The Yukon hat is made out of sheepskin with a pig suede binding. The Yukon is very warm and versatile, as the ear flaps can be tied up above the head, or flipped down and tied under the chin. Excellent for cold and windy winter days. The Yukon will keep you warm on the coldest days of winter. Sheepskin is impenetrable to wind and the fleece on the inside is nature's amazing insulator. The sheepskin traps your body heat and the soft fleece creates a pocket of warm air for your head and ears.