4.5 oz. fabric made with Dupont™ Nomex® IIIA brand fibert is a protective aramid fiber which is permanently flame resistant with excellent chemical resistance. ATPC 4.5 cal/cm2. Thread and Zipper made of Nomex® IIIA brand fiber. Non-sparking covered snaps. One-piece action back with elastic waistband. meets or exceeds NFPA 70E, 1971, 1975, 1977, ASTM F1506 Arc thermal performanced tested. HRC level 1. Pockets: 2 chest, 1 tool pocket, 2 back, 2 hip, 2 front pass throughs with snaps. Available in Navy and Orange online. Call to place an order in Royal Blue or Khaki.