Mammut

Altitude Down 5-Season Sleeping Bag: -22F Down

If there were a fifth season colder than winter, then Mammut's Altitude Down 5-Season Sleeping Bag would be warm enough. The warmest bag in Mammut's massive collection, the Altitude Down thrives in conditions as cold as -22 degrees Fahrenheit. Mammut fabricated it for rowdy expeditions, with a waterproof, breathable shelterTX membrane and durable nylon fabrics to fend off winter's wrath.  For warmth, Mammut stuffed the Altitude in the lightest, loftiest, most packable down insulation that the Mammoth-branded company has to offer. There's a removable, fleece lining near the foot section because toes are generally the first to go when it comes to frostbite.