Under Armour HeatGear® is the best gear out there when you want to feel cool, dry and light! This is the original innovation the UA founder dreamed up. This super-breathable fabric wicks sweat and regulates body temperature so you feel cooler, drier, and lighter than ever. HeatGear Armour® Baselayer is the “second skin” that makes all athletes better. Its soft, lightweight construction delivers relentless support without sacrificing comfort.