Birkenstock Boston Black Smooth Leather Regular 0060191 Narrow 0060193 Premium Materials Every pair of Birkenstocks is made from the highest quality materials. Smooth Leather Upper / Classic Footbed - Suede Lined Smooth Leather has a very fine grain so the surface feels smooth. The leather is durable and easy to clean. The essence of all our shoe models is the original BIRKENSTOCK footbed, which is inspired by the natural imprint of a foot in the sand and feels just like walking barefoot. Its anatomical shape ideally supports the natural walking action of your foot. Your feet, joints and back are protected. At the same time, your foot and leg muscles are exercised, and your health and well-being benefit as a result. The Boston The BIRKENSTOCK Boston is a practical classic that can easily be worn all year round. The Boston has a legendary status thanks to its sophisticated, individual design. Slip them on and you're off! The Boston clog is equipped with a strap and buckle that can be adjusted across your instep– and thus provide a perfect fit. The anatomically shaped footbed and roomy toe box makes them comfortable to wear creating a pleasant environment for the entire foot. These features make the clog a comfortable companion, whether indoors or out.