5. Under Armour Women's ColdGear Reactor Vest

The Under Armour Women's ColdGear Reactor Vest is a top-selling packable activewear vest known for its excellent insulation and breathability. It features ColdGear Reactor technology that adapts to your activity level, providing the right amount of warmth and breathability as needed. The vest is made from a lightweight and durable polyester fabric and has a slim fit design. It also features zippered hand pockets and a stand-up collar for added protection against the elements. Whether you're going for a winter hike or engaging in outdoor sports, this vest will keep you comfortable and stylish.