The Arc'teryx Men's Thorium AR Jacket is a down jacket for warmth in a wide range of activity. Don't stay at home just because the temperatures have dropped, you can hike the trails longer when wrapped in the toasty warmth of 750 fill grey goose down. It's lightweight and compressible, so even if you get too warm you can jam it into the included stuff sack. A tall collar protects your neck and the durable Arato™ 30 nylon exterior holds up against your pack straps. Stand alone or midlayer, it's ready for the cold weather.