The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless hooded lightweight reflective activewear vest designed to keep you warm and comfortable during outdoor activities. It features ColdGear Reactor insulation that adapts to your activity level for the right breathability and warmth. The vest also has a full-zip front, a hood with adjustable drawstrings, and reflective detailing for enhanced visibility. With its high-quality construction and innovative technology, this vest has received rave reviews from customers on Amazon.