The Birkenstock Zermatt Standard WZ in men's size is a cozy, warm finch whose standard footbed is based on the natural footprint of a foot in sand. The upper is made of soft, warm wool felt, the insole is made of breathable suede and the footbed is made of cork and latex. The anatomically shaped footbed can be removed if you prefer to use one of the other two insoles available from Birkenstock.