The BIRKENSTOCK Boston model is a true classic that can be worn effortlessly all year round. Thanks to its refined, individually adjustable design, the Boston has long been a legend. The upper is made of particularly thick, oiled and seamlessly crafted Nubuck leather. Anatomically shaped cork and latex footbed Upper: Oiled Nubuck leather Footbed: Suede Sole: EVA Details: an individually adjustable metal buckle strap.