An exercise shoe is capable of adapting its fit while being worn. The shoe has a quarter which is split into an upper portion and a side portion on each side of the shoe. In the gap between the upper portion and each respective side portion is an elastic gore which will stretch to permit the...http://www.google.es/patents/US5765296?utm_source=gb-gplus-sharePatente US5765296 - Exercise shoe having fit adaptive upper
