Birkenstock Men's Arizona II Sandals Flexible outsole provides lightweight but durable shock absorption. Two adjustable straps let you customize your fit. Upper is made from the high-grade synthetic material Birko-flor, which wears as well as leather. Leather-like upper, suede sockliner, polyurethane insole, cork and latex midsole, EVA outsole. Care: Lightly brush with a soft to medium brush.