The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless insulated lightweight safety activewear vest that is designed to keep you warm and comfortable in cold weather. This vest features UA Storm technology, which repels water without sacrificing breathability. It has ColdGear Reactor insulation, which adapts to your activity level for the right breathability and warmth. The vest also has a stand collar and zippered hand pockets for added convenience. It is made from a blend of polyester and elastane, providing a comfortable and stretchy fit. With its innovative technology and functional design, the Under Armour Women's ColdGear Reactor Vest is a popular choice among women who want to stay warm and stylish during outdoor activities.