A manually inflating, lightweight, warm weather pad, the Air Core from Big Agnes lets you rest on 3.25 in. of air chamber comfort and packs small. Warmth rating to 35degF 2degC add a closed cell foam pad in colder temperatures for extra insulation. I beam construction eliminates welded seams to reduce cold spots and ensures quick inflation and deflation, consistent air flow and stability. Larger outside air chambers keep you cradled in the middle of the pad. Durable polyester top and bottom. Internal polyurethane coating. Durable EZ Flate Valve for manual inflation. Store unrolled with valve open to allow moisture to escape and help preserve the integrity of the construction and materials. Includes stuff sack and repair kit repair kit is in a small pocket inside the stuff sack. Each pad is individually inflated and tested. Estimated R Value of 1.