FR MATRIALS: Main flame-resistant fabric-11oz 60% Modacrylic 30% Cotton,8% Polyester,2% Anti-static.Mask fabric-10oz 60% Modacrylic 37% Cotton,3% Spandex. ONE SIZE: The size is one size fits all.stretchable rib-knit.Face mask pull-down available when not needed ENSURE SAFETY AT WORK: This balaclava meets or exceeds the standards for HRC2(Arc Rating ATPV 14 Calories/cm2)and the requirements of NFPA2112 Standard on Flame Resistant Garments for Protection of Industrial Personnel Against Flash Fire,2012 Edition.NFPA2112 NFPA70E ASTM F1506 MORE USE TIME: Our balaclavas are made from permanent FR fabric; no matter how many washes, they still maintain flame-retardant performance, recommended to flame-resistant fabric machine-washable warm at a temperature below 104°F(40°C).• MULTI-USE: Made for welders, fitters, ironworkers, electricians, and other industrial workers even at home. It can be used for any kind of industrial and construction work. Our workwear protects you every day and helps you do heavy work.