Patent ID: 8713821

Claim:
An athletic shoe suitable for exercise comprising a sole for absorbing shock of landing and an upper for covering an instep of a foot, the sole comprising a plurality of layers, wherein: the upper defines a first opening out of which the foot sticks upwards during wearing and a second opening being placed anterior to the first opening and opening in an upper surface of the instep and covered with a tongue, the two openings being continuous with each other in a longitudinal direction, and the upper comprises: a medial side surface of the upper which covers a medial side of the foot; a lateral side surface of the upper which covers a lateral side of the foot; and a medial side stretchable part formed on the medial side surface of the upper from a top surface of the sole to the second opening, wherein the medial side stretchable part has a Young's modulus along a lengthwise direction of the foot less than a Young's modulus of a remaining portion of the medial side surface of the upper, wherein all remaining portions of the medial side surface of the upper and a part opposite to the medial side stretchable part in the lateral side surface are covered by a material whose stretching and contracting property is less than that of the medial side stretchable part, wherein the medial side stretchable part is provided on the medial side of the foot at a location corresponding substantially to Lisfranc's joint, and wherein both a front edge and rear edge enclosing respective sides of the medial stretchable part extend in a rear direction of the foot as the front edge and rear edge get close to the sole from the second opening, and upper ends of the front edge and rear edge are positioned anterior to a front end of the first opening, wherein a part corresponding to a distal caput of a fifth metatarsal bone in the lateral side surface is covered with a material being substantially more difficult to stretch than the medial side stretchable part, and wherein the medial side stretchable part is provided from the top surface of the sole to the second opening and is in contact with the second opening.