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National Safety Apparel DriFire Prime Long John National Safety Apparel's DriFire Prime Long John offers an athletic design and cut that is is inherently flame resistant. The fabric is lightweight and breathable for comfort. These long johns also offer odor control technology and moisture management to keep you cool while you work. Features: Inherently flame resistant Athletic design and cut Lightweight breathable fabric for maximum comfort Odor control technology High performance durability & moisture management Tagless shirt collar Off-set, flat-lock seams for comfort Uses drirelease® moisture management technology Specifications: Arc Rating: 4.9 cal/cm² ASTM F1506-10a OSHA 29 CFR 1910.269 NFPA 70E-2015 for Arc Flash CSA Z462-15 for Arc Flash (Canada) HRC: 1 Fabric: 6.5 oz