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Exploring high altitudes isn't always a comfortable pursuit, but after long days of ice-climbing, ski-touring, or general mountaineering, we can rest assured that at least one part of our day will be cozy with the Rab -5 Degree Neutrino 800 Sleeping Bag. It's filled to the brim with toasty 800-fill down, giving us warmth for high altitudes and cold temperatures without adding a ton of weight. Plus, it's got a special hydrophobic treatment that allows our down to maintain its loft in wet conditions.