Footwear

Abstract

To provide a piece of footwear that has functionality suitable depending on usage.SOLUTION: The footbed of a piece of footwear 1A includes a buffer part SA composed of a three-dimensional mesh structure body in which a unit structure is repeatedly arranged in plurality so as to be next to each other. In certain aspects, the space factor of the buffer part SA is larger than an outer foot side forefoot B in an inner foot side forefoot A, larger than an outer foot side middle foot part D in an inner foot side middle foot part C, larger than an outer foot side rear foot part F in an inner foot side rear foot part E, smaller than the inner foot side middle foot part C in the inner foot side forefoot A, smaller than the outer foot side middle foot part D in the outer foot side forefoot B, equal to or smaller than the inner foot side rear foot part E in the inner foot side middle foot part C, and equal to or smaller than the outer foot side rear foot part F in the outer foot side middle foot part D.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present disclosure relates to footwear. [Background technology]

[0002] In recent years, all or part of the soles and insoles of footwear have been constructed from objects fabricated by three-dimensional additive manufacturing. For example, Japanese Patent Laid-Open Publication No. 2018-187363 (Patent Document 1) and U.S. Patent Publication No. 2018 / 0049514 (Patent Document 2) disclose shoes including soles fabricated by three-dimensional additive manufacturing, and U.S. Patent Application Publication No. 2018 / 0228401 (Patent Document 3) discloses an insole fabricated by three-dimensional additive manufacturing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-187363 A [Patent Document 2] US Patent Publication No. 2018 / 0049514 [Patent Document 3] US Patent Application Publication No. 2018 / 0228401 Summary of the Invention [Problem to be solved by the invention]

[0004] In general, footwear is required to have a wide variety of functions depending on its use. For example, the performance required for footwear used for running, which involves many kicking-off and landing movements, is significantly different from that required for footwear used for specific ball games, such as tennis and basketball, which involve many turning movements in the left and right directions. Furthermore, even for footwear used for running, the performance required for running is significantly different depending on whether the running style is a heel-strike or mid-foot running style or a forefoot running style.

[0005] In this regard, if soles and insoles are manufactured by three-dimensional additive manufacturing, it becomes possible to make various structural improvements to the soles and insoles based on the high degree of design freedom, and it becomes possible to provide high-performance footwear having functions suited to various uses. However, as far as the inventors know, there is still a lack of footwear equipped with soles and insoles that have been improved based on such perspectives.

[0006] Therefore, the present disclosure has been made in consideration of the above-mentioned points, and makes it possible to provide footwear having functionality that is more suitable for the intended use. [Means for solving the problem]

[0007] The footwear according to the present disclosure is provided with a footbed that supports the sole of a wearer's foot and includes a ground contact surface. The footbed includes a forefoot portion that supports the toes and plantar part of the wearer's foot, a midfoot portion that supports the arch of the wearer's foot, and a rearfoot portion that supports the heel of the wearer's foot, and the forefoot portion, midfoot portion, and rearfoot portion are positioned in a continuous manner along the front-rear direction of the footwear. The forefoot portion includes an inner forefoot portion and an outer forefoot portion that are defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface. The midfoot portion includes an inner midfoot portion and an outer midfoot portion that are defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface. The rearfoot portion includes an inner rearfoot portion and an outer rearfoot portion that are defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface. The footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and is made of a three-dimensional mesh structure in which unit structures are repeatedly arranged adjacent to each other.

[0008] In the footwear according to the first aspect of the present disclosure, a volume factor of the cushioning portion at a portion located at the medial forefoot portion is greater than a volume factor of the cushioning portion at a portion located at the lateral forefoot portion, a volume factor of the cushioning portion at a portion located at the medial midfoot portion is greater than a volume factor of the cushioning portion at a portion located at the lateral midfoot portion, a volume factor of the cushioning portion at a portion located at the medial rear foot portion is greater than a volume factor of the cushioning portion at the lateral rear foot portion, and a volume factor of the cushioning portion at the medial forefoot portion is greater than a volume factor of the cushioning portion at a portion located at the medial forefoot portion. the space factor of the buffer portion located in the medial midfoot portion is smaller than the space factor of the buffer portion located in the medial forefoot portion, the space factor of the buffer portion located in the medial midfoot portion is smaller than the space factor of the buffer portion located in the medial rearfoot portion, and the space factor of the buffer portion located in the medial midfoot portion is equal to or smaller than the space factor of the buffer portion located in the medial rearfoot portion.

[0009] In the footwear according to a second aspect of the present disclosure, a volume factor of the cushioning portion at a portion located at the medial forefoot portion is greater than a volume factor of the cushioning portion at a portion located at the lateral forefoot portion, a volume factor of the cushioning portion at a portion located at the medial midfoot portion is greater than a volume factor of the cushioning portion at a portion located at the lateral midfoot portion, a volume factor of the cushioning portion at a portion located at the medial rearfoot portion is greater than a volume factor of the cushioning portion at the lateral rearfoot portion, and a volume factor of the cushioning portion at the medial forefoot portion is greater than a volume factor of the cushioning portion at a portion located at the medial forefoot portion. the space factor of the cushioning part in the portion located in the medial midfoot part is equal to or greater than the space factor of the cushioning part in the portion located in the medial forefoot part, the space factor of the cushioning part in the portion located in the medial midfoot part is equal to or greater than the space factor of the cushioning part in the portion located in the medial rearfoot part, and the space factor of the cushioning part in the medial midfoot part is greater than the space factor of the cushioning part in the medial rearfoot part.

[0010] In footwear according to a third aspect of the present disclosure, a volume factor of the cushioning portion at a portion located at the medial forefoot portion is smaller than a volume factor of the cushioning portion at a portion located at the lateral forefoot portion, a volume factor of the cushioning portion at a portion located at the medial midfoot portion is smaller than a volume factor of the cushioning portion at a portion located at the lateral midfoot portion, a volume factor of the cushioning portion at a portion located at the medial rear foot portion is smaller than a volume factor of the cushioning portion at the lateral rear foot portion, and a volume factor of the cushioning portion at the medial forefoot portion is smaller than a volume factor of the cushioning portion at a portion located at the medial forefoot portion. the space factor of the buffer part of the portion located in the medial midfoot part is smaller than the space factor of the buffer part of the portion located in the medial forefoot part, the space factor of the buffer part of the portion located in the medial midfoot part is smaller than the space factor of the buffer part of the portion located in the medial rearfoot part, and the space factor of the buffer part of the portion located in the medial midfoot part is equal to or smaller than the space factor of the buffer part of the portion located in the medial rearfoot part.

[0011] In footwear according to a fourth aspect of the present disclosure, a volume factor of the cushioning portion at a portion located at the medial forefoot portion is smaller than a volume factor of the cushioning portion at a portion located at the lateral forefoot portion, a volume factor of the cushioning portion at a portion located at the medial midfoot portion is smaller than a volume factor of the cushioning portion at a portion located at the lateral midfoot portion, a volume factor of the cushioning portion at a portion located at the medial rear foot portion is smaller than a volume factor of the cushioning portion at the lateral rear foot portion, and a volume factor of the cushioning portion at the medial forefoot portion is smaller than a volume factor of the cushioning portion at a portion located at the medial forefoot portion. the space factor of the buffer portion located in the portion of the outer foot side forefoot is equal to or greater than the space factor of the buffer portion located in the portion of the outer foot side midfoot, the space factor of the buffer portion located in the portion of the inner foot side midfoot is greater than the space factor of the buffer portion located in the portion of the inner foot side rear foot, and the space factor of the buffer portion located in the portion of the outer foot side midfoot is greater than the space factor of the buffer portion located in the portion of the outer foot side rear foot. Effect of the Invention

[0012] According to the present disclosure, it is possible to provide footwear having functionality more suited to the intended use. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is an exploded view of the footwear according to the first embodiment. [Diagram 2] 2 is a perspective view of the insole shown in FIG. 1, seen from the upper right front side. [Diagram 3] 2 is a perspective view of the insole shown in FIG. 1, seen from the left diagonally lower rear side. [Figure 4] FIG. 2 is a plan view of the insole shown in FIG. [Diagram 5] 2 is a side view of the insole shown in FIG. 1 as viewed from the outside of the foot. [Figure 6] 6 is a partially cutaway perspective view of the insole shown in FIG. 1 taken along the line VI-VI shown in FIGS. 2, 4 and 5. FIG. [Figure 7] 2 is a schematic diagram for explaining the three-dimensional structure of the base layer of the insole shown in FIG. 1. FIG. [Figure 8] FIG. 2 is a schematic bottom view for explaining the space factor distribution of the insole according to the first configuration example. [Figure 9] FIG. 11 is a schematic bottom view for explaining the space factor distribution of the insole according to the second configuration example. [Figure 10] FIG. 13 is a schematic bottom view for explaining the space factor distribution of the insole according to the third configuration example. [Figure 11] FIG. 13 is a schematic bottom view for explaining the space factor distribution of the insole according to the fourth configuration example. [Figure 12] FIG. 13 is a schematic diagram for explaining the three-dimensional structure of a base layer of an insole provided in footwear according to a first modified example. [Figure 13] FIG. 11 is a schematic diagram for explaining the three-dimensional structure of a base layer of an insole provided in footwear according to a second modified example. [Figure 14] FIG. 11 is a perspective view of footwear according to a second embodiment. [Figure 15] FIG. 11 is a perspective view of footwear according to a third embodiment. [Figure 16] 16 is a schematic cross-sectional view taken along line XVI-XVI shown in FIG. 15. [Figure 17] FIG. 16 is an exploded view of the footwear shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference characters in the drawings, and the description thereof will not be repeated.

