Barely worn (size too big for me). Out of stock at Birkenstock. From the Birkenstock web site: 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®. - Anatomically shaped cork-latex footbed - Upper: Birko-Flor® - Footbed lining: suede - Sole: EVA - Details: two straps, each with an individually adjustable metal pin buckle; backstrap - “Made in Germany”