The BIRKENSTOCK Boston is a true classic that may be worn at any time of year. Thanks to its innovative, individually customizable design, the Boston has a legendary reputation. Smooth suede leather upper. Suede with a lining of shearling for comfort. Non-removable Shearling lined footbed for cushioning and warmth. Buckle closure for adjustable fit. Lightweight EVA sole for increased traction, cushioning and flexibility.