[0015] <Embodiment 1> FIG. 1 is an exploded view of the footwear according to the first embodiment, and FIG. 2 and FIG. 3 are perspective views of the insole shown in FIG. 1 as viewed from the upper right front side and the lower left rear side, respectively. FIG. 4 is a plan view of the insole shown in FIG. 1, and FIG. 5 is a side view of the insole shown in FIG. 1 as viewed from the outside of the foot. FIG. 6 is a partially cutaway perspective view of the insole shown in FIG. 1 taken along the line VI-VI shown in FIG. 2, FIG. 4, and FIG. 5, and FIG. 7 is a schematic diagram for explaining the three-dimensional structure of the base layer of the insole shown in FIG. 1. First, the schematic configuration of the footwear 1A according to the present embodiment and the insole 20A included therein will be explained with reference to FIG. 1 to FIG. 7.

[0016] As shown in Fig. 1, footwear 1A includes a shoe body 10 and an insole 20A. The shoe body 10 includes a sole 11 and an upper 14 located above the sole 11. The sole 11 has a generally flat shape, and the upper 14 has a bag-like shape that covers the wearer's foot except for the sole. The insole 20A has a generally flat shape, and is inserted inside the shoe body 10.

[0017] The sole 11 includes a midsole 12A and an outsole 13, and the outsole 13 is fixed to the lower surface of the midsole 12A by, for example, adhesion. The lower surface of the outsole 13 constitutes a ground contact surface 15, and the midsole 12A is a part that mainly supports the wearer's foot. The midsole 12A is preferably excellent in shock-absorbing properties and may be made of, for example, a resin foam material. The outsole 13 is preferably excellent in abrasion resistance and grip, and may be made of, for example, a rubber member.

[0018] The upper 14 has an opening 16 at its top into which the wearer's foot is inserted, and a space is formed inside into which the wearer's foot is inserted when the shoe is worn. The lower end of the upper 14 is fixed to the upper surface of the midsole 12A, for example, by adhesion. The upper 14 is made of, for example, woven fabric, knitted fabric, nonwoven fabric, synthetic leather, resin, etc., and for shoes that require particular breathability and light weight, a double raschel warp knit fabric made of woven polyester yarn is used.

[0019] The insole 20A is inserted into the shoe body 10 through the above-mentioned opening 16 provided in the upper 14. As a result, the insole 20A is placed on the inner bottom surface of the shoe body 10 with its bottom surface facing the inner bottom surface, and the insole 20A is attached to the shoe body 10. When the insole 20A is attached to the shoe body 10, the upper surface of the insole 20A forms a support surface that supports the sole of the wearer's foot.

[0020] When a wearer puts on the footwear 1A, the sole of the wearer's foot is supported by the sole 11 serving as a footbed and the insole 20A. At this time, the insole 20A is sandwiched between the sole 11 of the shoe body 10 and the sole of the wearer's foot.

[0021] 2 to 5, the insole 20A has a generally flat shape, and its outer shape in a plan view generally matches the outer shape of the inner bottom surface of the shoe body 10. The insole 20A is made of a single member, and is a shaped object produced by a three-dimensional additive manufacturing method. For example, a photolithography method is used as the three-dimensional additive manufacturing method.

[0022] In Fig. 4, the outline of the shoe body 10 (i.e., the outline of the footwear 1A) in a state in which the insole 20A is attached to the shoe body 10 is indicated by a two-dot chain line. As shown in Fig. 4, the footbed consisting of the sole 11 and the insole 20A is divided into a forefoot portion R1 supporting the toes and plantar portion of the wearer's foot, a midfoot portion R2 supporting the arch of the wearer's foot, and a rearfoot portion R3 supporting the heel of the wearer's foot along the front-rear direction (the up-down direction in Fig. 4) that coincides with the longitudinal direction of the wearer's foot.

[0023] Here, if the front end of the footbed is taken as a reference point, a position corresponding to 40% of the front-to-back dimension of the footbed from the front end is taken as the first boundary position, and a position corresponding to 70% of the front-to-back dimension of the footbed from the front end is taken as the second boundary position, then the forefoot portion R1 corresponds to the portion between the front end and the first boundary position along the front-to-back direction, the midfoot portion R2 corresponds to the portion between the first boundary position and the second boundary position along the front-to-back direction, and the rear foot portion R3 corresponds to the portion between the second boundary position and the rear end of the sole along the front-to-back direction.

[0024] In addition, the footbed is divided along the left-right direction (left-right direction in Figure 4), which is the direction that matches the width direction of the wearer's foot when viewed in a plane, into an inner foot side portion (the S1 side portion shown in Figure 4), which is the midline side (i.e. the side closer to the midline) of the anatomical orthogonal position of the foot, and an outer foot side portion (the S2 side portion shown in Figure 4), which is the opposite side of the midline side of the anatomical orthogonal position of the foot (i.e. the side farther from the midline).

[0025] Here, the boundary line dividing the footbed into an inner part and an outer part is the so-called shoe center SC. This shoe center SC is a straight line obtained by projecting a straight line connecting the part between the first and second toes of a standard wearer having a foot size suitable for the footwear 1A and the center part of the calcaneus (the so-called heel center (the heel center is indicated by the symbol HC in Fig. 4 and other figures)) onto the footbed in the up-down direction when the wearer wears the footwear 1A. The front end and rear end of the footbed described above are the ends of the footbed located on this shoe center SC.

[0026] Furthermore, the vertical direction of the insole 20A described later means the direction that corresponds to the thickness direction of the insole 20A, which has a flat shape (i.e., the vertical direction in Figure 5), and more specifically, it is a direction perpendicular to both the front-to-back direction, which is the direction that corresponds to the length direction of the wearer's foot as described above, and the left-to-right direction, which is the direction that corresponds to the width direction of the wearer's foot as described above.

[0027] Here, the part included in the forefoot R1 and on the inner side is referred to as the inner forefoot, which is indicated by the symbol A in Fig. 4, and the part included in the forefoot R1 and on the outer side is referred to as the outer forefoot, which is indicated by the symbol B in Fig. 4. Similarly, the part included in the midfoot R2 and on the inner side is referred to as the inner midfoot, which is indicated by the symbol C in Fig. 4, and the part included in the midfoot R2 and on the outer side is referred to as the outer midfoot, which is indicated by the symbol D in Fig. 4. Similarly, the part included in the rearfoot R3 and on the inner side is referred to as the inner rearfoot, which is indicated by the symbol E in Fig. 4, and the part included in the rearfoot R3 and on the outer side is referred to as the outer rearfoot, which is indicated by the symbol F in Fig. 4.

[0028] As shown in Figures 2 to 6, the insole 20A includes a base layer 21 and an upper layer 22, each of which is configured to form a layer. The base layer 21 includes an upper surface 21a (see Figure 6 in particular) and a lower surface 21b, and constitutes the lower portion of the insole 20A. The upper layer 22 includes an upper surface 22a and a lower surface 22b (see Figure 6 in particular), and constitutes the upper portion of the insole 20A by covering the upper surface 21a of the base layer 21. In other words, the insole 20A has a two-layer structure consisting of the base layer 21 and the upper layer 22.

[0029] As described above, since the insole 20A is made of a single member, the upper surface 21a of the base layer 21 and the lower surface 22b of the upper layer 22 are configured to be continuous with each other. In other words, the upper surface 21a of the base layer 21 and the lower surface 22b of the upper layer 22 refer to the boundary surface where the structural difference between the base layer 21 and the upper layer 22, which will be described later, occurs.

[0030] 7, the base layer 21 is composed of a three-dimensional mesh structure 2A in which a plurality of unit structures 3A, each of which has a three-dimensional lattice structure, are repeatedly arranged so as to be adjacent to each other. Here, in the insole 20A provided in the footwear 1A according to the present embodiment, the unit structures 3A are repeatedly and continuously arranged along three orthogonal axial directions, and thus a large number of holes are provided inside the base layer 21 and on its outer surface.

