The N-Ferno 6893Z Zippered Balaclava Face Mask provides warmth for extreme cold, as well as the option for lightweight protection from bumps, scrapes, bruises and other minor head injuries. Wear alone as a balaclava face mask or open the top zippered compartment to add the Skullerz 8945 Universal Bump Cap Insert (sold separately) for work in cramped spaces. This winter liner is made of stretchable polyester fleece for a comfortable snug fit that traps heat, plus a long length design that easily tucks into jackets for increased warmth and wind protection in extreme cold. A reflective accent keeps workers safe and seen. When worn without the bump cap insert, it makes for a great thermal layer under hard hats or helmets. Ideal for construction, baggage handling, mechanics, freight, mining, oil & gas, warehousing, refrigeration and more. Also great for outdoor sports like skiing, snowboarding, trekking, mountain climbing and hunting.