Ergodyne CORE Performance Work Wear 7470 Base Layer FR UnderWear, Gray, 3X-Large 5.8-ounce, 90% Cotton 10% Spandex (Pyro safe by Ante) Arc-rated; ATPV rating of 7.4 call/cm2 Moisture wicking material for multi-climate comfort Anti-stink treatment helps workers remain unscented