Get comfort and style in the Women's Birkenstock Boston Soft Footbed Clog. Nubuck leather upper in a clog style with a round toe. Slip-on entry. Adjustable buckle accent. Suede lining with anatomically shaped cork-latex 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..