The Birkenstock Zermatt slippers are cosy and comfy. These slippers feature a felt upper with an anatomically-shaped removable footbed. They are the first slippers with a fully removable sole and an ergonomic sole with a standard fit. The upper is in soft anthracite grey wool, making them very pleasant with immediate comfort. They are mules with a slip-on fastening. Uppers: 100% wool, Lining: 100% wool, Cushioning: 100% cork, Sole: 100% latex. Made in Europe.