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. The upper is made from extra thick, oiled nubuck leather with an open-selvage finish.. Anatomically shaped cork-latex footbed. Upper: oiled nubuck leather. Footbed lining: suede. Sole: EVA. Details: one strap with an individually adjustable metal pin buckle. “Made in Germany”. Materials:. Upper material: Oiled leather. Oiled leather is one of Birkenstocks' favourite types of leather. Its oily waxed surface makes for a unique colour effect and develops a beautiful patina. The oily finish of their natural leather products results in colour variation, making each and every pair unique.. Insole: Natural leather. Natural leather can be recognized by its untreated surface. BIRKENSTOCK purposely does not treat surface grains and other characteristic features. BIRKENSTOCK uses sturdy leather with a thickness of 2.8 to 3.2 millimetres as upper material.. Footbed material: Cork. Cork is a sustainable material extracted from the bark layer of the cork oak. This natural product is insulating and offers very good cushioning.. Outsole: EVA. EVA (ethylene vinyl acetate) is a high-quality, very light, elastic material with extremely good cushioning. As a result, it smooths out slight irregularities in the floor and ensures that every step is softly cushioned.