Deuter Exosphere -10C/14F Synthetic Comfort Stretch Sleeping Bag Left Zip LONGDeuter's Exosphere synthetic fibre sleeping bag is the solution for trekkers who want both comfort and an optimum warmth weight ratio. Chambers with elasticated seams keep the sleeping bag close to the skin, allowing for a lot of extra freedom of movement with a stretch of 25% width wise. At the same time, it heats up quickly since the sleeper has to warm up very little air. The 360 degree filling guarantees freedom of movement when sleeping,