For snow camping, mountaineering, ice climbing and other 4-season activities, you need a sleeping bag you can count on. The North Face Dark Star 0°F sleeping bag is part of North Face’s Summit Series, tested by some of the most skilled athletes in the world in the most demanding conditions. This bag uses synthetic Climashield® Neo insulation that provides warmth even when wet and has a 20D Pertex shell for weather-resistance. The shape of this bag is an expedition fit and it has a vaulted footbox for comfort; this shape traps heat. The Dark Star’s compression sack even doubles as a summit pack; a nice added bonus. This bag weighs in at 4 lbs and has a great price tag for a 4-season sleeping bag. For a great quality bag that can stand up to harm mountain cold and weather, the North Face Dark Star is a fantastic choice.