NSA's Arc and Flash Fire Rated (Certified to both ASTM F 1891 & ASTM F 2733) Hi-Visibility Rainwear offers protection from the elements, potential arc hazards and open flames. The premium 10 oz/yd� fluorescent Yellow or Orange FR Polyurethane (PU) moisture barrier with an FR cotton weft knit fabric offers lightweight & stretchable comfort that combines a superior arc rating along with hi-vis protection. The FR PU material is durable, flex ble and will not become brittle as it ages.