A foot comforter apparatus is adapted to ventilate, and/or may cool or heat the foot. The comforter may have a heat exchanger and has a hollow foot supporting chamber provided with an upper wall and a lower wall. The foot supporting chamber is at least partially compressible to permit cyclic application...http://www.google.fr/patents/US4800867?utm_source=gb-gplus-shareBrevet US4800867 - Foot comforter
