Arc Rating: 12 cal/cm². CAT 2. Fabric/Material: 6.5 oz. Westex® UltraSoft® Rib. Flat lock seam for comfort when worn under a hard hat. Inherently flame resistant, FR protection will not wash/wear out. Durable and lightweight. Designed for comfort and flexibility. FR fabric will not melt, drip, or ignite. Single layer UltraSoft®. Made in the USA.