NAVY - X-LARGE - Saf-Tech FR Work Shirt - 4.5oz. NOMEX IIIA Flame Resistant Fabric - Oil Field Ready - HRC 1 - ATPV 4.8 cal/m2 - Great Lightweight Shirt Perfect for Hot Weather - MADE IN THE U.S.A. FR Flame Resistant work shirt - MADE IN THE U.S.A. 4.5oz. 100 pct. NOMEX IIIA fabric with Nomex thread FR for the Life of the Shirt HRC 1 - ATPV=4.5 cal/m2 The finest FR workshirt you'll ever own - Lightweight, Perfect for hot weather