The Sierra Designs Cloud 20 Degree sleeping bag borrows the innovative zipperless design of the award-winning Backcountry Bed but offers up a lighter weight, streamlined design that is ideal for 3-season backpacking. Renowned for their efficiency in retaining heat and compressible properties, the feathers and fibers of down have an incredibly soft, comfortable feel, and despite advances in synthetic materials, continue to provide the best warmth-to-weight ratio of any insulation available. The one inherent weakness of down insulation is that it loses much of its ability to maintain warmth when it gets wet, but the bag's 800-fill DriDown performs differently. Employing a unique, innovative polymer application, DriDown actually creates a hydrophobic finish on each individual plume of down. This treatment results in insulation that stays dry longer, dries faster, and better retains its insulating qualities when wet than traditional, untreated down. A 15D nylon ripstop shell further protects the insulation from the elements. By eliminating zippers, the bag saves weight, reduces noise, and gives you the ability to move around. An integrated front 'comforter'grants access to the bag, seals efficiently to maximize warmth, and can be folded down for venting if temperatures rise. A zipperless, self-sealing foot vent allows you to extend your feet out of the bottom of the bag in balmy weather but effectively retains heat when temperatures require it. A sleeve on the bottom of the bag lets you pair it directly to a sleeping pad (pad not included) to even better create a bed-like sleeping experience. The Sierra Designs Cloud 20 Degree sleeping bag is available in Regular (fits up to 6'0') and Long (fits up to 6'6') sizes. A stuff sack and storage sack are included.