Durable and versatile down insulated jacket that functions as a warm mid-layer or standalone piece. Arc'teryx Men's Thorium AR Jacket is a durable, flexible piece combining goose down and Coreloft insulation to meet your winter outwear demands. Down Composite Mapping strategically places Coreloft™ synthetic insulation in areas where moisture may buildup; down core gives maximum warmth. Wear it to and from the office, hiking to the final summit of the season, or under a shell while blasting through waist-deep powder in single-digit sunshine. Regardless of how you spend your time, the Thorium jacket protects you from the cold, alone or under a hardshell.