The Heat Gear Fire Retardant Shortsleeve Shirt is the latest evolution in Under Armour's Tactical line. Showcasing a 100% Nomex, Fire-Retardant fabric, the 5444 provides protection from heat and flames where fire-related risks exist. Under Armour's signature Moisture Transport System wicks away sweat from your skin to the outer layer of the garment, keeping you cool, light, dry and comfortable. The Fire Retardant Shirt features ArmourBlock technology, which kills microbes that cause bacteria, leaving the garment scent/odor free. Made in the U.S.A.