The N-Ferno 6829 Freezer Balaclava Face Mask features two layers of high quality, stretchable acrylic rib knit material for protection from mild to extreme cold weather environments. The dual-layer, heat-trapping acrylic material provides consistent warmth in cold storage and cold environments without being overly bulky. The longer length offers extra coverage for your head and neck and can be tucked into your jacket to seal out the cold. Reflective accents enhance visibility at night