The Under Armour Women's ColdGear Reactor Vest is a top-rated packable activewear vest designed for cold weather. It features UA ColdGear Reactor intelligent insulation that adapts to your activity level for the right breathability and warmth. The vest is made from a combination of polyester and elastane, providing stretch and comfort. It also has a secure zippered hand pocket and a stand collar for added protection. With its innovative technology and excellent performance, this vest is highly recommended by customers for outdoor activities in chilly conditions.