Anatomically shaped BIRKENSTOCK footbed in EVA Upper/lining/sole: one-piece EVA Details: waterproof, washable, ultra lightweight The GIZEH EVA black thong upper from BIRKENSTOCK with a cushioned orthotic footbed provides excellent arch and metatarsal support. Your days will be filled with orthopaedic walking comfort, without compromising good looks and style. This BIRKENSTOCK sandal is a genuine classic, emphasizing the handcrafted and natural look of stylish sandals. A comfort legend and a fashion staple.