A shoe insole has a flat base-sole corresponding to a shoe contour. The shoe insole is made of a single piece of foam with a Shore hardness A of 30 to 45, and includes a plurality of integral cushion-elevations formed thereupon. Each of the cushion elevations includes an elevation section which...http://www.google.co.uk/patents/US5784811?utm_source=gb-gplus-sharePatent US5784811 - Shoe insole
