Birkenstock Women's Florida Sandal Black Leather Size 39 M EU Leather Synthetic sole Upper material: Leather  Thick yet supple leathers without additional dyes to keep the leather breathable, durable and comfortable. Footbed: 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.