Birkenstock Zurich Sandal 100% Suede Synthetic sole Heel measures approximately 1" Upper material: Suede - Thick and supple leathers without additional dyes to keep the leather breathable, durable and comfortable. Footbed: 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.