Abstract: On the upper surface of a lower sole transverse grooves reaching the lateral surface of the sole are formed, and an upper sole in which a recess is formed is stacked on the lower sole. In the recess, an elastic block body is fitted so that the upper portions of the block body protrude above the upper surface of the upper sole. On the upper surface of the lower sole, an air-permeable support sheet is disposed so as to support the block body in the recess. The shoe interior and tranverse grooves communicate with one another through the vertical holes in the block body and the support sheet, and when a load is applied to the block body, the vertical holes deform, causing air to flow in and out through the tranverse grooves.

Abstract: A shoe sole having a resilient outsole including a weight for applying a larger-than-normal load on the leg muscles. The outsole has a single recess formed on the upper surface thereof and extending in a lengthwise direction from a toe portion to a heel portion of the outsole. The recess has an outline that is similar to the outline of the outsole and a single weight is embedded in the recess. The single weight comprises a mixture of a resilient material and metallic grains and has an outline that is similar to the outline of the outsole. The weight is formed so as to be relatively thin at the toe portion and relatively thick at the heel portion.

Abstract: A training shoe can apply a larger-than-normal load to leg muscles to strengthen them while maintaining good flexibility, cushioning properties and other necessary properties required for shoes. Regularly arranged weight chambers are formed in a resilient outsole. Weights formed of a mixture of metallic grains and an adhesive are embedded in the weight chambers. A rubber layer is provided between the outsole and a middle sole, and a thick cup-shaped insole is laid on the middle sole to absorb shocks. Also, a fairly thick tongue is provided to protect the instep of a foot.