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. The upper is made of extra thick, oiled nubuck leather with an open selvedge finish. Anatomical footbed made of cork and latex. Upper: oiled nubuck leather Insole lining: suede Sole: EVA Details: an individually adjustable strap with metal buckle.