Lovely Violets! The 100% boiled wool upper and lining of the Viola are not only super soft and cozy, the natural fiber will keep your feet at a constant temperature by wicking away the moisture while acting as a natural insulator. This means keeping you warm in cold weather, and cool in warm weather! The latex molded midsole provides arch support for comfort where you need it most. The outsole is double-felted to give you some extra cushioning and durability.