This version of the Boston clog, a classic BIRKENSTOCK model, comes with a shaft in soft, high-quality woolen felt. The clog can be adapted to all feet thanks to a strap on the upper edge of the shaft and a sturdy metal buckle. Anatomically shaped cork-latex footbed. Upper: wool felt. Lining: suede. Sole: EVA. Details: individually adjustable metal pin buckle. "Made in Germany". Insole: Suede. The flexible leather lining, which is gentle on the skin, nestles up softly against your foot and adjusts to its contour. The open-pored and thus very breathable surface makes for a comfortable foot climate, even during more strenuous physical activity. Footbed material: Cork. Cork is a sustainable material extracted from the bark layer of the cork oak. This natural product is insulating and offers very good cushioning. Outsole: EVA. EVA (ethylene vinyl acetate) is a high-quality, very light, elastic material with extremely good cushioning. As a result, it smooths out slight irregularities in the floor and ensures that every step is softly cushioned.