The boiled wool upper and lining is not only super soft and cuddly, the natural fiber will keep your feet at a constant temperature by wicking away the moisture while acting as a natural insulator. That means keeping warm in cold weather, and cool in warm weather! The latex molded midsole provides structure and arch support for comfort where you need it most. The outsole is double-felted to give you some extra cushion with each step, and durability for long time wear.