Black Nomex Hood Balaclava. Certified to SFI 3.3 standards. • 100% Nomex® construction for maximum safety. • Interlock wave construction for enhanced comfort. Stitched 100% Nomex thread. Flame-retardant underwear is essential for providing the last line of defence in a fire. The extra layer of flame retardant material is an item that no driver should ever have to use, but, if you need it, you will be glad you have it