Under armour coldblack once youve exerienced black theres no ging back most fabricsmdashparticularly dark coloursmdashheat up amp become uncomfortably warm when excercising or in the hot sun well no more under armours revolutionary coldblackreg technology makes dark colours act more like light colours amp light colours act like nothing else it also has the benefit of protecting your skin from sun damagerevolutionary coldblackreg technology reflects ir amp heat rays