Birkenstock Unisex Basel Clog 100% Fabric and leather Synthetic sole Heel measures approximately 0.75" Upper material: Suede - Thick and supple leather and wool 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.