Birkenstock Boston Big Buckle Narrow - Cognac Oiled LeatherCognac Oiled Leather The Birkenstock Boston is a veritable classic that can easily be worn all year round. It has a legendary status thanks to its sophisticated, individually adjustable design. The Big Buckle version features a large, elegant pin buckle. The exquisite footbed is fully lined with soft piumato leather, making it exceptionally comfortable. The upper is made from extra thick, oiled nubuck leather with an open selvage finish. Anatomically