The BIRKENSTOCK Boston is a true classic that can be easily worn all year round. The Boston has legendary status thanks to its sophisticated and individual design. Modelled on the cork sandal, it is made from the ultra-light and highly flexible EVA synthetic material. The high-quality, odourless EVA has been tested for harmful substances and combines numerous positive attributes: it is very light, highly elastic, shock-absorbing, waterproof and skin-friendly. Anatomically shaped BIRKENSTOCK EVA footbed Upper/lining/sole: one-piece EVA Details: waterproof, washable, ultra-light.