ColdGear Reactor is intelligent insulation that adapts to your activity level for the right breathability & warmth for what you're doing Fabric has soft, brushed "nodes" next-to-skin for the right warmth that breathes as you move Material wicks sweat & dries really fast Under Armour 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