The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless reflective convertible packable activewear vest on Amazon. It is designed to provide warmth and comfort in cold weather conditions. The vest features ColdGear Reactor insulation, which adapts to your activity level to provide the right amount of warmth. It has a water-resistant shell to keep you dry in light rain or snow. The vest also has reflective details for enhanced visibility during low-light activities. It is lightweight and packable, making it easy to carry and store. The ColdGear Reactor Vest has a slim fit and a stylish design, making it suitable for both active and casual wear. Whether you're running, hiking, or simply enjoying the outdoors, the Under Armour Women's ColdGear Reactor Vest is a reliable and versatile choice.