Ergodyne N-Ferno 6828 Winter Ski Mask Balaclava, FR Rated, Flame Resistant Modacrylic Fleece FIRE RESISTANT Meets requirements of Performance Specification ASTM F1506; classified CAT2 according to NFPA 70E. Arc-rated; ATPV of 10.6 cal/cm2. Meets the performance reqquirements of EN1149, anti-static FULL HEAD COVERAGE Covers head, face, mouth, and neck for better wind and cold protection ONE SIZE FITS MOST Strechable warm modacrylic cotton fleece comfortably fits most heads to provide the ultimate winter protection and comfort. LIGHTWEIGHT Thermal headwear that fits comfortably under a helmet or hard hat VERSATILE Can be worn as hat, face mask or neck gaiter