Disclosed is an article of footwear such as a shoe having an inner sole and outer sole which delimit a vacant space of a predetermined height between them, the inner sole having a plurality of ventilating holes for communicating the vacant space with the interior of the shoe. A cushion member made of...http://www.google.es/patents/US4468869?utm_source=gb-gplus-sharePatente US4468869 - Footwear
