OccuNomix G906KH-4X Premium Nomex Flame Resistant Coverall HRC 1, 6 oz, Khaki, 4X-Large Nomex thread and zipper Non-sparking covered snaps One-piece action back with elastic waistband Meets ASTM F1506 6 oz. Flame Resistant treated cotton Soft to the touch, lightweight, cool and comfortable Flame resistant through 25 washes Nomex zipper and thread One-piece action back with elastic waistband