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 synthetic material EVA. The high-quality, odour-free 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 footbed made of EVA Upper/lining/sole: one-piece EVA Details: waterproof, washable, ultra-light "Made in Germany" Upper: EVA Footbed: EVA Footbed material: EVA Outsole: EVA EVA (ethylene vinyl acetate) is a high-quality, very light and elastic material with very good cushioning. As a result, it smooths out slight unevenness in the ground and ensures that every step is gently cushioned.