Shoe

Abstract

A shoe comprises, on the bottom surface of the sole thereof, a medial-side-ball-region protuberant portion in which a region corresponding to the medial-side ball of the foot protrudes furthest above the ground. This shoe may additionally be configured to comprise, on said bottom surface, a heel-medial-region protuberant portion in which a region corresponding to the medial side of the heel of the foot protrudes above the ground, and a lateral-vertical-arch-region protuberant portion in which a region corresponding to the lateral vertical arch connecting the lateral-side ball of the foot and the heel protrudes above the ground. This shoe suppresses pronation and exhibits excellent resilience.

Description

shoes

[0001] This invention relates to shoes.

[0002] For example, various shoe sole structures have been proposed to improve the stability of leg movement during jogging and the rebound when getting out of bed (see, for example, Patent Document 1).

[0003] Japanese Patent Publication No. 2000-333707

[0004] Suppressing pronation, the inward rolling of the foot, is a key function required of footwear. Furthermore, responsiveness contributes to movement by mitigating impact on the foot and enhancing propulsion. However, achieving a good balance between pronation suppression and responsiveness has been challenging.

[0005] This disclosure is a proposal to solve these problems, and provides a shoe that suppresses pronation while providing good rebound.

[0006] In a specific embodiment of this disclosure, the shoe has a ball-of-the-foot area on the bottom surface of the sole, in which the area corresponding to the ball of the foot is the most raised relative to the ground.

[0007] Based on the proposals in this disclosure, it is possible to provide shoes that offer good rebound while suppressing pronation.

[0008] This is an exploded perspective view showing the appearance of the shoes according to this embodiment. This is an external perspective view of the sole. This is a bottom view of the sole. This is a diagram showing the general names of the parts of the sole. This is a diagram for explaining the structure of the sole. This is a perspective view showing the sole placed on the ground in an unloaded state. These are X-X cross-sectional views of the unloaded state and the loaded state, respectively.

[0009] The following disclosure will describe specific embodiments, but the invention claimed is not limited to these embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential for solving the problem. In each figure, components with the same reference numerals have the same or similar configurations, and redundant explanations are omitted.

[0010] Figure 1 is an exploded perspective view showing the appearance of the shoe 300 according to this embodiment. The shoe 300 is a shoe intended primarily for running, such as jogging. The shoe 300 has a sole 100 and an upper 200. The upper 200 is bonded or sewn to the periphery of the sole 100 and covers the top of the wearer's foot. The sole 100 may employ, for example, a midsole, an outsole, or a laminated structure of an outsole and a midsole. An insole that contacts the bottom of the wearer's foot may be laminated to the sole 100.

[0011] The sole 100 has a three-dimensional structure that includes a bottom surface 101 facing the ground and a circumferential surface 102 surrounding the periphery of the bottom surface 101. The circumferential surface 102 has a recess 150 that extends from the toe side to the heel side and is formed in the shape of a V-groove or U-groove. The sole 100 is made of an elastic material such as foam. For example, EVA resin (Ethylen-Vinyl Acetate copolymer resin) is suitable as the material for the sole 100.

[0012] Note that Figure 1 shows only the left shoe of shoe 300, but of course, shoe 300 comes as a pair, left and right. In the following explanation, shoe 300 will be described using the left shoe as a representative, but the construction of the right shoe is symmetrical to that of the left shoe, so its explanation will be omitted.

[0013] Figure 2 is an external perspective view of the sole 100. Figure 3 is a bottom view of the sole 100. Figure 4 is a diagram showing the general names of the different parts of the sole of the foot. The configuration of each part of the sole 100 shown in Figures 2 and 3 will be explained with reference to the parts of the sole of the foot shown in Figure 4.

[0014] The sole 100 has a ball-of-the-foot area raised portion 110 (hereinafter referred to as the first raised portion 110) on its bottom surface 101, which is raised in the direction of the ground in the area corresponding to the ball of the wearer's foot when the wearer wears the shoe 300. More specifically, the first raised portion 110 bulges in the direction of the ground so that the entire area corresponding to the ball of the wearer's foot forms a single hill.

[0015] Strictly speaking, the position of the ball of the foot differs from person to person, but since the shoes 300 are manufactured in sizes corresponding to the wearer's foot size, the area corresponding to the ball of the foot for a wearer wearing the same size shoes 300 will be approximately within the area enclosed by the dotted line in the figure. In other words, the first raised portion 110 only needs to be raised across the entire area corresponding to this ball of the foot.