[0031] More specifically, the multiple unit structures 3A are regularly and continuously repeatedly arranged along the width direction (X direction in the figure), depth direction (Y direction in the figure), and height direction (Z direction in the figure). In Fig. 7, only three unit structures 3A adjacent to each other in the width direction, depth direction, and height direction are shown, and their fracture surfaces are shaded dark.

[0032] The unit structure 3A, which is a three-dimensional lattice structure, has a three-dimensional shape in which a plurality of columns extending in a predetermined direction are connected to each other. As the unit structure 3A, various structures can be used, such as a rectangular parallelepiped lattice, a diamond lattice, an octahedral lattice, a double pyramidal lattice, a fluorite lattice, or structures in which various supports are added to these lattices. The unit structure 3A shown in the figure is a rectangular parallelepiped lattice with a central support added.

[0033] When the base layer 21 of the insole 20A is made of the three-dimensional mesh structure 2A as described above, it is preferable to distort each unit structure 3A as necessary so that the external shape of the three-dimensional mesh structure 2A matches the external shape of the insole 20A. In this way, the outer surface of the insole 20A can be made smooth.

[0034] As shown in Figures 2 to 6, by disposing the base layer 21 configured as above in the lower part of the insole 20A, the base layer 21 functions as a shock-absorbing part SA having high deformation ability as a whole. By providing the shock-absorbing part SA made of the three-dimensional mesh structure 2A in the insole 20A in this way, it is possible to give the insole 20A high deformation ability, so that the insole can be made to have excellent shock-absorbing performance and comfortable wear, and can also be made to have improved stability when worn. In addition, since the base layer 21 has the above configuration, the insole can be made lightweight compared to its size, and can also be made to have excellent breathability.

[0035] The lower surface 21b of the base layer 21 is disposed so as to face the inner bottom surface of the shoe body 10 when the insole 20A is attached to the shoe body 10. The lower surface 21b of the base layer 21 has an uneven shape due to the provision of the numerous holes described above, but is generally flat when viewed as a whole. Here, the lower surface 21b of the base layer 21 may further be provided with a symbol or design part such as a letter, a logo, a pattern, or an authentication identification code by molding, as necessary.

[0036] 2 to 6, the upper layer 22 is made of a sheet-like structure. The upper layer 22 made of the sheet-like structure has a plurality of holes 22c penetrating the upper layer 22 in its thickness direction (i.e., the vertical direction of the insole 20A). Each of the plurality of holes 22c is exposed on the upper surface 22a of the upper layer 22, and faces the base layer 21 on the lower surface 22b of the upper layer 22. Therefore, most of the plurality of holes 22c communicate with holes provided on the inside and outer surface of the base layer 21 at the boundary between the upper layer 22 and the base layer 21.

[0037] The upper surface 22a of the upper layer 22 is configured so that the portion corresponding to the forefoot R1 has a generally flat shape as a whole, and the portions corresponding to the midfoot R2 and rearfoot R3 have a generally concave shape as a whole, so that the upper surface 22a of the upper layer 22 fits the sole of the wearer's foot. Although the upper surface 22a of the upper layer 22 has a plurality of holes 22c as described above, it has a smooth shape as a whole.

[0038] By disposing the upper layer 22 constructed as described above in the upper portion of the insole 20A, the base layer 21, which has numerous holes on its internal and external surfaces and thus has numerous fine irregularities formed on its upper surface 21a, is covered by the upper layer 22, and the upper surface of the insole 20A, which is the part that comes into contact with the sole of the user's foot, is formed by the smoothly formed upper surface 22a of the upper layer 22 made of a sheet-like structure, making it possible to provide an insole that not only feels good on the foot and is comfortable to wear, but also has excellent breathability.

[0039] Moreover, by disposing the upper layer 22 thus constructed in the upper portion of the insole 20A, the contact area with the sole of the wearer's foot is increased, and the insole is more stable when worn and can effectively disperse foot pressure. Furthermore, the base layer 21 made of the three-dimensional mesh structure 2A is protected by the upper layer 22, and the insole is more durable.

[0040] The material of the insole 20A is not particularly limited, but is preferably a resin material or a rubber material so as to have appropriate flexibility, extensibility, durability, elasticity, stability, etc. More specifically, when the insole 20A is made of resin, it can be, for example, polyolefin resin, ethylene-vinyl acetate copolymer (EVA), polyamide thermoplastic elastomer (TPA, TPAE), thermoplastic polyurethane (TPU), or polyester thermoplastic elastomer (TPEE). On the other hand, when the insole 20A is made of rubber, it can be, for example, butadiene rubber (BR).

[0041] The insole 20A may be made of a polymer composition. In this case, examples of the polymer contained in the polymer composition include olefin-based polymers such as olefin-based elastomers and olefin-based resins. Examples of olefin-based polymers include polyethylene (e.g., linear low-density polyethylene (LLDPE), high-density polyethylene (HDPE), etc.), polypropylene, ethylene-propylene copolymers, propylene-1-hexene copolymers, propylene-4-methyl-1-pentene copolymers, propylene-1-butene copolymers, ethylene-1-hexene copolymers, ethylene-4-methyl-pentene copolymers, ethylene-1-butene copolymers, 1-butene-1-hexene copolymers, 1-butene-4-methyl-pentene, ethylene-methacrylic acid copolymers, ethylene-methyl methacrylate copolymers, ethylene- Examples of the polyolefin include ethyl methacrylate copolymer, ethylene-butyl methacrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, propylene-methacrylic acid copolymer, propylene-methyl methacrylate copolymer, propylene-ethyl methacrylate copolymer, propylene-butyl methacrylate copolymer, propylene-methyl acrylate copolymer, propylene-ethyl acrylate copolymer, propylene-butyl acrylate copolymer, ethylene-vinyl acetate copolymer, and propylene-vinyl acetate copolymer.

[0042] The polymer may be an amide-based polymer such as an amide-based elastomer or an amide-based resin, etc. Examples of the amide-based polymer include polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 610, etc.

[0043] The polymer may be an ester-based polymer such as an ester-based elastomer or an ester-based resin, etc. Examples of the ester-based polymer include polyethylene terephthalate and polybutylene terephthalate.

[0044] The polymer may be a urethane-based polymer such as a urethane-based elastomer or a urethane-based resin, etc. Examples of the urethane-based polymer include polyester-based polyurethane and polyether-based polyurethane.

[0045] The polymer may be a styrene-based polymer such as a styrene-based elastomer or a styrene-based resin. Examples of the styrene-based elastomer include styrene-ethylene-butylene copolymer (SEB), styrene-butadiene-styrene copolymer (SBS), hydrogenated SBS (styrene-ethylene-butylene-styrene copolymer (SEBS)), styrene-isoprene-styrene copolymer (SIS), hydrogenated SIS (styrene-ethylene-propylene-styrene copolymer (SEPS)), styrene-isobutylene-styrene copolymer (SIBS), styrene-butadiene-styrene-butadiene (SBSB), and styrene-butadiene-styrene-butadiene-styrene (SBSBS). Examples of the styrene-based resin include polystyrene, acrylonitrile styrene resin (AS), and acrylonitrile butadiene styrene resin (ABS).

[0046] The polymer may be, for example, an acrylic polymer such as polymethyl methacrylate, a urethane-based acrylic polymer, a polyester-based acrylic polymer, a polyether-based acrylic polymer, a polycarbonate-based acrylic polymer, an epoxy-based acrylic polymer, a conjugated diene polymer-based acrylic polymer and a hydrogenated product thereof, a urethane-based methacrylic polymer, a polyester-based methacrylic polymer, a polyether-based methacrylic polymer, a polycarbonate-based methacrylic polymer, a polyester-based urethane acrylate, a polycarbonate-based urethane acrylate, a polyether-based urethane acrylate, an epoxy-based methacrylic polymer, a conjugated diene polymer-based methacrylic polymer and a hydrogenated product thereof, a polyvinyl chloride resin, a silicone-based elastomer, butadiene rubber, isoprene rubber (IR), chloroprene rubber (CR), natural rubber (NR), styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), butyl rubber (IIR), or the like.

[0047] As described above, it is preferable that the insole 20A is made of a flexible material, and therefore, among the above-mentioned materials, it is particularly preferable that the insole 20A is made of urethane acrylate. When the insole 20A is made of urethane acrylate, it not only has excellent durability and elongation, but also has sufficient elasticity. As described above, the insole 20A is manufactured by a three-dimensional additive manufacturing method such as a photolithography method, and therefore the insole 20A may contain a hardener as a secondary component.

[0048] In the footwear 1A according to this embodiment, the insole 20A is illustrated as being configured to include a base layer 21 including a cushioning portion SA made of a three-dimensional mesh structure 2A, and an upper layer 22 made of a sheet structure covering the base layer 21. However, the upper layer 22 is not necessarily required, and the insole 20A may be configured only with the base layer 21 including the cushioning portion SA made of the three-dimensional mesh structure 2A.

