The Under Armour Women's ColdGear Reactor Vest is a top-selling sleeveless hooded windproof safety activewear vest. Made from high-quality polyester and elastane blend, this vest offers excellent insulation and breathability. It features a full zip-up front, two zippered hand pockets, and a fixed hood for added protection. The ColdGear Reactor Vest is designed to keep you warm and comfortable during cold weather activities like hiking, skiing, and running. Its lightweight construction and moisture-wicking properties make it a popular choice among outdoor enthusiasts. With its reliable performance and stylish design, it's no surprise that this vest is a best seller on Amazon.