The Birkenstock Unisex Arizona Birko-Flor Nubuck Sandals are a classic design with two adjustable straps and a cork footbed that conforms to the shape of your foot for a truly custom fit. The Birkibuc upper is a durable, synthetic material with a nubuck leather-like texture and soft backing. The footbed is contoured and has longitudinal and transverse arch supports for cushioning and shock absorption. The Birkenstock Unisex Arizona Birko-Flor Nubuck Sandals also feature flexible leather lining which is gentle on the skin and adjusts to the contour of your foot.