The people at Western Mountaineering are pretty proud of their Caribou MF 35 Degree Down Sleeping Bag, with its MicroLite XP breathable microfiber yarn that's densely woven to create a high thread count material that naturally fends off moisture. Since the fabric's weave is largely responsible for its weather resistance, you don't have to worry about it wearing off, washing out, or de laminating. A DWR coating enhances this water resistance, but without sacrificing the bag's remarkable breathability. All that tech protects the 850 fill down, which stays lofty for toasty warmth. This box baffle mummy bag is cut wider for broader shoulders and a more comfortable fit. It also features a breathable taffeta lining for friction free comfort and mobility. Weighing in at a mere pound and a quarter, this is Western Mountaineering's lightest weight Microfiber Series bag, ideal for summers spent hiking in the mountains or touring the country on two wheels.