HeatGear ® Armour is Under Armour's 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.. Super-light HeatGear ® fabric delivers superior coverage without weighing you down. Strategic mesh panels for added ventilation where you need it. Material wicks sweat & dries really fast. Ergonomic design keeps seams off high abrasion areas & increases durability. Wide, exposed elastic waistband with wordmark detail. Updated gusset design provides ultimate support & comfort. Drop-in Strength Pocket™ on right side for easy storage. Compression: Ultra-tight, second-skin fit.