[0016] In addition, as shown in Figures 2 and 3, the bottom surface 101 may be provided with minute irregularities (honeycomb-shaped irregularities in the example shown) to enhance grip on the ground, but each raised portion described in this disclosure does not refer to such individual irregularities. The first raised portion 110, for example, generates a rebound force against the ball of the foot area when stepped on by the wearer, and also receives the load to suppress pronation.

[0017] Furthermore, the sole 100 has a lateral longitudinal arch region ridge 120 (hereinafter referred to as the second ridge 120) on its bottom surface 101, which is raised relative to the ground direction in a region corresponding to the lateral longitudinal arch connecting the little toe ball and the heel of the wearer when the wearer wears the shoes 300. More specifically, the second ridge 120 bulges toward the ground direction such that a region of the wearer's lateral longitudinal arch that includes at least the midpoint connecting the little toe ball and the heel forms a single hill. When the wearer steps on the second ridge 120, the second ridge 120 as a whole generates a repulsive force toward the lateral longitudinal arch region, pushing the foot forward in a rolling motion and contributing to a smooth lift-off. Note that the top of the second ridge 120 is not limited to a curved surface as shown in the figure, but may be a flat surface. That is, the tops of the first ridge 110 and the third ridge 130 may be curved surfaces, and the top of the second ridge 120 may be a flat surface. By making the top of the second raised portion 120 a flat surface, stability during ground contact can be improved even if there is only one raised portion on the outer foot side.

[0018] Furthermore, the sole 100 has a heel medial area bulge 130 (hereinafter referred to as the third bulge 130) on its bottom surface 101, which is raised relative to the ground when the wearer wears the shoe 300 and corresponds to the medial side of the wearer's heel. More specifically, the third bulge 130 bulges toward the ground so that about half of the area on the medial side of the area corresponding to the wearer's heel forms a single hill. Similar to the first bulge 110, the third bulge 130 generates a rebound force relative to the medial side of the heel when, for example, the wearer steps on it, and also receives the load to suppress pronation toward the medial side.

[0019] Preferably, the first, second, and third raised portions 110, 120, and 130 are all formed with a convex curved surface toward the ground. If the first and third raised portions 110 and 130 are formed with a convex curved surface toward the ground, pronation can be more effectively suppressed in response to the wearer's foot movement. Also, if the second raised portion 120 is formed with a convex curved surface toward the ground, a more effective rebound force can be generated against the outer longitudinal arch region as a whole when the wearer steps down.

[0020] Furthermore, as shown in Figure 1, the circumferential surface 102 is provided with recesses 150 that extend from the toe side to the heel side. In particular, the first recess 151 is located at the position corresponding to the first ridge 110, the second recess 152 is located at the position corresponding to the second ridge 120, and the third recess 153 is located at the position corresponding to the third ridge 130, and these recesses are provided slightly deeper than the surrounding areas to obtain greater rebound force. The function of each recess will be described later.

[0021] The structure of the sole 100 will be described in detail. Figure 5 is a diagram illustrating the structure of the sole 100. Specifically, it is a schematic bottom view showing the bottom surface 101 of the sole 100, and corresponds to the bottom view in Figure 3.

[0022] When the sole 100 is observed from the bottom side, the bottom surface 101 first has a first region A where the first raised portion 110 exists. １ , second region A where the second raised portion 120 exists ２ , third region A where the third raised portion 130 exists３ It can be seen that it has. Here, in order to explain each region of the bottom surface 101, a center line C connecting the toe end, which is the end on the toe side, and the heel end, which is the end on the heel side, is defined as shown in the figure. The toe end and the heel end are the center line length L ０ is determined to be maximum. When such a center line C is defined, the first region A １ is mainly on the inner foot side of the center line C (a part extends to the outer foot side across the center line C), and preferably occupies a range of about 40% or less from the toe side with respect to the center line length L ０ . Also, the second region A ２ is mainly on the outer foot side of the center line C, and preferably occupies a range of about 20% or more and 80% or less from the toe side with respect to the center line length L ０ . Also, the third region A ３ is mainly on the inner foot side of the center line C (a part extends to the outer foot side across the center line C), and preferably occupies a range of about 40% or less from the heel side with respect to the center line length L ０ .

