The Under Armour Women's ColdGear Reactor Vest is a technologically advanced sleeveless windproof vest that is designed to keep you warm and comfortable during cold weather activities. It features ColdGear Reactor insulation, which adapts to your activity level for the right breathability and warmth. The vest has a slim fit and a full zip closure. It also has two zippered hand pockets and a stand-up collar. The vest is lightweight and breathable, making it perfect for layering. Whether you're running, skiing, or hiking, this vest will provide the necessary protection and performance.