The Birkenstock Boston has been going strong after 30 years and is a wardrobe basic year-round. Enjoy the closed-toe comfort and support that the Boston clog is known for. This clog has an adjustable strap for fit. This version also has a Soft Footbed, a foam layer is inserted between the cork layer and the suede liner for added comfort. Birkenstock is committed to environmentally friendly operations. A high proportion of the natural materials that they use in this item are from sustainable sources, like cork, natural latex, jute, leather, and brass. This version of the classic features an additional foam layer for cushioning, and the soft footbed offers extra comfort plus go-all-day support.