The Under Armour Women's ColdGear Reactor Vest is a top-selling item in Amazon's women's vest category. This vest is made from a blend of polyester and elastane, offering a lightweight and stretchy fit. It features a full-zip closure for easy on and off, as well as a stand-up collar to keep your neck warm. The ColdGear Reactor Vest is designed with ColdGear technology to keep you warm without adding extra bulk. Its slim and flattering silhouette makes it a stylish choice for outdoor activities or everyday wear.