[0023] In this way, when the first raised portion 110, the second raised portion 120, and the third raised portion 130 are provided in order from the toe side as inner foot side → outer foot side → inner foot side, the skirts of the respective raised portions form a valley shape, and when viewed from above, it can be recognized that concave portions are included along the bottom curve R in the shape of a sine wave as shown in the figure. The concave portions formed in the shape of a sine wave in this way serve as a space for allowing the deformation (collapse) when the respective raised portions are sequentially deformed when the wearer of the shoe 300 repeats the movement of the leg from touching the ground to leaving the floor, and contribute to stabilizing it within a certain range without disturbing the COP (center of pressure) locus.

[0024] In addition, in the bottom surface 101 according to the present embodiment, the peripheral portion on the outer foot side is slightly raised compared to the adjacent inner foot side portion also at the peripheral portion on the toe side and the peripheral portion on the heel side that are respectively continuous with the second region A ２ , so the first region A １ and the third region A３ A clear recess is formed between them. However, from the viewpoint of securing space to allow deformation when the first raised portion 110 and the third raised portion 130 are crushed by a load, the vicinity of their peripheral portions may be flat.

[0025] First area A １ , second area A ２ , third area A ３ When these are set as described above, the fourth region A, which is the region enclosed by them and corresponds to the inner longitudinal arch, is formed. ４ A sinking section is formed in this area, which sinks away from the ground. This inner longitudinal arch region sinking section 140 (hereinafter referred to as the sinking section 140) functions as a space that allows deformation of the first raised section 110, the second raised section 120, and the third raised section 130 under load. In other words, the sinking section 140 contributes to more effectively suppressing the wearer's pronation by significantly deforming the raised first raised section 110, the second raised section 120, and the third raised section 130, and also generates a large rebound force.

[0026] The sinking section 140 is a part where loads tend to concentrate. In particular, loads due to the deformation of the preceding and succeeding first and third raised sections 110 and 130 tend to concentrate there. Therefore, if it is important to deform the sinking section 140 integrally with the first and third raised sections 110 and 130, it is preferable that the sinking section 140 be formed integrally from the same material as them. On the other hand, if it is important that the sinking section 140 can withstand deformation, it is preferable that the sinking section 140 has higher rigidity than the material of the first and third raised sections 110 and 130. For example, it is preferable that the sinking section 140 be formed as a separate part from a material with higher rigidity than the material of the first and third raised sections 110 and 130.

[0027] The first vertex P is the apex of the first raised portion 110. １ The center line length L ０ For range L １ It is preferable that the first vertex P is located within a range of 15% to 40% from the toe tip indicated by the symbol. １ It is preferable that this is located at the boundary on the inner foot side of the bottom surface 101. Similarly, the third vertex P, which is the apex of the third raised portion 130.３ The center line length L ０ For range L ３ It is preferable that the third vertex P is located within a range of 10% to 30% from the heel tip indicated by [the symbol]. ３ It is preferable that it be located at the boundary on the inner foot side of the bottom surface 101.

[0028] The second vertex P is the apex of the second raised section 120. ２ The first vertex P is located in the direction from the tip of the toe to the tip of the heel. １ and the third vertex P ３ It is preferable that it be located between these two points. Also, the second vertex P ２ It is preferable that this is located at the boundary on the outer foot side of the bottom surface 101. Also, when the shoe 300 is placed on the ground without any load, the deepest point B of the sinking section 140 is the one that is furthest from the ground. １ The center line length L ０ For range L ４ It is preferable that it be located in a range of 30% to 60% from the heel tip indicated by [the symbol]. The inventors of this application, through trial and error, have determined that the first vertex P １ , second vertex P ２ , third vertex P ３ , deepest point B １ We found that by arranging the components as described above, it is possible to achieve a good balance between suppressing pronation, stabilizing the COP trajectory, and providing rebound during foot strike.

[0029] Next, the first vertex P １ , second vertex P ２ , third vertex P ３ , deepest point B １ The relationships between the components when they are arranged as described above will now be explained. Figure 6 is a perspective view showing the sole 100 placed on the ground in an unloaded state. In this embodiment, the sole 100 has three raised parts, so it makes contact with the ground at these three vertices.

[0030] In the sole 100 according to this embodiment, the sinking portion 140 is formed surrounded by the first raised portion 110, the second raised portion 120, and the third raised portion 130. Therefore, the sinking portion 140 can be said to be a part of the base of the first raised portion 110, a part of the base of the second raised portion 120, and a part of the base of the third raised portion 130. Furthermore, in the sole 100 according to this embodiment, the deepest point B １ This point is the deepest point at the base of the first raised section 110, the deepest point at the base of the second raised section 120, and the deepest point at the base of the third raised section 130.

