The Nike Women's Aeroloft Running Vest is a top-rated sleeveless lightweight thermal packable activewear vest designed specifically for running. Made from a combination of polyester and nylon, this vest offers excellent insulation and breathability. The Aeroloft technology provides lightweight warmth by trapping heat without adding bulk. It features a slim fit and a stand-up collar for added protection against the elements. The vest also has zippered hand pockets for storing small essentials. With its sleek design and performance-driven features, this vest is a favorite among runners who want to stay warm and comfortable during their workouts.