The Arc'teryx Women's Atom LT Vest is a versatile and lightweight sleeveless vest that is perfect for layering in cold weather. It is made from a combination of nylon and polyester fabric, which is both breathable and water-resistant. The vest features Coreloft synthetic insulation, which provides warmth even when wet. It also has zippered hand pockets and an internal chest pocket for convenient storage. The vest's slim fit and articulated construction allow for unrestricted movement. With its high-performance materials and thoughtful design, the Arc'teryx Women's Atom LT Vest is a top seller on Amazon.