[0031] In this relationship, the first vertex P １ and the deepest point B １ Distance S １ This is the second vertex P. ２ and the deepest point B １ Distance S ２ Larger than, and the third vertex P ３ and the deepest point B １ Distance S ３ It is larger than the first raised portion 110. This relationship means that on the bottom surface 101, the first raised portion 110 can be evaluated as rising towards the ground with a larger volume than the second raised portion 120 and the third raised portion 130. In other words, on the bottom surface 101 of the sole 100 in this embodiment, the first raised portion 110 is the largest raised portion toward the ground.

[0032] In this embodiment, the first vertex P １ , second vertex P ２ , third vertex P ３ Deepest point B surrounded by １ However, this is the deepest point common to the bases of the first ridge 110, the second ridge 120, and the third ridge 130. The deepest point B is surrounded by these three vertices. １ Distance S based on １ , distance S ２ , distance S ３ When comparing, S １ > S ２ and S １ > S ３ Therefore, it can be evaluated that the first raised portion 110 is the most significantly raised toward the ground.１ = S ２ = S ３ In that case, the three raised areas can be evaluated as being similarly raised, and this is also good from the standpoint of suppressing pronation and stabilizing the COP trajectory.

[0033] Furthermore, the first vertex P １ , second vertex P ２ , third vertex P ３ Even if there are separate deepest points for each of the bases, the above-mentioned distance relationship holds true in most cases if the first raised section 110 is the most raised toward the ground. That is, the first vertex P １ The distance between the first raised portion 110 and the deepest point of the base of the thenar region is the second vertex P ２ The distance between the second raised portion 120 and the deepest point of the outer longitudinal arch region base, and the third vertex P. ３ This distance is greater than the distance to the deepest point of the heel medial foot region, which is the base of the third ridge 130. In other words, even if other ridges exist on the sole surface 101, the fact that the first ridge 110, which corresponds to the ball of the foot, is the most prominent relative to the ground greatly contributes to suppressing pronation. Furthermore, even if no other ridges exist on the sole surface 101 and only the first ridge 110 exists, pronation is suppressed within a certain range.

[0034] Next, we will explain the rebound properties generated by the sole 100. Figure 7 shows the first vertex P. １ Figure 3 shows schematic cross-sectional diagrams of the X-X line, including the unloaded and loaded states. In particular, the left diagram of Figure 7 shows the first vertex P. １ , second vertex P ２ , third vertex P ３ The first diagram shows the cross-section when the three vertices are in contact with the ground, while the right diagram in Figure 3 shows the cross-section when the wearer is stepping on it.

[0035] As shown in the left diagram of Figure 7, the sole 100 has a first recess 151 on the circumferential surface 102 corresponding to the first raised portion 110. The first recess 151 is formed in a V-shaped or U-shaped groove shape by a lower surface 151a, which is the side facing the ground, and an upper surface 151b that is continuous upward from the lower surface 151a. In particular, the lower surface 151a is a curved surface that is convex toward the ground, which makes it easier to generate a greater rebound force when the wearer steps down.

[0036] In the cross-section of the first recess 151, the depth D from the portion protruding toward the inner foot to the bottom of the recess is equal to the first apex P of the first raised portion 110. １ It is formed so that it is deeper than the surrounding area at the location where it exists. Also, the height H from the ground at the bottom of the recess in the cross-section. ｄ The height H of the point on the upper surface of the sole 100 closest to the ground is ｓ In contrast, it falls within the range of 30% to 70%. When such a geometric relationship holds, the raised portion 110 deforms more significantly in response to the wearer's stepping motion, and exhibits a high rebound effect while more effectively suppressing pronation without causing the wearer to feel any discomfort such as their foot tilting.

[0037] In addition, the relationship between the first raised portion 110 and the first recess 151 has been mainly explained above, but the relationships between the second raised portion 120 and the second recess 152, and the third raised portion 130 and the third recess 153 are similar.

