Birkenstock Unisex Arizona Sandal,Taupe Leather,40 M EU Suede Upper material: Suede - Thick and supple leathers without additional dyes to keep the leather breathable, durable and comfortable. The original Birkenstock footbed - Featuring pronounced arch support, deep heel cup, and roomy toe box. Footbed molds and shapes to your foot. EVA Sole - Flexible, lightweight, durable and shock absorbing.