There is nothing worse than waking up in the middle of the night with half of your body on the cold tent floor or a zipper pressing against your face. In order to create a more solid foundation that keeps you comfortably on your sleeping pad all night, many outdoor brands have moved to control the design of both the pad and sleeping bag. Therm-A-Rest started the process with a line of down blankets and top bags, but now plans to round out their sleep system collection with a full line of sleeping bags for Fall 2013.