The Arc'teryx Women's Atom LT Vest is a top-rated sleeveless lightweight safety thermal activewear vest for women. It is made from durable materials that provide excellent insulation and protection against the cold. The vest features Coreloft synthetic insulation, which retains warmth even when wet. It also has a full zip closure, two zippered hand pockets, and a stand-up collar for added convenience and protection. With its sleek design and reliable performance, this vest has received high ratings from customers on Amazon.