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 Where we started? It all started with an idea to build a superior T-shirt The technology behind Under Armour diverse product range is complex, but the program to reap the benefits is simple: wear HeatGear when it's hot, ColdGear when it's cold, and AllSeasonGear between the extremes