OccuNomix Hot Rods Universal Blue Classic Flame Resistant Winter Liner with chinstrap is made of 6 oz, 100% flame resistant cotton twill for durability. Winter liner with 6.5 oz, modacryliccotton Jersey lining has warming pack pockets, DuPont Thermotex ear barriers, elastic gap eliminators and reflective strips for high visibility. Flame resistance liner comes with hook-loop fasteners for attachment to hardhat and has arc rate of 21 calcm². It is ideal for hardhat liner, welding helmet liner and meets ASTM F1506 standards.