What's it do? HeatGear® 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 matter what. Product DNA - Super-light HeatGear® fabric delivers superior coverage without weighing you down - Material wicks sweat & dries really fast - 4-way stretch material moves better in every direction - Ergonomic flatlock seams deliver a comfortable, chafe-free fit - Compression: Ultra-tight, second-skin fit. - Style #: 1365459 - 87% Polyester/13% Elastane - Imported