The Montbell Seamless Down Hugger 900 #1 makes sleeping under the open sky a lot of fun. The Japanese manufacturer is introducing a major innovation with this warm three-season sleeping bag: It does away with the chamber system to keep the down in place. Instead, there is a new invention: the spider baffle system. So-called spider yarns hold the feathers loosely in place. This allows the down to develop its full fluffiness. This means you get at least as much, if not more, warmth with less filling quantity. Cold bridges at the chamber seams are also a thing of the past. With the spider baffle system, the feathers can be hiked by up to 20 percent. It is therefore essential to give the sleeping bag a good shake before use. In this high-tech down sleeping bag for spring, summer and autumn, Montbell retains the proven super spiral stretch system with a close-fitting inner sleeping bag and individually adjustable neck collar. All this together gives you even more warm nights under the stars.