The Arc'teryx Women's Atom LT Vest is a highly rated sleeveless lightweight vest known for its exceptional warmth and versatility. 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 has a trim fit and stretch side panels, offering a flattering and comfortable fit. The Atom LT Vest is packable and can be easily compressed into its own pocket for convenient storage. With its wind-resistant and water-repellent properties, this vest is suitable for various outdoor activities. Whether you're hiking, skiing, or simply running errands, this vest will keep you warm and stylish.