X-Static synthetic insulation with the natural performance of silver filament to enhance thermodynamic, anti-microbial and anti-odor properties * Estimated R-Value of 4.5. Rated at 15F. Internal polyurethane coating. Durable inflation valve * Alternating I-Beam construction creates a smoother, more comfortable feel. Durable, light-weight nylon rip-stop top and bottom * 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 * Larger outsider air chambers keep you cradeled in the middle of the pad