Under Armour’s mission is to make all athletes better through passion, design and the relentless pursuit of innovation. The technology behind Under Armour's diverse product assortment is complex, but the program for reaping the benefits is simple: wear HeatGear when it's hot, ColdGear when it's cold, and AllSeasonGear between the extremes. Body: 84% Polyester, 16% Elastane Imported Pull On closure Machine Wash Super-light HeatGear fabric delivers superior coverage without weighing you down Mesh underarm & back panels for strategic ventilation Material wicks sweat & dries really fast Ergonomic design keeps seams off high abrasion areas & increases durability Compression: Ultra-tight, second-skin fit.