A durable sandal includes a composition rubber sole, a first composition rubber insole, and a unitary leather element including four straps and a second insole section of substantially the same shape as the first insole. Two of the straps having buckles attached thereto are substantially shorter than...http://www.google.fr/patents/US4275512?utm_source=gb-gplus-shareBrevet US4275512 - Sandal structure
