Incredibly stylish and comfortable, the Madrid BS sandals from Birkenstock will make you stay on the move all day long. Encouraging foot health and maintaining a natural posture while walking, the Madrid open-back sandals are light and summery companion that offers outstanding comfort. Premium synthetic upper for durability. Soft textile lining for abrasion-free wear. Anatomically correct, textile lined, natural cork-latex footbed. Adjustable buckle strap for a flexible fit. Flexible, lightweight and shock-absorbing EVA sole with bone pattern.