The Arc'teryx Women's Atom LT Vest is a popular choice among women who prioritize lightweight and breathable sleeveless thermal packable activewear vests. This vest is made from a combination of nylon and polyester, providing both durability and insulation. It features Coreloft synthetic insulation, which retains warmth even when wet. The Atom LT Vest also has a DWR (Durable Water Repellent) finish, making it water-resistant and suitable for various weather conditions. With its minimalist design and excellent performance, this vest is perfect for layering or wearing on its own during outdoor activities.