[0049] As described above, in the footwear 1A according to the present embodiment, the insole 20A, which is placed on the sole 11 of the shoe body 10 when used, includes a shock-absorbing part SA made of a three-dimensional mesh structure 2A. Since this shock-absorbing part SA can be manufactured by three-dimensional additive manufacturing as described above, the high degree of freedom in design allows various improvements to be made to the insole 20A in terms of structure. In this regard, in the footwear 1A according to the present embodiment, the insole 20 can be configured, for example, as in the insoles 20A1 to 20A3 according to the first to third configuration examples shown below, depending on the use of the footwear 1A.

[0050] Here, the space factor in the buffer section SA, which will be described later, represents the ratio of the volume of solid parts (i.e. parts that are not holes (hollow parts)) per given volume of the three-dimensional mesh structure 2A, and generally, parts with a high space factor have high rigidity, while parts with a low space factor have low rigidity. Note that the specific size of the space factor in the buffer section SA is not particularly limited, but is generally 5% or more and 80% or less, and parts with high rigidity have a space factor of 30% or more (35% or more in some cases), and parts with low rigidity have a space factor of less than 30% (25% or less in some cases).

[0051] As a method for varying the space factor for each portion of the buffer section SA as described below, it is possible to assume that the size of the unit structure 3A described above is changed for each portion of the buffer section SA, the thickness of the pillars of the unit structure 3A is changed for each portion of the buffer section SA, or the structure of the unit structure 3A itself is changed for each portion of the buffer section SA. Of these, in order to vary the space factor for each portion of the buffer section SA without deteriorating the foot contact, it is particularly effective to configure the buffer section SA so that the size of the unit structure 3A gradually changes.

[0052] The space factor can be calculated by measuring the specific gravity of the material constituting the three-dimensional mesh structure 2A, cutting out portions from the three-dimensional mesh structure 2A corresponding to the medial forefoot, lateral forefoot, medial midfoot, lateral midfoot, medial rearfoot, and lateral rearfoot in this disclosure, and measuring the volume (including the solid and hollow portions mentioned above) and weight of each cut-out portion, and then calculating the space factor from these specific gravity, volume, and weight.

[0053] (First configuration example) Fig. 8 is a schematic bottom view for explaining the space factor distribution of the insole according to the first configuration example. Hereinafter, the insole 20A1 according to the first configuration example will be explained with reference to Fig. 8. The footwear 1A provided with the insole 20A1 is a running shoe designed for running with a heel-strike running style or a mid-foot running style, for example.

[0054] In running shoes designed for running with a heel-strike or midfoot running style, there is a particular need for high stability for the inner part of the wearer's foot when landing in order to prevent overpronation, and high support for the part of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch in order to prevent fatigue accumulation and injury associated with the heel touching the ground.

[0055] Here, in order to provide high stability to the medial part of the wearer's foot when landing, it is effective to increase the rigidity of the medial part of the footbed more than the rigidity of the lateral part, and in order to provide high support for the part of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch, it is effective to increase the rigidity of the midfoot section R2 and rearfoot section R3 of the footbed.

[0056] In this regard, as shown in FIG. 8, in an insole 20A1 according to a first configuration example, a shock absorbing section SA made of a three-dimensional mesh structure 2A is configured so as to satisfy the following conditions 1-1 to 1-7.

[0057] Condition 1-1: The space factor of the cushioning portion SA located in the medial forefoot part A is greater than the space factor of the cushioning portion SA located in the lateral forefoot part B. Condition 1-2: The space factor of the cushioning portion SA located in the midfoot part C on the medial side of the foot is greater than the space factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot. Condition 1-3: The space factor of the cushioning portion SA located in the inner rear foot part E is greater than the space factor of the cushioning portion SA located in the outer rear foot part F. Condition 1-4: The space factor of the cushioning portion SA in the portion located in the medial forefoot portion A is smaller than the space factor of the cushioning portion SA in the portion located in the medial midfoot portion C. Condition 1-5: The space factor of the cushioning portion SA in the portion located in the lateral forefoot portion B is smaller than the space factor of the cushioning portion SA in the portion located in the lateral midfoot portion D. Condition 1-6: The space factor of the buffer portion SA in the portion located in the medial midfoot part C of the foot is equal to or smaller than the space factor of the buffer portion SA in the portion located in the medial rearfoot part E of the foot. Condition 1-7: The volume factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot is equal to or smaller than the volume factor of the cushioning portion SA located in the rearfoot part F on the lateral side of the foot.

[0058] In FIG. 8, the space factor distribution along the shoe center SC is shown in the graph on the left side of the figure, and the space factor distribution along a line 100 shown in the figure that is perpendicular to the shoe center SC and passes through the heel center HC is shown in the graph on the lower side of the figure.

[0059] By configuring the cushioning section SA so as to satisfy conditions 1-1 to 1-3, it is possible to increase the rigidity of the part of the footbed on the inner side of the foot more than the rigidity of the part on the outer side of the foot. Therefore, by configuring the footwear 1A so as to satisfy conditions 1-1 to 1-3, it is possible to provide footwear that provides high stability to the part of the inner side of the wearer's foot when landing.

[0060] Furthermore, by configuring the buffer section SA so as to satisfy conditions 1-4 through 1-7, it becomes possible to increase the rigidity of the midfoot section R2 and rearfoot section R3 more than the rigidity of the forefoot section R1 of the footbed, and to make the rigidity of the rearfoot section R3 of the footbed equal to or greater than the rigidity of the midfoot section R2. Therefore, by configuring the footwear 1A so as to satisfy conditions 1-4 through 1-7, it becomes possible to provide footwear that achieves a high retention function for the portion of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch.

[0061] Therefore, by configuring footwear 1A so as to satisfy the above-mentioned conditions 1-1 to 1-7, it can be made footwear that is particularly suitable for heel-strike and mid-foot running styles.

[0062] Here, in order to provide a clearer functional difference between the midfoot portion R2 and the rearfoot portion R3, the volume factor of the cushioning portion SA located in the medial midfoot portion C may be made smaller than the volume factor of the cushioning portion SA located in the medial rearfoot portion E, and the volume factor of the cushioning portion SA located in the lateral midfoot portion D may be made smaller than the volume factor of the cushioning portion SA located in the lateral rearfoot portion F.

[0063] From the viewpoint of preventing deterioration of foot contact, it is preferable to configure the buffer section SA so that the stiffness does not change significantly locally, and for that purpose, it is preferable to configure the buffer section SA so that the space factor changes gradually, as shown in the graph in Fig. 8. Also, from the viewpoint of improving the fit to the wearer's foot and enabling stable support, it is preferable to increase the stiffness of the peripheral edge of the buffer section SA, as shown in the graph in Fig. 8.

[0064] (Second configuration example) Fig. 9 is a schematic bottom view for explaining the space factor distribution of the insole according to the second configuration example. Hereinafter, the insole 20A2 according to the second configuration example will be explained with reference to Fig. 9. The footwear 1A provided with the insole 20A2 is, for example, a running shoe designed for running with a forefoot running style.

[0065] In running shoes designed for running with a forefoot running style, what is particularly required is high stability for the inner part of the wearer's foot when landing in order to prevent so-called overpronation, efficient transmission of the push-off force from the toes of the wearer's foot to the ground in order to improve propulsion when pushing off, high retention of the medial longitudinal arch and lateral longitudinal arch of the wearer's foot in order to prevent fatigue accumulation and injury, and high cushioning for the heel of the wearer's foot when landing in order to absorb shock.

[0066] Here, in order to provide high stability to the medial part of the wearer's foot when landing, it is effective to make the rigidity of the medial part of the footbed greater than the rigidity of the lateral part; in order to provide high support for the medial longitudinal arch and lateral longitudinal arch of the wearer's foot while efficiently transmitting the push-off force of the toes of the wearer's foot to the ground, it is effective to increase the rigidity of the forefoot part R1 and midfoot part R2 of the footbed; and in order to provide high cushioning to the heel of the wearer's foot when landing, it is effective not to increase the rigidity of the rear foot part R3 far more than the rigidity of the forefoot part R1 and midfoot part R2 of the footbed.

[0067] In this regard, as shown in FIG. 9, in an insole 20A2 according to a second configuration example, a shock absorbing section SA made of a three-dimensional mesh structure 2A is configured so as to satisfy the following conditions 2-1 to 2-7.

