The Under Armour Women's ColdGear Reactor Vest is a popular choice for women seeking a sleeveless lightweight vest with high-visibility thermal activewear features. This vest is designed to adapt to your body's temperature, providing optimal warmth and comfort. It is made from high-quality materials that offer excellent insulation. The vest also features a stylish design and a flattering fit, making it a favorite among active women. Whether you're going for a run or participating in outdoor sports, this vest is a reliable choice.