Superior warmth. Outer: 6 oz. 100% Flame Resistant Cotton Twill. Liner: 10 oz. 100% Quilted Cotton twill with 3M™ Thinsulate™ Platinum Insulation FR. Hook & Loop closure & tabs for attachment to hard hat. Nomex® Thread. Horizontal reflective strip on back above neck. Warming Pack Pockets. Meets ASTM F1506. Arc Rating: ATPV = 26 cal/cm2. NFPA 70E / CAT=3. Flame resistant for up to 50 washings.