So, you've decided to tackle a multi day backcountry expedition in the dead of winter. Nobody in their right mind would do such a thing. We're proud of you. You'll need a little extra insulation to keep you from freezing to death, though. The Mountain Hardwear Wraith Goose Down Sleeping Bag is designed for just such an outrageous undertaking. This waterproof breathable down bag is rated to 20 degrees and features Mountain Hardwear's Q. Shield Technology, which allows the down to maintain its insulating properties even if it gets wet.