The BIRKENSTOCK Boston is a veritable classic that can easily be worn all year round. The Boston has a legendary status thanks to its sophisticated, individual design. Shown in EVA, a synthetic waterproof and lightweight material.?á Super lightweight - great for after the gym or the beach.Anatomically shaped BIRKENSTOCK footbed made from EVAUpper/lining/sole: a single piece of EVADetails: waterproof, washable, ultra lightweightSku: 1027385