Cold weather and FR protection combine in the FR knit winter hat. Designed for cold weather conditions, this hat features a double layer knit for warmth without the weight and has a stretchable fit for added comfort. This winter hat has a 35 cal/sq-cm arc rating, is made with FR fabric that will not melt, drip or ignite and is Inherently flame-resistant so the FR protection will not wash or wear out. National Safety Apparel® Winter Hat, Flame-Resistant Regular, Black, DuPont™ Nomex® Fabric