Birkenstock unisex sandals NWT has some glue next to sole see pictures for referencesSize L 11/ M 9Color blackDescriptionThe 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®.Tech SpecsAnatomically shaped cork-latex footbedUpper: Birko-Flor®Footbed lining: suedeSole: EVADetails: two straps, each with an individually adjustable metal pin buckle; backstrap