The Under Armour Women's ColdGear Reactor Vest is a popular choice among women seeking a sleeveless lightweight safety thermal activewear vest. It is made from high-quality materials that provide excellent insulation and protection against the cold. The vest features Under Armour's ColdGear Reactor technology, which adapts to your activity level to provide the right amount of warmth. It also has a full zip closure, two zippered hand pockets, and a stand-up collar for added convenience and protection. With its innovative technology and reliable performance, this vest has received positive reviews from customers on Amazon.