[0068] Condition 2-1: The space factor of the cushioning portion SA located in the forefoot part A on the medial side of the foot is greater than the space factor of the cushioning portion SA located in the forefoot part B on the lateral side of the foot. Condition 2-2: The space factor of the cushioning portion SA located in the midfoot part C on the medial side of the foot is greater than the space factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot. Condition 2-3: The space factor of the cushioning portion SA located in the inner rear foot part E is greater than the space factor of the cushioning portion SA located in the outer rear foot part F. Condition 2-4: The space factor of the cushioning portion SA in the portion located in the medial forefoot portion A is equal to or greater than the space factor of the cushioning portion SA in the portion located in the medial midfoot portion C. Condition 2-5: The space factor of the cushioning portion SA located in the outer forefoot part B is equal to or greater than the space factor of the cushioning portion SA located in the outer midfoot part D. Condition 2-6: The space factor of the cushioning portion SA located in the midfoot part C on the medial side of the foot is greater than the space factor of the cushioning portion SA located in the rearfoot part E on the medial side of the foot. Condition 2-7: The space factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot is greater than the space factor of the cushioning portion SA located in the rearfoot part F on the lateral side of the foot.

[0069] In FIG. 9, the space factor distribution along the shoe center SC is shown in the graph on the left side of the figure, and the space factor distribution along a line 100 shown in the figure that is perpendicular to the shoe center SC and passes through the heel center HC is shown in the graph on the lower side of the figure.

[0070] By configuring the cushioning section SA so as to satisfy conditions 2-1 to 2-3, it is possible to increase the rigidity of the part of the footbed on the inner side of the foot more than the rigidity of the part on the outer side of the foot. Therefore, by configuring the footwear 1A so as to satisfy conditions 2-1 to 2-3, it is possible to provide footwear that provides high stability to the part of the inner side of the wearer's foot when landing.

[0071] Furthermore, by configuring the buffer section SA so as to satisfy conditions 2-4 to 2-7, it is possible to increase the rigidity of the forefoot section R1 and midfoot section R2 of the footbed, while preventing the rigidity of the rearfoot section R3 from being extremely higher than the rigidity of the forefoot section R1 and midfoot section R2 of the footbed. Therefore, by configuring the footwear 1A so as to satisfy conditions 2-4 to 2-7, it is possible to provide footwear that efficiently transmits the push-off force of the toes of the wearer's foot to the ground, and that provides a high retention function for the medial longitudinal arch and lateral longitudinal arch of the wearer's foot, while providing high cushioning to the heel of the wearer's foot when landing.

[0072] Therefore, by configuring footwear 1A so as to satisfy the above-mentioned conditions 2-1 to 2-7, it can be made footwear that is particularly suited to the forefoot running style.

[0073] Here, in order to provide a clearer functional difference between the forefoot portion R1 and the midfoot portion R2, the volume factor of the cushioning portion SA located in the forefoot portion A on the medial side of the foot may be made greater than the volume factor of the cushioning portion SA located in the midfoot portion C on the medial side of the foot, and the volume factor of the cushioning portion SA located in the forefoot portion B on the lateral side of the foot may be made greater than the volume factor of the cushioning portion SA located in the midfoot portion D on the lateral side of the foot.

[0074] From the viewpoint of preventing deterioration of foot contact, it is preferable to configure the buffer section SA so that the stiffness does not change significantly locally, and for that purpose, it is preferable to configure the buffer section SA so that the space factor changes gradually, as shown in the graph in Fig. 9. Also, from the viewpoint of improving the fit to the wearer's foot and enabling stable support, it is preferable to increase the stiffness of the peripheral edge of the buffer section SA, as shown in the graph in Fig. 9.

[0075] (Third configuration example) Fig. 10 is a schematic bottom view for explaining the space factor distribution of the insole according to the third configuration example. Hereinafter, the insole 20A3 according to the third configuration example will be explained with reference to Fig. 10. The footwear 1A provided with the insole 20A3 is a shoe used for a specific ball game such as tennis.

[0076] Shoes used for certain ball games, such as tennis, involve a lot of turning movements in the left and right direction, so there is a particular demand for high stability for the outer part of the wearer's foot during turning movements, and high support function for the part of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch in order to prevent fatigue accumulation and injury associated with the heel touching the ground.

[0077] Here, in order to provide high stability to the outer side of the wearer's foot during turning movements, it is effective to increase the rigidity of the outer side of the footbed more than the rigidity of the inner side of the footbed, and in order to provide high support for the portion of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch, it is effective to increase the rigidity of the midfoot portion R2 and rearfoot portion R3 of the footbed.

[0078] In this regard, as shown in FIG. 10, in an insole 20A3 according to a third configuration example, a shock absorbing portion SA made of a three-dimensional mesh structure 2A is configured so as to satisfy the following conditions 3-1 to 3-7.

[0079] Condition 3-1: The space factor of the cushioning portion SA located in the forefoot part A on the medial side of the foot is smaller than the space factor of the cushioning portion SA located in the forefoot part B on the lateral side of the foot. Condition 3-2: The space factor of the cushioning portion SA in the portion located in the midfoot part C on the medial side of the foot is smaller than the space factor of the cushioning portion SA in the portion located in the midfoot part D on the lateral side of the foot. Condition 3-3: The space factor of the cushioning portion SA located in the inner rear foot part E is smaller than the space factor of the cushioning portion SA located in the outer rear foot part F. Condition 3-4: The space factor of the cushioning portion SA in the portion located in the medial forefoot portion A is smaller than the space factor of the cushioning portion SA in the portion located in the medial midfoot portion C. Condition 3-5: The space factor of the cushioning portion SA in the portion located in the lateral forefoot portion B is smaller than the space factor of the cushioning portion SA in the portion located in the lateral midfoot portion D. Condition 3-6: The space factor of the buffer portion SA in the portion located in the medial midfoot part C of the foot is equal to or smaller than the space factor of the buffer portion SA in the portion located in the medial rearfoot part E of the foot. Condition 3-7: The volume factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot is equal to or smaller than the volume factor of the cushioning portion SA located in the rearfoot part F on the lateral side of the foot.

[0080] In FIG. 10, the space factor distribution along the shoe center SC is shown in the graph on the left side of the figure, and the space factor distribution along a line 100 shown in the figure that is perpendicular to the shoe center SC and passes through the heel center HC is shown in the graph on the lower side of the figure.

[0081] By configuring the cushioning section SA so as to satisfy conditions 3-1 to 3-3, it is possible to increase the rigidity of the outer foot side portion of the footbed more than the rigidity of the inner foot side portion. Therefore, by configuring the footwear 1A so as to satisfy conditions 3-1 to 3-3, it is possible to provide footwear that provides high stability to the outer foot side portion of the wearer's foot during turning movements.

[0082] Furthermore, by configuring the buffer section SA so as to satisfy conditions 3-4 to 3-7, it becomes possible to increase the rigidity of the midfoot section R2 and rearfoot section R3 of the footbed more than the rigidity of the forefoot section R1, and to make the rigidity of the rearfoot section R3 of the footbed equal to or greater than the rigidity of the midfoot section R2. Therefore, by configuring the footwear 1A so as to satisfy conditions 3-4 to 3-7, it becomes possible to provide footwear that achieves a high retention function for the portion of the wearer's foot from the heel to the medial longitudinal arch and lateral longitudinal arch.

[0083] Therefore, by configuring footwear 1A so as to satisfy the above-mentioned conditions 3-1 to 3-7, it is possible to make the footwear particularly suitable for specific ball games such as tennis, which involve a lot of turning movements in the left and right directions and a lot of contact with the ground from the heel.

[0084] Here, in order to provide a clearer functional difference between the midfoot portion R2 and the rearfoot portion R3, the volume factor of the cushioning portion SA located in the medial midfoot portion C may be made smaller than the volume factor of the cushioning portion SA located in the medial rearfoot portion E, and the volume factor of the cushioning portion SA located in the lateral midfoot portion D may be made smaller than the volume factor of the cushioning portion SA located in the lateral rearfoot portion F.

[0085] From the viewpoint of preventing deterioration of foot contact, it is preferable to configure the buffer section SA so that the stiffness does not change significantly locally, and for that purpose, it is preferable to configure the buffer section SA so that the space factor changes gradually, as shown in the graph in Fig. 10. Also, from the viewpoint of improving the fit to the wearer's foot and enabling stable support, it is preferable to increase the stiffness of the peripheral edge of the buffer section SA, as shown in the graph in Fig. 10.

[0086] (Fourth configuration example) Fig. 11 is a schematic bottom view for explaining the space factor distribution of the insole according to the fourth configuration example. Hereinafter, the insole 20A4 according to the fourth configuration example will be explained with reference to Fig. 11. The footwear 1A provided with the insole 20A4 is a shoe used for a specific ball game such as table tennis or basketball.

[0087] Shoes used for certain ball games, such as table tennis and basketball, involve a lot of turning movements in the left and right direction, so there is a particular demand for shoes to provide high stability to the outer part of the wearer's foot during turning movements, and to efficiently transmit the kicking force from the toes and foot pad to the ground in order to improve propulsion when pushing off.

[0088] Here, in order to provide high stability to the outer side of the wearer's foot during a turning motion, it is effective to make the rigidity of the outer side of the footbed greater than the rigidity of the inner side of the foot, and in order to achieve an efficient transmission of the push-off force from the toes and footrest of the wearer's foot to the ground, it is effective to increase the rigidity of the forefoot portion R1 and midfoot portion R2 of the footbed.

