HeatGear® Armour is our original performance baselayer—the one you put on first and take off last. So we made it extra comfortable by wicking sweat and stretching so you can move. No athlete can go without it. Keeps You Cool 4-Way Stretch Fast-Drying Super-light HeatGear® fabric delivers superior coverage without weighing you down 4-way stretch material moves better in every direction Material wicks sweat & dries really fast Compression: Ultra-tight, second-skin fit. Style #: 1216007 84% Polyester/16% Elastane Imported