The Arc'teryx Women's Atom LT Vest is a top-rated sleeveless safety convertible packable activewear vest that offers exceptional warmth and breathability. It is made from a combination of nylon and polyester, providing both durability and comfort. The vest features Coreloft synthetic insulation, which retains warmth even when wet. It also has zippered hand pockets and an internal chest pocket for secure storage. The vest is convertible, allowing you to pack it into its own pocket for easy transport. With its innovative design and reliable performance, the Arc'teryx Women's Atom LT Vest is highly recommended by customers.