The Under Armour Women's ColdGear Reactor Vest is a top-rated choice for women's insulated activewear. It is designed with ColdGear Reactor technology, which adapts to your activity level to provide the right amount of warmth and breathability. The vest is made from a blend of polyester and elastane, offering a comfortable and stretchy fit. It features a full-zip front closure and a stand-up collar for added protection against the cold. The vest also has zippered hand pockets for secure storage. Whether you're running, hiking, or engaging in other outdoor activities, this vest will keep you warm and comfortable.