Pure performance meets cold-weather comfort as the Arc'teryx® Thorium Jacket delivers serious warmth without any unnecessary weight. Filled with RDS-certified down, it delivers effective warmth while staying impressively light and packable. The abrasion-resistant Arato™ 30 nylon shell adds durability, while an FC0 DWR finish helps shed light moisture. A lightweight, down-proof 20D Arato™ liner made with bio-derived material helps reduce petroleum use. Down Composite Mapping™ places Coreloft® synthetic insulation in moisture-prone areas for added performance where you need it most. Designed with a hooded neck, zippered front closure, long sleeves, and an adjustable straight hem, it offers a comfortable, adaptable fit. Zippered hand pockets, an internal pocket, and an internal dump pocket keep essentials close. When adventure calls, simply pack it into the included stuff sack and go.