When it's really cold we lose more heat from our head than from any other part of the body. The OTTER BEANIE hat has the same qualities as conventional beanie hats, with the added luxury of being waterproof, windproof and, most importantly, breathable. OTTER hats are constructed from three layers - the inner hat and the breathable membrane are laminated together and the outer layer is loose to allow air to flow inside, consequently removing vapor that has passed through the breathable membrane. Your head stays really warm and dry. Just the same as OTTER waterproof, breathable socks, these hats are made from superior quality yarns and materials which are already trusted by our customers.