This half-zip fleece pullover features PRIMALOFT ACTIVE EVOLVE technology, a high-performance synthetic insulation used by the U.S. military for superior dynamic thermal regulation. The specialized fiber structure provides excellent warmth retention while actively managing moisture and heat during movement, preventing both overheating during activity and cooling afterward. The soft, stretchy fabric offers unrestricted mobility with a comfortable plush texture, while the adjustable half-zip collar allows for customized ventilation and protection.