To some people winter mountaineering is just a pastime. Be it searching for an uncut bowl to tele, a frozen waterfall to climb or a simple visit to the Brooks Range, the Puma Gore Infinium™ has been there, done that! This sizable bag is lofted with down and roomy to boot! 37 ounces of 850+ fill power down lofts this bag to a full 9″ for a rating of minus 25 below! A shoulder girth of 64″ provides room to layer, store clothing or fit to big folk. The inside foot section is sewn with a 2.4 oz. fabric to protect the bag while stowing gear. And the Reverse Differential Hood is roomy, down filled and warm, and totally made with Gore Infinium™. The full down filled collar and both Interlocking Draft Tubes are also completely made with Gore Infinium™ fabric. No place to cut costs! Few continents require anything warmer than our Puma Gore Infinium™!