The Under Armour Women's ColdGear Reactor Vest is a top-rated sleeveless waterproof activewear vest that offers exceptional warmth and comfort. Made from a blend of polyester and elastane, this vest features a water-resistant finish to keep you dry in light rain or snow. It is insulated with ColdGear Reactor technology, which adapts to your activity level for the right breathability and warmth. The vest also has a slim fit and a stylish design, making it a versatile choice for outdoor activities. With its high-quality construction and reliable performance, it's no wonder that customers love this vest on Amazon.