The Drift 15 sleeping bag is designed for adventurers that like to head out even when it's cold. DownTek® down will keep you toasty warm down to 15°. The Halo Neck Collar traps all your body heat inside the bag while not allowing any cold air in that might disturb your night's sleep. All Brooks-Range sleeping bags are design for one goal: To keep you comfortable while sleeping. Our bags have a streamed line design, we only add features that help increase the bag warmth.