FR MATERIALS: 7oz Cotton Knit FR Treated, FR Sewing Threads! Clear FR Tag on arms and bottom front.More FR info on Neck Tag About UL Certification. We Attached A Small Sample Inside the Package For customers' Simple FR Try FASHION AND COMFORT: This FR Work Shirt Provides A Perfect And Comfortable Fit, Also Soft And fashionable. We Prewashed/preshrunk It for a Wrinkle-Free Finish. ENSURE SAFETY AT WORK: This garment meets or exceeds the standards for HRC2, Arc Rating ATPV 11.6 cal/cm², and the requirements of NFPA 2112 Standard on Flame Resistant Garments for Protection of Industrial Personnel Against Flash Fire, 2012 Edition. Also NFPA 70E, ASTM F1506, AND CAT 2 Certified! MORE USE TIME: UP TO 100 WASHES. Our shirts have the appropriate level of protective gear and stay effective through numerous washes. You can wear and wash it over and over again for up to 100 times before the FR still works. (NFPA 2112, ASTM F1506, CAT 2) 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 works. Our Workwear Protects You Every Day And Helps You Do Heavy Work.