These winter mitts are built with a heavyweight horsehide leather thats reinforced at the palm and thumb to increase durability, especially in critical high-wear areas. Their Thinsulate lining keeps hands warm in temperatures down to -5 deg F and a Waterstop treatment repels water and oil. A one finger design increases Dexterity and silver strips with Hi-Viz overlay at the cuffs provide enhanced visibility. These heavy duty winter mitts are also designed to offer excellent puncture protection.