Polartec® Alpha™ Direct is built for warmth without the weight. Designed by Polartec for US Special Forces to use in cold, wet conditions, it regulates heat like a pro, adapting to changing conditions and stop-and-go efforts (like bike riding). The lofted fibers sit on a super-breathable mesh core, seamlessly insulating the body during high-intensity aerobic activities while keeping you warm when less active. We develop products with Polartec® Alpha™ because staying warm shouldn't mean overheating.