[0038] In the unloaded state shown in the left diagram of Figure 7, the height from the ground to the upper surface of the sole 100 corresponding to the first raised portion 110 is W. １Ｆ Assuming that the same load is applied to the first raised section 110, the second raised section 120, and the third raised section 130 shown in the right diagram of Figure 7, the height from the ground to the top surface at the same location is W. １Ｐ Let it be so. At this time, the amount of deformation per unit length in the first raised portion 110 is (W １Ｆ -W １Ｐ ) / W １Ｆ It can be defined as follows. Similarly, the height from the ground to the upper surface of the sole 100 corresponding to the second raised portion 120 in an unloaded state is W ２ＦLet the height from the ground to the upper surface at the same location in the loaded state be \(W\). ２Ｐ Then, the amount of deformation per unit length can be defined as \((W ２Ｆ −W ２Ｐ ) / W ２Ｆ Also, let the height from the ground to the upper surface of the sole 100 corresponding to the third raised portion 130 in the unloaded state be \(W ３Ｆ Let the height from the ground to the upper surface at the same location in the loaded state be \(W ３Ｐ Then, the amount of deformation per unit length can be defined as \((W ３Ｆ −W ３Ｐ ) / W ３Ｆ As a result of trial and error, the inventor of the present application found that \((W １Ｆ −W １Ｐ ) / W １Ｆ >(W ２Ｆ −W ２Ｐ ) / W ２Ｆ and \((W １Ｆ −W １Ｐ ) / W １Ｆ >(W ３Ｆ −W ３Ｐ ) / W ３Ｆ If the amount of deformation of each raised portion is adjusted so that these conditions are satisfied, it was found that a high repulsive effect can be exerted while suppressing pronation.

[0039] In other words, it was found that varying the amount of deformation of each raised section under the same load, and in particular making the degree of deformation of the first raised section 110 greater than that of the second raised section 120 and the third raised section 130, is effective in suppressing pronation and achieving a high rebound effect. Therefore, in order to vary the degree of deformation of each raised section, as shown in Figure 7, the sole 100 has a two-layer structure consisting of a first layer 100a placed on the bottom surface and a second layer 100b laminated on its upper surface. The first material of the first layer 100a and the second material of the second layer 100b are different from each other, and in particular, materials with different hardnesses are used. Considering the comfort of the wearer when stepping, it is preferable that the material of the first layer 100a is harder than the material of the second layer 100b. Alternatively, even if the first material of the first layer 100a and the second material of the second layer 100b are the same, it is preferable that the first layer 100a is molded to be harder than the second layer 100b. Furthermore, the sole 100 may be a single-layer structure including the first layer 100a and the second layer 100b, or it may be a layered structure in which the hardness gradually changes.

[0040] The hardness of each component constituting the sole can be measured, for example, by a measurement method conforming to the hardness test of JIS-K7312. This measurement method involves first preparing a test piece of the target component with a specified thickness or greater. Next, the test piece is placed on a flat surface, and the pressure surface of a durometer is pressed against the test piece so that the indenter is perpendicular to the measurement surface of the test piece. The value of the indentation depth when the pressure surface is pressed against the test piece is taken as the hardness measurement value. The above measurement is performed five times such that the contact points of the indenters are separated by at least 6 mm from each other, and the median value of the five measurements obtained is taken as the hardness of the test piece. If the thickness of the test piece is less than the specified value, test pieces of the same type may be stacked.

[0041] To create a two-layer structure that results in different degrees of deformation in each raised section, one can adjust the thickness of the first layer 100a and the second layer 100b, for example. Considering such adjustments, the boundary between the first layer 100a and the second layer 100b appears in the recess 150 (for example, in the first raised section 110, as shown in the figure, the first recess 151). Regarding the adjustment of the thickness of the first layer 100a and the second layer 100b, from the perspective of ease of manufacturing, one can consider either keeping the thickness of the first layer 100a constant and changing the thickness of the second layer 100b in sections, or keeping the thickness of the second layer 100b constant and changing the thickness of the first layer 100a in sections. In addition, other possibilities include changing the thickness of both the first layer 100a and the second layer 100b in sections, or using only the first layer 100a or only the second layer 100b in certain areas. Furthermore, the sole 100 is not limited to a two-layer structure; it may also have a structure in which more layers are stacked.

[0042] 100...Sole, 100a...First layer, 100b...Second layer, 101...Bottom surface, 102...Circumferential surface, 110...First ridge (Ball's foot ridge), 120...Second ridge (Lateral longitudinal arch ridge), 130...Third ridge (Heel medial foot ridge), 140...Sinking area (Medial longitudinal arch sinking area), 150...Concave, 151...First recess, 151a...Lower surface, 151b...Upper surface, 152...Second recess, 153...Third recess, 200...Upper, 300...Shoe, A １ ...first area, A ２ ...Second area, A ３ ...Third area, A ４ ...Fourth area, P １ ...First vertex, P ２ ...Second vertex, P ３ ...Third vertex, B １ ...deepest point, C...center line, R...bottom curve

Claims

1. A shoe having a raised area on the bottom surface of the sole, where the area corresponding to the ball of the foot is the most raised relative to the ground.

