The Arc'teryx Women's Atom LT Vest is a high-performance sleeveless insulated lightweight vest that is designed for active pursuits. It is made from a combination of nylon and polyester, providing excellent durability and breathability. The Atom LT Vest features Coreloft synthetic insulation, which retains warmth even when wet. It also has stretch side panels for enhanced mobility and ventilation. The vest has zippered hand pockets and an internal chest pocket, offering convenient storage options. Whether you're climbing, skiing, or hiking, this vest will keep you warm and comfortable without restricting your movement.