The signature slip-on clog from BIRKENSTOCK - the Boston. A casual-wear staple that is perfect all year round with a simple, adjustable design and contoured cork footbed that forms to the shape of your foot. The upper is made from high-quality, Horween leather. Horween has remained rooted in the craft of hand-made leathers resulting in an unparalleled blend of quality & consistency. It's no surprise that Horween provides the leather for the official NFL footballs. This version also features a special grip outsole providing added durability & traction.