Birkenstock London Oiled Leather features a completely enclosed leather shoe with adjustable strap. Upper material: Oiled 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, a deep heel cup and a roomy toe box. Covered with a suede liner. The footbed molds and shapes to your foot. Sole material: EVA - Flexible, durable, lightweight, shock resisting soling material.