2. The shoe according to claim 1, wherein the apex of the raised portion in the ball of the foot region is located at the medial boundary of the sole.

3. The shoe according to claim 1, wherein the apex of the raised portion in the ball of the foot area is located within a range of 15% to 40% from the toe end with respect to the length of the center line connecting the toe end and heel end of the sole.

4. The shoe according to claim 1, wherein the circumferential surface of the sole has a recess extending from the toe side to the heel side at least at a position corresponding to the raised area of ​​the ball of the foot.

5. The shoe according to claim 1, wherein the sole surface has a heel medial foot region elevation portion in which the region corresponding to the medial side of the heel is raised relative to the ground, and a lateral longitudinal arch region elevation portion in which the region corresponding to the lateral longitudinal arch connecting the little toe ball and the heel is raised relative to the ground.

6. The shoe according to claim 5, wherein the apex of the raised portion of the medial heel region is located at the medial boundary of the sole.

7. The shoe according to claim 6, wherein the apex of the raised portion of the medial heel region is located within a range of 10% to 30% from the heel end with respect to the length of the center line connecting the toe end and the heel end of the sole.

8. The shoe according to claim 5, wherein the apex of the raised portion of the outer longitudinal arch region is formed flat.

9. The shoe according to claim 5, wherein the bottom surface has an inner longitudinal arch region recessed portion in which the region corresponding to the inner longitudinal arch is recessed away from the ground, and the deepest point of the inner longitudinal arch region recessed portion is located in a range of 30% to 60% from the heel end with respect to the line length of the center line connecting the toe end and the heel end of the sole.

10. The shoe according to claim 5, wherein the sole surface, in the absence of load, contacts the ground at three points: the apex of the ball of the foot region, the apex of the heel medial foot region, and the apex of the lateral longitudinal arch region.

11. The shoe according to claim 5, wherein, when the sole surface is in contact with the ground without load, the distance between the apex of the ball of the foot area and the deepest point of the base of the ball of the foot area forming the base of the ball of the foot area is greater than the distance between the apex of the medial heel area area and the deepest point of the base of the medial heel area forming the base of the medial heel area area, and the distance between the apex of the lateral longitudinal arch area area and the deepest point of the base of the lateral longitudinal arch area forming the base of the lateral longitudinal arch area.

12. The shoe according to claim 11, wherein a portion of the base of the ball of the foot area, a portion of the base of the outer longitudinal arch area, and a portion of the base of the inner heel area continuously form sinusoidal recesses on the sole surface.

13. The shoe according to claim 5, wherein, when the same load is applied to the sole in the direction of the ground, the amount of deformation per unit length of the ball of the foot region is greater than the amount of deformation per unit length of the medial heel region and the lateral longitudinal arch region, respectively.

14. The shoe according to claim 5, wherein the raised surfaces of the ball of the foot region, the medial heel region, and the lateral longitudinal arch region are convex curved surfaces toward the ground.

15. The shoe according to claim 5, wherein the bottom surface has a recessed medial longitudinal arch region where the region corresponding to the medial longitudinal arch is recessed away from the ground, and the sole is integrally formed of the ball of the foot region, the recessed medial longitudinal arch region, and the heel medial foot region region from the same material.

16. The shoe according to claim 5, wherein the sole has a recessed medial longitudinal arch region in which the region corresponding to the medial longitudinal arch is recessed away from the ground, and the recessed medial longitudinal arch region of the sole has higher rigidity than the raised portion of the ball of the foot region and the raised portion of the medial heel region.

17. The shoe according to claim 5, wherein the circumferential surface of the sole has recesses extending from the toe side to the heel side at least at positions corresponding to the ball of the foot region, the medial heel region, and the lateral longitudinal arch region.

18. The shoe according to claim 17, wherein the recess is formed deeper than the surrounding area at positions corresponding to the apex of the ball of the foot region, the medial heel region, and the lateral longitudinal arch region.

19. The shoe according to claim 17, wherein the sole has a first layer disposed on the bottom surface and a second layer laminated on the upper surface of the first layer, and the recess is provided to include the boundary between the first layer and the second layer.

20. The shoe according to claim 19, wherein the first layer is formed of a material that is harder than the second layer.

21. The shoe according to claim 17, wherein the curved surface of the recess on the ground side is a convex curved surface toward the ground.

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