Zenith 0 RegularThe Alps Mountaineering Zenith 0 Regular is a cold weather sleeping bag built for serious backcountry use. Rated to 0F, it's engineered to handle frigid nights in the mountains without sacrificing packability or comfort. The mummy style cut minimizes dead air space for maximum thermal efficiency, while the contoured hood and draft collar seal out cold air when temperatures plummet. Whether you're winter camping, mountaineering, or pushing into