The Arc'teryx Women's Atom LT Vest is a top-rated sleeveless windproof thermal convertible activewear vest available on Amazon. It is made from a combination of nylon and polyester, offering durability and breathability. The vest features Coreloft synthetic insulation, which provides warmth even when wet. The side panels are made from Polartec Power Stretch fabric, allowing for enhanced mobility and breathability. The vest has two zippered hand pockets and an internal zippered chest pocket for secure storage. With its lightweight construction and versatile design, this vest is a popular choice among outdoor enthusiasts and athletes.