The Under Armour Women's ColdGear Reactor Vest is a top choice for women seeking a sleeveless insulated lightweight safety activewear vest. It features ColdGear Reactor technology, which adapts to your activity level to provide the right amount of warmth. The vest has a quilted design and a high collar for added protection. It also has zippered hand pockets and a chest pocket for convenient storage. With its innovative technology and stylish design, it's no surprise that this vest is a best seller on Amazon.