The Birkenstock Madrid sandal has a strap, buckle, and contoured cork footbed. These simple, iconic slides are still the purest expression of the minimalist tradition that guides Birkenstock design. They have a durable, synthetic upper material with a leather-like finish and soft backing. The contoured cork footbed conforms to the shape of your foot and has pronounced arch support, a deep heel cup, and roomy toe box. They also have a lightweight EVA sole for cushioning and shock absorption. These sandals have a narrow fit and should be avoided in extreme heat. They have a flat heel shape.