| CPC A43B 13/127 (2013.01) [A43B 7/144 (2013.01); A43B 13/04 (2013.01); A43B 13/14 (2013.01)] | 12 Claims |
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1. A sole structure for a shoe, the sole structure comprising a midsole,
the midsole including:
a first midsole portion comprising:
an upper midsole portion whose upper surface is a planta contact surface contacting a planta of a wearer; and
a lower midsole portion stacked below the upper midsole portion, the lower midsole portion being made of a material having a higher hardness than a material forming the upper midsole portion,
wherein the upper midsole portion includes an upper recessed portion recessed upward from a lower portion of the upper midsole portion, and an upper peripheral wall portion located on inner and outer sides of the upper recessed portion in a foot width direction and protruding downward,
the lower midsole portion includes a lower recessed portion recessed downward from an upper portion of the lower midsole portion, and a lower peripheral wall portion located on inner and outer sides of the lower recessed portion in the foot width direction and protruding upward; and
a second midsole portion disposed at a location corresponding at least to a hindfoot portion of a foot of the wearer,
the second midsole portion being stacked on the first midsole portion in a thickness direction of the midsole and being made of a material having a lower hardness than a material forming the first midsole portion,
the first midsole portion and the second midsole portion having a relatively-low hardness at a location corresponding to a tuber bottom portion of a calcaneus of the foot of the wearer, and a relatively-high hardness in an area ranging from a location corresponding to a sustentaculum tali of the foot of the wearer to a location corresponding to a navicular of the foot of the wearer;
the second midsole portion includes an upper thin plate portion and a lower thin plate portion defining a thin plate shape,
wherein, in a cutting plane along a foot width direction of the midsole at the location corresponding to the sustentaculum tali of the foot of the wearer, the upper thin plate portion and the lower thin plate portion each comprise a different length in the foot width direction,
wherein, in the cutting plane, a center in the foot width direction of one of the upper thin plate portion and the lower thin plate portion which has a shorter length in the foot width direction is located on a relatively lateral side with respect to a center in the foot width direction of the other one of the upper thin plate portion and the lower thin plate portion which has a longer length in the foot width direction,
wherein the first midsole portion includes, at a recessed portion formed at least at one of the upper midsole portion or the lower midsole portion, a space serving as a housing portion for housing the second midsole portion,
wherein in the cutting plane when the midsole is cut along the foot width direction at the location corresponding to the sustentaculum tali of the foot of the wearer, the lower peripheral wall portion on the inner side in the foot width direction has a longer protruding length than the upper peripheral wall portion on the inner side in the foot width direction,
wherein a wall thickness of the upper peripheral wall portion is larger on a medial side in the foot width direction of the recessed portion of the upper midsole portion than on a lateral side in the foot width direction of the upper recessed portion, and
wherein a wall thickness of the lower peripheral wall portion is larger on a medial side in the foot width direction of the recessed portion of the lower midsole portion than on a lateral side in the foot width direction of the lower recessed portion.
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