides of the sole structure, a second segment extending along the other of the medial and lateral sides of the sole structure, and a third segment extending between the first and second segments and fluidly connected to them via a conduit. The first segment extends from one of the medial and lateral sides of the sole structure in a direction toward the other of the medial and lateral sides of the sole structure, and joins the second segment at a junction on the other of the medial and lateral sides of the sole structure. The joint is located in the middle foot area. Wherein, the first segment includes a first distal end and the second segment includes a second distal end, wherein the first distal end is engaged to the second distal end at the junction.

10. The sole structure according to claim 9, wherein, The first segment is arched and extends from the outside of the sole structure to the first distal end.

11. The sole structure according to claim 9, wherein, The first segment extends from the heel region to the first distal end, and the second segment extends from the heel region to the second distal end.

12. The sole structure according to claim 9, wherein, The third segment is bow-shaped.

13. The sole structure according to claim 9, wherein, The third segment extends along the rear end of the sole structure within the heel area.

14. The sole structure according to claim 9, wherein, The first segment, the second segment, and the third segment work together to define a closed loop in the heel area.

15. A footwear article incorporating the sole structure according to claim 9.

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