Big Agnes Insulated Air Core Sleeping Pad PrimaLoft Synergy: synthetic insulation. Larger outsider air chambers keep you cradeled in the middle of the pad I-beam construction eliminates welded seams to reduce cold spots and ensures quick inflation/deflation, consistent air flow and stability Durable, lightweight 70D nylon diamond rip-stop top and bottom. Durable inflation valve. Internal polyurethane coating R-Value: 4.1. Rated to 35F Stuff sack and repair kit included. The repair kit is in a small pocket on the inside of the stuff sack. It's sort of hidden, so look twice!