A construction for a shoe, particularly an athletic shoe such as a running shoe, includes a sole that conforms to the natural shape of the foot, particularly the sides, and that has a constant thickness in frontal plane cross sections. The thickness of the shoe sole side contour equals and therefore...http://www.google.co.uk/patents/US5544429?utm_source=gb-gplus-sharePatent US5544429 - Shoe with naturally contoured sole
