Gordini's Men's Polar Mitten is insulated with 600-fill down and lined with a combination of Lavawool and ThermoPlush synthetic material to provide excellent warmth for the coldest of conditions. The deerskin leather fingers and thumb provide work-worthy durability while the stretch-woven cuff maintains a low profile. The Aquabloc waterproof breathable membrane protects from moisture while also letting excess heat out. The wool lining placed at the palm helps regulate the temperature of your hand.