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National Safety Apparel Class 3 Hi-Vis FR Control 2.0 Base Layer T-Shirt The National Safety Apparel Class 3 Hi-Vis FR Control 2.0 Base Layer T-Shirt has an Arc Rating of 4.0 cal/cm². This base layer t-shirt is made of anti-microbial fabric to resist odors and proactively regulate body temperature. Features: 3M Scotchlite FR Silver Segmented Material Anti-microbial fabric to resist odors Inherently flame resistant Moisture Wicking & Breathable More stretch for a customized fit Proactively regulates body temperature Reduces perspiration Tagless shirt collar Standards: ANSI/ISEA 107-2010 Class 3 ASTM F1506-10a CSA Z462-15 NFPA 70E-2015 OSHA 1910.269 Arc Rating: 4.0 cal/cm² Fabric: 5.5 oz. Modacrylic Blend Sizes: Small (BSTJTRC3SM) Medium (BSTJTRC3MD) Large (BSTJTRC3LG) Extra Large (BSTJTRC3XL) 2X Large (BSTJTRC32X) 3X Large (BSTJTRC33X)