New Under Armour Men's Mk1 Sleeveless T-Shirt Black/Gray Size XL

90% Polyester, 10% Elastane Imported Machine Wash HeatGear fabric is ultra-soft & smooth for extreme comfort with very little weight Under Armour’s mission is to make all athletes better through passion, design and the relentless pursuit of innovation Where we started? It all started with an idea to build a superior T-shirt The technology behind Under Armour's diverse product assortment for men, women and youth 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.