Like the Air Core Ultra, the Insulated Air Core Ultra has been redesigned to offer unparalleled comfort at an incredible price. Insulated on both the top and bottom, this durable nylon ripstop pad features a smooth sleeping surface, larger outside tubes, and a high-volume valve for faster inflation and quick deflation, and is still lighter and more packable than the original IAC pads.. . Durable lightweight nylon rip-stop fabric. New double ripstop improves tear strength and durability by 25%. Aviation-grade TPU lamination technology for ultimate durability. WRM HL 841487110383 32304600006 PIACUWL17