Stay Warm - CLASSIC Flame Resistant Full Face Tube Liner - EACH 9.5oz. Modacrylic Soft Rib Knit. Nomex Thread. Meets ASTM F1506. Arc Rating: ATPV = 11.6 cal/cm. NFPA 70E / HRC = 2. Fits snugly over most regular brim hard hats. Flame resistant for the life of the garment