The Arc'teryx Atom LT Vest is a top choice for women's sleeveless lightweight safety packable activewear vest. This vest is made from a blend of nylon and polyester, providing both durability and comfort. It features Coreloft synthetic insulation, which retains warmth even when wet. The Atom LT Vest also has a zippered front, two hand pockets, and a high collar for added protection. With its sleek design and reliable performance, it's no wonder that this vest is a best seller on Amazon.