N Ferno 6876 FR Winter Hard Hat Liner + FR Mouthpiece Kit 2 Layer Cold Weather Gloves Book meets U Imprinted with the official Book meets U FR heavy weight durable indigo denim Both the N Ferno 6882 FR Hard Hat Thermal Liner and N Ferno 6872 FR Thermal Mouthpiece have a fire resistant outer shell and lining made of 60% modacrylic cotton and 40% cotton twill blend to stand up to tough environments and meets requirements of performance specification ASTM F1506 The N Ferno 6876 2 Layer FR Winter Hard Hat Liner w Mouthpiece Kit includes a winter hard hat liner with 2 layers of insulation and FR technology to meet ASTM F1506 and also a thermal mouthpiece attachment for full face coverage