The Arc'teryx Women's Atom LT Vest is a high-performance sleeveless windproof thermal vest designed for active women. It is made from durable nylon fabric and filled with Coreloft synthetic insulation, providing excellent warmth and protection against the wind. The vest features a full zip closure and a stand-up collar for added coverage. It also has zippered hand pockets and an internal chest pocket for convenient storage. With its lightweight and breathable design, this vest is perfect for high-intensity activities in cold weather.