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The DEWALT DST921 Class 2 modacrylic FR long-sleeve t-shirts will help protect workers with a brand name they know and trust. The DEWALT FR t-shirts are built in the USA with global materials to provide Guaranteed Toughâ„¢ protection. Available in short or long sleeve, the jersey knit, modacrylic cotton polyester blend material offers flame resistant properties required by ANSI 107-2010, as well as certified background and reflective material. Meets ASTM F1506 standards with an ARC rating of 10.0 cal/CM2.