【Fabric】7oz 100% flame retardant treated cotton 【Full protection】Arc Rating ATPV 9.3 Cal/cm², Fabrics, buttons, and seams are flame retardant 【Certifications and Parameters】1. UL; 2. CAT Ⅱ 【Application Scenarios】For welders, blacksmiths, electricians and construction workers. Suitable for surveying, construction, roadway highway traffic, engineering, etc... 【Tips❗❗❗ Flame retardant shirts ≠ fireproof clothing】: Our flame retardant shirts are different in nature from fireproof clothing. Flame retardant clothing is added to the surface of the clothing flame retardant or the use of flame retardant fibers (such as aramid), when in contact with fire will slow down the burning speed or self-extinguishing from the fire, but can not completely prevent combustion, will still be charred, suitable for short-term sparks splash occasions SKSAFETY 7oz FR Shirts for Men, Long Sleeve Flame Resistant 100% Cotton Fire Retardant Shirt, Work Welding Shirt CAT2 (Navy 6XL)