The Sierra Designs Snow Light 800 sleeping bag is a high-performance option for cold weather camping and backpacking. This sleeping bag is designed to keep you warm and comfortable in temperatures as low as 0F. It is constructed with a 800-fill DriDown insulation that provides excellent warmth-to-weight ratio. The hood is also adjustable and has a draft collar to prevent heat loss. The sleeping bag has a tapered shape that maximizes thermal efficiency while minimizing weight. The shell and lining are made of lightweight and durable 20D nylon. This sleeping bag is designed for serious backpackers and mountaineers who want to stay warm and comfortable in extreme conditions