The Under Armour Women's ColdGear Reactor Vest is a popular choice for women seeking a sleeveless safety convertible packable activewear vest that offers exceptional warmth and breathability. It is made from a blend of polyester and elastane, providing a comfortable and stretchy fit. The vest features ColdGear Reactor insulation, which adapts to your activity level for the right breathability and warmth. It also has a zippered front closure and two zippered hand pockets, offering easy access and storage. With its lightweight and compressible design, the Under Armour Women's ColdGear Reactor Vest is perfect for cold weather activities.