New in Box. Box does not have top. Birkenstock Boston EVA Dusty Blue. Size 40/9 narrow fit. 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. Modeled on the cork sandal, it is made from the ultra lightweight and highly flexible synthetic material EVA. The high-quality, odor-neutral EVA has been tested for harmful substances and combines numerous positive attributes: it is very light, highly elastic, shock-absorbent, waterproof, and skin-friendly. Anatomically shaped BIRKENSTOCK footbed made from EVA Upper/lining/sole: a single piece of EVA Details: waterproof, washable, ultra lightweight Made in Germany Style #1026237