A one-piece, washable and sterilizable plastic shoe comprising a lower part with a top on which the foot bears and a bottom enveloping an outsole and a heel, and an upper part having ventilating openings in a substantially vertical lateral area, these openings having upper and lower outer boundary edges...http://www.google.es/patents/US4476600?utm_source=gb-gplus-sharePatente US4476600 - One-piece, washable and sterilizable plastic shoe
