The Arc'teryx Women's Atom LT Vest is a highly rated sleeveless activewear vest available on Amazon. It is designed to provide lightweight and breathable insulation during outdoor activities. The vest is insulated with Coreloft synthetic insulation, which offers excellent warmth even when wet. It features a full-zip front closure and a high collar for added protection against the cold. The vest also has zippered hand pockets for secure storage of small essentials. With its lightweight and compressible design, this vest can be easily packed into your backpack and worn whenever needed. Whether you're hiking, climbing, or skiing, this versatile vest is a great addition to your activewear collection.