The Nike Women's Aeroloft Running Vest is a top-rated packable activewear vest designed specifically for running. It features Nike Aeroloft technology that provides lightweight warmth and breathability. The vest is made from a combination of polyester and nylon, offering durability and comfort. It has a full zip closure, side zip pockets, and a stand collar for added protection. The Aeroloft Running Vest also has reflective elements for enhanced visibility during low-light conditions. With its sleek design and performance-driven features, this vest is highly recommended by runners on Amazon.