Whether standing still or roaming the field, the UA Reactor Base Crew provides the right amount of warmth. The soft, brushed grid's fibers hold body heat. As you move, they separate to release excess warmth and enhance breathability, so you don't overheat. And as you sweat, the fibers release moisture so you don't feel damp. For every action, there's Reactor.
Get this ColdGear Reactor Base Layer for true active warmth!