The Under Armour Women's ColdGear Reactor Vest is a top-selling sleeveless windproof thermal vest designed for active women. It is made from a combination of polyester and elastane fabrics, providing excellent wind resistance and insulation. The vest features a full zip closure and a stand-up collar to keep the cold wind out. It also has zippered hand pockets and a chest pocket for convenient storage. With its innovative ColdGear Reactor technology, this vest adapts to your activity level to provide the right amount of warmth and breathability.