BIRKENSTOCK. 1015 084. ZERMATT WOOL FELT. ANTHRACITE. The BIRKENSTOCK Zermatt is the ideal slipper with a one piece upper for perfect moccasin-like comfort. Wear it all year round. This design features our shearling footbed with snug genuine shearling lining to keep your feet cozy when the temperatures drop. The upper is made from soft wool felt.