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.