The Arc'teryx Women's Atom LT Vest is a top-rated sleeveless lightweight safety packable activewear vest on Amazon. This vest is made from a combination of nylon and polyester, offering both durability and comfort. It features Coreloft synthetic insulation, which provides warmth even when wet. The vest also has zippered hand pockets, a stand-up collar, and a full zip closure. With its excellent ratings and positive customer reviews, it is a popular choice for women seeking a high-performance and versatile activewear vest.