The ScentLok BE:1 Trek Heated Base Shirt in Blackout is a revolutionary base layer designed for serious hunters who demand warmth, comfort, and total scent control. Built with Carbon Alloy, Silver Alloy, and Fusix technologies, this ultra-soft merino wool blend shirt delivers maximum odor adsorption, bacteria defense, and stretch performance. Integrated heating elements provide three levels of on-demand warmth, activated by an easy one-button control and powered by a built-in USB cable compatible with any 5V/2A battery (not included). The blackout design is ideal for blind hunting, and the shirt&';s moisture-wicking treatment ensures dry, next-to-skin comfort in all conditions. The Trek Heated Base Shirt is the ultimate cold-weather base layer for focused, scent-conscious hunts.