[0089] In this regard, as shown in FIG. 11, in an insole 20A4 according to a fourth configuration example, a shock absorbing portion SA made of a three-dimensional mesh structure 2A is configured so as to satisfy the following conditions 4-1 to 4-7.

[0090] Condition 4-1: The space factor of the cushioning portion SA located in the forefoot part A on the medial side of the foot is smaller than the space factor of the cushioning portion SA located in the forefoot part B on the lateral side of the foot. Condition 4-2: The space factor of the cushioning portion SA located in the midfoot part C on the medial side of the foot is smaller than the space factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot. Condition 4-3: The space factor of the buffer portion SA located in the inner rear foot part E is smaller than the space factor of the buffer portion SA located in the outer rear foot part F. Condition 4-4: The space factor of the cushioning portion SA in the portion located in the medial forefoot portion A is equal to or greater than the space factor of the cushioning portion SA in the portion located in the medial midfoot portion C. Condition 4-5: The volume factor of the cushioning portion SA located in the outer forefoot part B is equal to or greater than the volume factor of the cushioning portion SA located in the outer midfoot part D. Condition 4-6: The space factor of the cushioning portion SA located in the medial midfoot part C is greater than the space factor of the cushioning portion SA located in the medial rearfoot part E. Condition 4-7: The space factor of the cushioning portion SA located in the midfoot part D on the lateral side of the foot is greater than the space factor of the cushioning portion SA located in the rearfoot part F on the lateral side of the foot.

[0091] In FIG. 11, the space factor distribution along the shoe center SC is shown in the graph on the left side of the figure, and the space factor distribution along a line 100 shown in the figure that is perpendicular to the shoe center SC and passes through the heel center HC is shown in the graph on the lower side of the figure.

[0092] By configuring the cushioning section SA so as to satisfy conditions 4-1 to 4-3, it is possible to increase the rigidity of the outer foot side portion of the footbed more than the rigidity of the inner foot side portion. Therefore, by configuring the footwear 1A so as to satisfy conditions 4-1 to 4-3, it is possible to provide footwear that provides high stability to the outer foot side portion of the wearer's foot during turning movements.

[0093] Furthermore, by configuring the cushioning section SA so as to satisfy conditions 4-4 through 4-7, it is possible to make the rigidity of the forefoot section R1 of the footbed equal to or greater than that of the midfoot section R2, and to make the rigidity of the midfoot section R2 of the footbed greater than that of the rearfoot section R3. Therefore, by configuring the footwear 1A so as to satisfy conditions 4-4 through 4-7, it is possible to obtain footwear that efficiently transmits the push-off force of the toes and footrest of the wearer's foot to the ground.

[0094] Therefore, by configuring footwear 1A to satisfy the above-mentioned conditions 4-1 to 4-7, it is possible to make the footwear particularly suitable for specific ball games, such as table tennis and basketball, which involve frequent turning movements in the left and right directions and require the exertion of kicking power from the toes and footbed.

[0095] Here, in order to provide a clearer functional difference between the forefoot portion R1 and the midfoot portion R2, the volume factor of the cushioning portion SA located in the forefoot portion A on the medial side of the foot may be made greater than the volume factor of the cushioning portion SA located in the midfoot portion C on the medial side of the foot, and the volume factor of the cushioning portion SA located in the forefoot portion B on the lateral side of the foot may be made greater than the volume factor of the cushioning portion SA located in the midfoot portion D on the lateral side of the foot.

[0096] From the viewpoint of preventing deterioration of foot contact, it is preferable to configure the buffer section SA so that the stiffness does not change significantly locally, and for that purpose, it is preferable to configure the buffer section SA so that the space factor changes gradually, as shown in the graph in Fig. 11. Also, from the viewpoint of improving the fit to the wearer's foot and enabling stable support, it is preferable to increase the stiffness of the peripheral edge of the buffer section SA, as shown in the graph in Fig. 11.

[0097] As described above, by configuring footwear 1A according to this embodiment, it is possible to provide footwear having functionality suited to the intended use.

[0098] The space factor distribution in the thickness direction of the buffer section SA is assumed to be either of the following first and second patterns.

[0099] The first mode is a mode in which the space factor of the portion of the buffer section SA on the ground surface 15 side (i.e., the lower side) is made larger than the space factor of the portion of the buffer section SA on the opposite side (i.e., the upper side) from the ground surface 15 side. When configured in this way, the lower side of the buffer section SA has a high hardness and the upper side of the buffer material SA has a low hardness, so that the strength of the buffer section SA on the ground surface 15 side is increased, thereby improving durability.

[0100] The second aspect is an aspect in which the space factor of the portion of the buffer section SA on the contact surface 15 side (i.e., the lower side) is made smaller than the space factor of the portion of the buffer section SA on the opposite side (i.e., the upper side) from the contact surface 15. In such a configuration, the lower side of the buffer section SA has a low hardness and the upper side of the buffer material SA has a high hardness, so that the deformability of the buffer material SA is improved, thereby improving the buffering properties.

[0101] <First Modification> Fig. 12 is a schematic diagram for explaining the three-dimensional structure of the base layer of the insole included in the footwear according to the first modification. Hereinafter, the insole 20B included in the footwear according to the first modification based on the above-mentioned embodiment 1 will be explained with reference to Fig. 12.

[0102] The insole 20B provided in the footwear of the first modified example differs in configuration from the insole 20A provided in the footwear 1A of the above-mentioned embodiment 1 only in that the base layer 21 has a different three-dimensional structure.

[0103] Specifically, as shown in Fig. 12, the base layer 21 of the insole 20B included in the footwear according to the first modification is composed of a three-dimensional mesh structure 2B in which a unit structure 3B having a three-dimensional wall structure is repeatedly arranged so that the unit structures 3B are adjacent to each other. More specifically, the unit structures 3B are regularly and continuously repeatedly arranged along each of the width direction (X direction shown in the figure), depth direction (Y direction shown in the figure), and height direction (Z direction shown in the figure). In Fig. 12, only three unit structures 3B adjacent to each other in the width direction, depth direction, and height direction are shown, and their cut surfaces are colored dark.

[0104] The unit structure 3B, which is a three-dimensional wall structure, has a three-dimensional shape formed by walls whose outer shape is defined by a pair of parallel curved surfaces. The unit structure 3B shown in the figure is a structure in which thickness is added to a Schwarz P structure, which is a type of mathematically defined triple periodic minimal surface. Note that a minimal surface is defined as a surface with the smallest area among those whose boundary is a given closed curve.

[0105] Here, in the insole 20B provided in the footwear of the first modified example, the cushioning portion SA consisting of the three-dimensional mesh structure 2B is configured so as to satisfy conditions 1-1 to 1-7 described in the first configuration example described above, or conditions 2-1 to 2-7 described in the second configuration example described above, or conditions 3-1 to 3-7 described in the third configuration example described above, or conditions 4-1 to 4-7 described in the fourth configuration example described above, thereby making it possible to provide footwear with functionality suitable for the intended use.

[0106] In addition, as the unit structure 3B consisting of a three-dimensional wall structure having a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel curved surfaces, other structures that have thickness added based on a triple periodic minimal curved surface such as a gyroid structure or a Schwarz D structure can also be used.

[0107] <Second Modification> Fig. 13 is a schematic diagram for explaining the three-dimensional structure of the base layer of the insole included in the footwear according to the second modified example. Hereinafter, the insole 20C included in the footwear according to the second modified example based on the above-mentioned embodiment 1 will be explained with reference to this Fig. 13.

[0108] The insole 20C provided in the footwear of the second modified example differs in configuration from the insole 20A provided in the footwear 1A of the above-mentioned embodiment 1 only in that the base layer 21 has a different three-dimensional structure.

[0109] Specifically, as shown in Fig. 13, the base layer 21 of the insole 20C of the footwear according to the second modification is composed of a three-dimensional mesh structure 2C in which a unit structure 3C having a three-dimensional wall structure is repeatedly arranged so that the unit structures 3C are adjacent to each other. More specifically, the unit structures 3C are regularly and continuously repeatedly arranged along each of the width direction (X direction shown in the figure), depth direction (Y direction shown in the figure), and height direction (Z direction shown in the figure). Fig. 13 shows only five unit structures 3C adjacent to each other in the width direction and depth direction, and only two unit structures 3C adjacent to each other in the height direction.

[0110] The unit structure 3C having a three-dimensional wall structure has a three-dimensional shape formed by walls whose outer shape is defined by a pair of parallel planes. Here, the unit structure 3C shown in the figure is made up of a plurality of planes arranged to intersect with each other, and is thickened to have a cavity inside, specifically, an octet structure with thickness.

