evo.com | Arc'teryx Down > The Arc'teryx Thorium Jacket is your cold-weather wildcard. 750-fill down brings the serious warmth, while Down Composite Mapping(TM) adds synthetic insulation where moisture can sneak in. Pack it into its stuff sack when you're moving and pull it out when the temperature drops and the mountain gets dramatic. Stuff Sack Included One Zippered Chest Pocket Regular Fit This classic fit is cut comfortably throughout the chest, waist, hip, and thigh. It allows freedom of movement, provides shape, and layers comfortably over or under layers. Synthetic Insulation Coreloft(TM) 80 (80 g/m^2) 100% Polyester Body 30D Nylon Mini-rip with AC Coating / 53gsm 100% Nylon | Arc'teryx Thorium Jacket Men's 2026 - X-Large Brown | Nylon/Polyester