Incredibly stylish and comfortable, the Sydney BS slide sandals from Birkenstock will make you stay on the move all day long. Encouraging foot health and maintaining a natural posture while walking, the Sydney open-back sandals are light and summery companion that offers outstanding comfort. Durable Birko-Flor synthetic upper. Soft fleece lining on the underside of the upper. Anatomically correct, suede lined, natural cork-latex footbed. Two adjustable straps with metal buckles for a flexible fit. Flexible, lightweight and shock-absorbing EVA sole.