Classic two-strap sandal with fully adjustable straps. The go-to style in any situation. Made of Birko-Flor,a synthetic material that looks like leather, but has a fleecy underside. Soft footbed: A foam layer is inserted between the cork layer and the suede liner of the original Birkenstock footbed. Millions of microscopic air bubbles cushion your feet while providing moderate arch support. EVA sole flexible, lightweight, durable and shock absorbing.