Birkenstock Womens Black Rio Sandal Shoes Size 38/7/7.5 The BIRKENSTOCK Rio is a sporty, elegant sandal with a single strap and an additional backstrap that offers reliable and comfortable grip. It's just the thing for hot summer days! The upper is made from the skin-friendly, hard-wearing synthetic material Birko-Flor®. Fair pre owned condition, cork footbed has wear, see photos From a smoke free home with fast shipping Boho, beach, summer