The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless insulated waterproof packable activewear vest on Amazon. It is made with a lightweight and breathable fabric, filled with synthetic insulation for warmth. The vest features a water-resistant finish, keeping you dry in light rain or snow. It also has a sleeveless design, allowing for easy layering and freedom of movement. The ColdGear Reactor Vest has a slim fit and a stylish design, making it suitable for both outdoor activities and everyday wear. It is also packable, making it easy to carry and store. With its high-quality construction and reliable performance, this vest is a popular choice among active women.