A warming device for use in cold environments has a flexible pocket with at least one triangular side gusset for receiving a shoe or boot. The warming device has a receiver for receiving a heat generating packet or fuel stick heating device. The warming device may be firmly attached to a shoe or boot...http://www.google.es/patents/US20040250445?utm_source=gb-gplus-sharePatente US20040250445 - Warmer for feet and toes
Número de solicitud: 10/382,813 Número de publicación: US 2004/0250445 A1 Fecha de presentación: 6 Mar 2003 Patente emitida: US6941681 ( Fecha de emisión 13 Sep 2005)
