The Arc'teryx Atom LT Vest is a top-rated sleeveless lightweight thermal packable activewear vest designed for women. Made from a combination of nylon and polyester, this vest offers excellent insulation and breathability. The Coreloft synthetic insulation provides warmth even when wet, making it suitable for various weather conditions. It features a trim fit and articulated patterning for unrestricted movement. The vest also has zippered hand pockets and a stand-up collar for added convenience and protection. With its high-quality construction and attention to detail, this vest is a favorite among outdoor enthusiasts who value performance and style.