When facing blazing heat, Under Armour HeatGear works overtime to keep officers cool. Designed to be worn under a vest or uniform, it features a Moisture Transport System that wicks perspiration from the skin to the outer layer of the garment, allowing the body to regulate its temperature in any climate. Made from 79-percent Cationic Polyester and 21-percent Elastane, this garment distributed by Ranger Joe's International slides over an officer's body like a second-skin, delivering compression without restriction.