The Boston - narrow fit The Boston clog is equipped with a strap and buckle that can be individually adjusted – and thus provide a perfect fit. The leather footbed also makes them comfortable to wear and creates a pleasant environment for the entire foot. These features make the clog a comfortable companion, whether indoors or out. Premium Materials Every pair of Birkenstocks is made from the highest quality materials. Natural Leather Upper / Classic Footbed - Suede Lined Natural Leather/Oiled Leather has a visible grain and naturally occurring colour irregularities that are not removed in order to preserve the matt surface. 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.