The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless hooded packable activewear vest on Amazon. This vest is designed to provide warmth and comfort in cold weather conditions. It features UA ColdGear Reactor technology, which adapts to your activity level to provide the right amount of breathability and warmth. The vest is made from a combination of polyester and elastane, with a water-resistant finish to repel light rain or snow. It has a full zip closure, secure hand pockets, and a hood for added protection. With its high ratings and positive reviews, this Under Armour vest is a popular choice among women who prioritize performance and functionality.