[0111] Here, in the insole 20C provided in the footwear of the second modified example, the cushioning portion SA consisting of the three-dimensional mesh structure 2C is configured so as to satisfy conditions 1-1 to 1-7 described in the first configuration example described above, or conditions 2-1 to 2-7 described in the second configuration example described above, or conditions 3-1 to 3-7 described in the third configuration example described above, or conditions 4-1 to 4-7 described in the fourth configuration example described above, thereby making it possible to provide footwear with functionality suitable for the intended use.

[0112] In addition, as the unit structure 3C consisting of a three-dimensional wall structure having a three-dimensional shape formed by a wall whose outer shape is defined by a pair of parallel planes, other structures that can be used include those in which a thickness is added based on multiple planes arranged to intersect with each other so as to have a cavity inside, such as a cubic structure or a cubic octave structure.

[0113] <Embodiment 2> Fig. 14 is a perspective view of footwear according to embodiment 2. Hereinafter, footwear 1B according to this embodiment will be described with reference to Fig. 14.

[0114] 14, footwear 1B has a sole 11 serving as a footbed and an upper 14 located above the sole 11, and the sole 11 includes a sole body 12B and an outsole 13. The sole body 12B is provided in footwear 1B in place of the midsole 12A provided in footwear 1A according to the above-described embodiment 1. Footwear 1B according to this embodiment does not include the insole 20A provided in footwear 1A according to the above-described embodiment 1.

[0115] In the footwear 1B according to this embodiment, the sole body 12B is a model produced by a three-dimensional additive manufacturing method. For example, a photolithography method is adopted as the three-dimensional additive manufacturing method. More specifically, the sole body 12B is composed of a three-dimensional mesh structure 2A as shown in FIG. 7. As a result, the entire sole body 12B of the sole 11 serving as a footbed functions as a shock absorbing section SA composed of the three-dimensional mesh structure 2A. The material of the sole body 12B is not particularly limited, but may be the same as the material of the insole 20A described in the first embodiment.

[0116] Here, in the footwear 1B of this embodiment, the cushioning section SA consisting of the three-dimensional mesh structure 2A is configured so as to satisfy conditions 1-1 to 1-7 described in the first configuration example described above, or conditions 2-1 to 2-7 described in the second configuration example described above, or conditions 3-1 to 3-7 described in the third configuration example described above, or conditions 4-1 to 4-7 described in the fourth configuration example described above.

[0117] Therefore, even in the case of footwear 1B according to this embodiment, it is possible to obtain effects similar to those described in the above-mentioned embodiment 1, and it is possible to provide footwear with functionality suited to the application.

[0118] <Embodiment 3> Fig. 15 is a perspective view of footwear according to embodiment 3, and Fig. 16 is a schematic cross-sectional view taken along line XVI-XVI shown in Fig. 15. Also, Fig. 17 is an exploded view of the footwear shown in Fig. 15. Hereinafter, footwear 1C according to this embodiment will be described with reference to Figs. 15 to 17.

[0119] As shown in Fig. 15 to Fig. 17, footwear 1C is sock-shaped to cover almost the entire wearer's foot (i.e., the area distal to the ankle), and includes a shell 30 and an upper body 40. Both the shell 30 and the upper body 40 have a bag-like shape. Footwear 1C according to the present embodiment does not include the insole 20A included in footwear 1A according to the above-mentioned first embodiment.

[0120] The shell 30 includes a sole portion 31 and an outer upper portion 32. The sole portion 31 has a generally flat shape, and its lower surface constitutes the ground contact surface 15. The outer upper portion 32 stands upright from the periphery of the sole portion 31. An opening 33 is provided in the upper portion of the outer upper portion 32.

[0121] The upper body 40 includes a bottom part 41 and an inner upper part 42. The bottom part 41 has a generally flat shape, and its upper surface constitutes a support surface that supports the sole of the wearer's foot when worn. The inner upper part 42 stands upright from the periphery of the bottom part 41. An opening 16 into which the wearer's foot is inserted is provided at the top of the inner upper part 42.

[0122] The upper body 40 is housed in the shell 30 such that the bottom part 41 is disposed on the sole part 31 of the shell 30 and the inner upper part 42 overlaps the outer upper part 32 of the shell 30. As a result, in the footwear 1C, the footbed is formed by the sole part 31 of the shell 30 and the bottom part 41 of the upper body 40.

[0123] Since the upper body 40 constitutes the portion that comes into contact with the wearer's foot, it is preferable that the upper body 40 is made of a material that can be flexibly deformed, and can be made of, for example, woven fabric, knitted fabric, nonwoven fabric, synthetic leather, resin, etc. In particular, as described below, if a woven fabric, knitted fabric, nonwoven fabric, etc. of a heat-shrinkable synthetic fiber is used, it can be made to fit the wearer's foot better. Note that examples of heat-shrinkable synthetic fibers include those mainly composed of polyester, polyurethane, etc.

[0124] In other words, if the upper body 40 is made of a woven or knitted synthetic fiber fabric or nonwoven fabric having heat shrinkability, it is formed into a bag shape in advance, and the last described below is inserted inside it and then heated. When the upper body 40 is heated and shrinks, it changes shape so that it adheres closely to the molding surface of the last, and the shape after the change is maintained.

[0125] Therefore, if a last corresponding to the shape of the wearer's foot is prepared and used to mold the upper body 40, it is possible to manufacture the upper body 40 that fits the wearer's foot. Furthermore, if the heat treatment using the last is performed in a state where the upper body 40 is assembled into the shell 30, the upper body 40 will also fit the shell 30, and the fit can be further improved.

[0126] In the footwear 1C according to this embodiment, the sole portion 31 is a model produced by a three-dimensional additive manufacturing method. For example, a photolithography method is used as the three-dimensional additive manufacturing method. Here, the sole portion 31 of the shell 30 is composed of a three-dimensional mesh structure 2A as shown in FIG. 7. As a result, the entire sole portion 31 as a footbed functions as a shock absorbing portion SA composed of the three-dimensional mesh structure 2A. The material of the shell 30 is not particularly limited, but may be the same as the material of the insole 20A described in the above-mentioned first embodiment.

[0127] Here, in the footwear 1C of this embodiment, the cushioning section SA consisting of the three-dimensional mesh structure 2A is configured so as to satisfy conditions 1-1 to 1-7 described in the first configuration example described above, or conditions 2-1 to 2-7 described in the second configuration example described above, or conditions 3-1 to 3-7 described in the third configuration example described above, or conditions 4-1 to 4-7 described in the fourth configuration example described above.

[0128] Therefore, even in the case of footwear 1C according to this embodiment, it is possible to obtain effects similar to those described in the above-mentioned embodiment 1, and it is possible to provide footwear with functionality suited to the application.

[0129] <Summary of the contents disclosed in the embodiments etc.> The characteristic configurations disclosed in the above-mentioned embodiments can be summarized as follows.

[0130] [Appendix 1] Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot, the forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, the forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface; The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is greater than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion at a portion located at the midfoot portion on the inner foot side is greater than a space factor of the buffer portion at a portion located at the midfoot portion on the outer foot side, a space factor of the buffer portion at a portion located at the medial rear foot part is greater than a space factor of the buffer portion at a portion located at the lateral rear foot part, a space factor of the buffer portion in a portion located in the medial forefoot portion is smaller than a space factor of the buffer portion in a portion located in the medial midfoot portion, a space factor of the buffer portion in a portion located in the lateral forefoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located in the medial midfoot portion is equal to or smaller than a space factor of the buffer portion at a portion located in the medial rearfoot portion, The footwear has a volume factor of the cushioning part located in the midfoot part on the lateral side of the foot, which is equal to or smaller than a volume factor of the cushioning part located in the rearfoot part on the lateral side of the foot.

[0131] [Appendix 2] Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot, the forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, the forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface; The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is greater than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion at a portion located at the midfoot portion on the inner foot side is greater than a space factor of the buffer portion at a portion located at the midfoot portion on the outer foot side, a space factor of the buffer portion at a portion located at the medial rear foot part is greater than a space factor of the buffer portion at a portion located at the lateral rear foot part, a space factor of the buffer portion in the portion located in the medial forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the medial midfoot portion, a space factor of the buffer portion in the portion located in the lateral forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the lateral midfoot portion, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the medial rearfoot portion, The footwear has a larger space factor of the cushioning part in the portion located in the lateral midfoot part than the space factor of the cushioning part in the portion located in the lateral rearfoot part.

[0132] [Appendix 3] Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot, the forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, the forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface; The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is smaller than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion at a portion located at the midfoot portion on the inner foot side is smaller than a space factor of the buffer portion at a portion located at the midfoot portion on the outer foot side, a space factor of the buffer portion at a portion located at the medial side rear foot part is smaller than a space factor of the buffer portion at a portion located at the lateral side rear foot part, a space factor of the buffer portion in a portion located in the medial forefoot portion is smaller than a space factor of the buffer portion in a portion located in the medial midfoot portion, a space factor of the buffer portion in a portion located in the lateral forefoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located in the medial midfoot portion is equal to or smaller than a space factor of the buffer portion at a portion located in the medial rearfoot portion, The footwear has a volume factor of the cushioning part located in the midfoot part on the lateral side of the foot, which is equal to or smaller than a volume factor of the cushioning part located in the rearfoot part on the lateral side of the foot.

