The 100% boiled wool upper and lining are not only super soft and cozy, keep feet constant temperature, wicking away moisture, natural insulator. Kee you warm in cold weather, and cool in warm weather! The latex molded midsole provides arch support. The sturdy rubber outsole provides cushioning and durability. 100% Pure wool (breathable). Anatomically designed latex midsole. Wool lined footbed. Slip resistant rubber sole