Air, open cell foam and PrimaLoftTM Synergy synthetic insulation * I-Beam construction eliminates welded seams to reduce cold spots and ensures quick inflation/deflation, consistent air flow and stability * Durable, light-weight nylon rip-stop top and bottom. Internal heat reflective polyurethane coating. Durable inflation valve * Includes stuff sack and repair kit. The repair kit is in a small pocket on the inside end of the stuff sack. It"s sort of hidden, so look twice * Estimated R-Value of 6. Rating of 0F