Big Agnes Insulated AXL Air Sleeping Pad. Simply put, this is the most comfortable and lightest ultralight three-season pad you can put in your pack. Designed with gram counters, thru hikers, and technical gear junkies in mind, the Insulated AXL Air combines a high-tenacity proprietary nylon rip-stop shell with internal minimalist construction that maximizes every ounce's stability and comfort. With larger outer tubes, this pad keeps you cradled on top, while the PrimaLoft Silver® insulation, working with the heat reflective barrier, traps body heat and reflects it back so you stay comfy as the temperatures drop. Save room and weight in your pack for other backcountry essentials, since you won't even know the Insulated AXL Air is in there.