The BIRKENSTOCK Boston Pro is a veritable classic that can easily be worn all year round. Its sole is comprised of a midsole made of polyurethane and an anti-slip, dynamic and lightweight outsole that is also made of polyurethane. Anatomically shaped cork-latex footbed PU-coated natural leather upper Suede footbed lining Polyurethane midsole with an anti-slip, oil- and grease-resistant, lightweight outsole Adjustable metal pin buckle