The Sonora is the perfect backstrap sandal for camping, hiking, traveling, and all of your adventures. Designed with active BIRKENSTOCK fans in mind. It pairs iconic Birkenstock features including an oiled leather upper, classic buckle closures, and suede footbed liners with direct-injection outdoor-ready outsoles for increased traction and durability. The upper is made of especially thick, oiled nubuck leather. Anatomically shaped cork-latex footbed Upper: oiled nubuck leather Sole: polyurethane (PU)