Flame Resistant FR Light Weight Athletic Shirt 100% cotton FRC. Light Weight. Affordable. Flame resistant fabric 6.5 oz FR knit: 100% cotton Raglan athletic style sleeves increase range of motion 1 1/2" longer than other t-shirts Ratings for flame retardant or flash fire: CAT 2 ATPV 10.6 NFPA 70E NFPA 2112