The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless activewear vest that is designed to keep you warm and comfortable in cold weather. It features UA ColdGear Reactor technology, which adapts to your activity level to provide the right amount of warmth. The vest is made from high-quality materials that are both lightweight and breathable, making it perfect for outdoor activities. It also has a slim fit and a full zip front closure for added convenience. Whether you're hiking, skiing, or simply running errands, this vest will keep you protected from the elements while still looking stylish.