The Birkenstock Zermatt Rivet 1014932 are the first slippers with a fully removable sole. They feature an ergonomic sole with a standard fit, and the upper is crafted from soft anthracite grey wool, providing immediate comfort. These mules are a slip-on design, made in Europe. Uppers, lining, cushioning, and sole are all made from natural materials: wool, cork, and latex. This variant is for adults, unisex, made of wool, and is a UK size 3.