Under Armour's latest evolution in its tactical line is a 100-percent Nomex (fire-retardant) shirt for the streets, the battlefield or any condition where fire-related risks exist. The moisture transport system wicks sweat away from the officer's skin to the outer layer of the garment, keeping him dry, light and comfortable. This shirt is enhanced by ARMOURBLOCK technology, which kills odor-causing microbes. Guaranteed for the life of the product.