The AJO Trapper Hat has a inner liner that is fully waterproof thanks too Extremities' X-Dry technology. The outer layers of the hat have had a water resistant treatment applied to aid in keeping you dry. The inner lining is made from soft Faux Fur to keep your head and ears warm even on the coldest of winter nights. The hat is made from 80% polyester and 20% rayon Faux Fur.