[0133] [Appendix 4] Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot, the forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, the forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface; The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is smaller than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion at a portion located at the midfoot portion on the inner foot side is smaller than a space factor of the buffer portion at a portion located at the midfoot portion on the outer foot side, a space factor of the buffer portion at a portion located at the medial side rear foot part is smaller than a space factor of the buffer portion at a portion located at the lateral side rear foot part, a space factor of the buffer portion in the portion located in the medial forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the medial midfoot portion, a space factor of the buffer portion in the portion located in the lateral forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the lateral midfoot portion, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the medial rearfoot portion, The footwear has a larger space factor of the cushioning part in the portion located in the lateral midfoot part than the space factor of the cushioning part in the portion located in the lateral rearfoot part.

[0134] [Appendix 5] 5. Footwear according to any one of claims 1 to 4, wherein the three-dimensional mesh structure has a three-dimensional lattice structure.

[0135] [Appendix 6] 5. Footwear described in any one of appendix 1 to 4, wherein the three-dimensional mesh structure has a three-dimensional wall structure formed by walls whose outline is defined by a pair of parallel planes or curved surfaces.

[0136] [Appendix 7] 7. The footwear of claim 6, wherein the three-dimensional wall structure includes a structure in which a triple periodic minimal curved surface is used as a reference surface and a thickness is added to the reference surface.

[0137] [Appendix 8] Footwear as described in Appendix 6, wherein the three-dimensional wall structure includes a structure in which a thickness is added to a reference surface that is made up of a plurality of planes arranged to intersect with each other so as to have a cavity therein.

[0138] [Appendix 9] 9. Footwear described in any one of appendix 1 to 8, wherein the cushioning portion is made of a single object formed by a three-dimensional additive manufacturing method.

[0139] [Appendix 10] the footbed including a sole; 10. Footwear according to any one of claims 1 to 9, wherein the sole includes the cushioning portion.

[0140] [Appendix 11] the footbed includes a sole and an insole; 10. Footwear according to any one of claims 1 to 9, wherein the insole includes the cushioning portion.

[0141] <Other forms, etc.> In the above-mentioned embodiments, specific examples of uses of footwear have been given, such as running shoes designed for running with a heel strike running style, midfoot running style, forefoot running style, etc., and shoes used for specific athletic purposes such as tennis, table tennis, basketball, etc.; however, the uses (sports, etc.) of the shoes are not limited to these.

[0142] The above-mentioned embodiments disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the claims, and includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0143] 1A to 1C footwear, 2A to 2C three-dimensional mesh structure, 3A to 3C unit structure, 10 shoe body, 11 sole, 12A midsole, 12B sole body, 13 outsole, 14 upper, 15 ground contact surface, 16 opening, 20A to 20C, 20A1 to 20A4 insole, 21 base layer, 21a upper surface, 21b lower surface, 22 upper layer, 22a upper surface, 22b lower surface, 22c hole, 30 shell, 31 sole portion, 32 outer upper portion, 33 opening, 40 upper body, 41 bottom portion, 42 inner upper portion, A inner forefoot portion, B outer forefoot portion, C inner midfoot portion, D outer midfoot portion, E inner rearfoot portion, F Outer side of rear foot, HC heel center, R1 forefoot, R2 midfoot, R3 rear foot, SA cushioning area, SC shoe center.

Claims

1. Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot; The forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, The forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is greater than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located on the medial side of the rear foot part is greater than a space factor of the buffer portion at a portion located on the lateral side of the rear foot part, a space factor of the buffer portion in a portion located in the medial forefoot portion is smaller than a space factor of the buffer portion in a portion located in the medial midfoot portion, a space factor of the buffer portion in a portion located in the lateral forefoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion in the portion located in the medial midfoot portion is equal to or smaller than a space factor of the buffer portion in the portion located in the medial rearfoot portion, The footwear, wherein a volume factor of the cushioning part in the portion located in the lateral midfoot part is equal to or smaller than a volume factor of the cushioning part in the portion located in the lateral rearfoot part.

2. Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot; The forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, The forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion at a portion located at the medial forefoot part is greater than a space factor of the buffer portion at a portion located at the lateral forefoot part, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located on the medial side of the rear foot part is greater than a space factor of the buffer portion at a portion located on the lateral side of the rear foot part, a space factor of the buffer portion in the portion located in the medial forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the medial midfoot portion, a space factor of the buffer portion in the portion located in the lateral forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the lateral midfoot portion, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the medial rearfoot portion, The footwear has a larger space factor of the cushioning part in a portion located in the lateral midfoot part than a space factor of the cushioning part in a portion located in the lateral rearfoot part.

3. Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot; The forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, The forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion in a portion located in the medial forefoot part is smaller than a space factor of the buffer portion in a portion located in the lateral forefoot part, a space factor of the buffer portion in a portion located in the medial midfoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located at the medial side rear foot part is smaller than a space factor of the buffer portion at a portion located at the lateral side rear foot part, a space factor of the buffer portion in a portion located in the medial forefoot portion is smaller than a space factor of the buffer portion in a portion located in the medial midfoot portion, a space factor of the buffer portion in a portion located in the lateral forefoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion in the portion located in the medial midfoot portion is equal to or smaller than a space factor of the buffer portion in the portion located in the medial rearfoot portion, The footwear, wherein a volume factor of the cushioning part in the portion located in the lateral midfoot part is equal to or smaller than a volume factor of the cushioning part in the portion located in the lateral rearfoot part.

4. Footwear comprising a footbed that supports the sole of a wearer's foot and includes a contact surface, The footbed includes a forefoot portion supporting the toes and plantar fascia of the wearer's foot, a midfoot portion supporting the arch of the wearer's foot, and a rearfoot portion supporting the heel of the wearer's foot; The forefoot portion, the midfoot portion, and the rearfoot portion are positioned consecutively along a front-to-rear direction of the footwear, The forefoot portion includes an inner forefoot portion and an outer forefoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, The midfoot portion includes an inner midfoot portion and an outer midfoot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground surface, the rear foot portion includes an inner rear foot portion and an outer rear foot portion defined by a shoe center of the footwear when viewed along a direction perpendicular to the ground contact surface, the footbed includes a cushioning section that is positioned across the medial forefoot section, the lateral forefoot section, the medial midfoot section, the lateral midfoot section, the medial rearfoot section, and the lateral rearfoot section, and that is made of a three-dimensional mesh structure in which a plurality of unit structures are repeatedly arranged so that they are adjacent to each other; a space factor of the buffer portion in a portion located in the medial forefoot part is smaller than a space factor of the buffer portion in a portion located in the lateral forefoot part, a space factor of the buffer portion in a portion located in the medial midfoot portion is smaller than a space factor of the buffer portion in a portion located in the lateral midfoot portion, a space factor of the buffer portion at a portion located at the medial side rear foot part is smaller than a space factor of the buffer portion at a portion located at the lateral side rear foot part, a space factor of the buffer portion in the portion located in the medial forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the medial midfoot portion, a space factor of the buffer portion in the portion located in the lateral forefoot portion is equal to or greater than a space factor of the buffer portion in the portion located in the lateral midfoot portion, a space factor of the buffer portion in a portion located in the medial midfoot portion is greater than a space factor of the buffer portion in a portion located in the medial rearfoot portion, The footwear has a larger space factor of the cushioning part in a portion located in the lateral midfoot part than a space factor of the cushioning part in a portion located in the lateral rearfoot part.

5. The footwear according to claim 1 , wherein the three-dimensional mesh structure has a three-dimensional lattice structure.

6. 5. The footwear according to claim 1, wherein the three-dimensional mesh structure has a three-dimensional wall structure formed by walls whose outer shape is defined by a pair of parallel planes or curved surfaces.

7. 7. The footwear according to claim 6, wherein the three-dimensional wall structure includes a structure in which a triply periodic minimal curved surface is used as a reference surface and a thickness is added to the reference surface.

8. Footwear according to claim 6, wherein the three-dimensional wall structure includes a structure in which a thickness is added to a reference surface that is a plurality of planes arranged to intersect with each other so as to have a cavity therein.

9. The footwear according to claim 1 , wherein the cushioning portion is made of a single object produced by a three-dimensional additive manufacturing method.

10. the footbed includes a sole; 5. Footwear according to claim 1, wherein the sole includes the cushioning portion.

11. the footbed includes a sole and an insole; 5. The footwear according to claim 1, wherein the insole includes the cushioning portion.

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