A shoe with air valve for air refreshing system which includes an air inlet valve and an air outlet valves. The sole has a lateral wall that defines an air chamber and air channels in an inner portion of the sole, and there is an isolating wall separating the air chamber and air channels. The lateral...http://www.google.es/patents/US6305099?utm_source=gb-gplus-sharePatente US6305099 - Shoe with air valve for air refreshing system
