A classic to wear all year long: the Men's Birkenstock Boston Soft Footbed Clog. Suede or leather upper in a comfort clog style with a round toe. Slip-on entry. Adjustable buckle accent. Original BIRKENSTOCK soft anatomically-shaped footbed. Durable EVA outsole. Birkenstock is committed to environmentally friendly operations. A high proportion of the natural materials that we use are from sustainable sources: cork natural latex jute leather wool felt copper and brass are among our most important materials.. Birkenstock Men's Boston Soft Footbed Clog Shoes