An inflatable cushioning device, and a process for making it, having a fluid-tight, enclosed area that is bordered by a first generally flat surface, a second generally flat surface and at least one bellowed surface, such that the bellowed surface will collapse when a force is applied. The cushioning...http://www.google.co.uk/patents/US7409780?utm_source=gb-gplus-sharePatent US7409780 - Bellowed chamber for a shoe
