HeatGear Armour is UA's original performance baselayer, the layer you put on first and take off last. It's tight to wick away sweat and quick-drying to keep you cool. No athlete can go without it. The super-light HeatGear fabric delivers superior coverage without weighing you down, four-way stretch construction moves better in every direction. Ergonomic flatlock seams deliver a comfortable, chafe-free fit and super-soft jacquard elastic waistband with a rise that sits just right on your hips. 87% Polyester, 13% Elastane.