Whether you're pounding it out up to an alpine lake or meandering through red rock corridors in the desert, the AERIE UL PRIMALOFT Sleeping Pad is the ideal for light weight comfort. Insulated with PRIMALOFTÂ® Hi-loft insulation, the AERIE UL still manages to weigh just over a pound and pack down to the size of a 1 liter water bottle. The internal I-beam construction helps the pad maintain its structure even as you roll around on its 2.5 inch PRIMALOFTÂ® stuffed air cushion. "Bumper" side baffles help keep the restless on-board at night. An Aorta Two Valve inflation system ensures easy inflation and even easier deflation once your rested and ready to go.