This exceptional Bulwark button up work shirt is crafted with 7 oz. flame-resistant Excel fabric; a perfect combination of 88% soft cotton and 12% long-wearing nylon. This ideal combination gives you an FR garment that can take on harsh workdays while still feeling like after-work casual wear. This shirt has an arc rating of ATPV 8.6 cal/cm2, HRC 2 and meets NFPA 2112 standards, meaning it'll stay flame-resistant, and you'll stay safe.