The Boston clog, a classic from BIRKENSTOCK, is presented here with a soft, high-quality wool felt upper. Thanks to the integrated strap at the upper edge of the upper and a sturdy metal buckle, the clog adapts individually to each foot. Anatomical cork and latex footbed. Upper: wool felt. Oversole: suede leather. Sole: EVA. Details: individually adjustable metal buckle "Made in Germany". Insole: The hypoallergenic, flexible leather insole gently hugs the foot and adapts to its contours. The open-pore surface is particularly thermoactive, keeping feet at a pleasant temperature even during intense physical activity. Footbed material: Cork. Cork is a renewable raw material extracted from the bark of the cork oak tree. This natural product is a thermal insulator with excellent shock-absorbing properties. Outsole material: EVA. EVA (ethylene vinyl acetate) is a high-quality plastic with excellent shock-absorbing properties that is particularly light and elastic.