In the world of lightweight backpacking, the less an item weighs, the fewer features it's supposed to have. Not true with the Therm-a-Rest All Season All-Season Sleeping Pad. The patent-pending Triangular Core Matrix technology boasts over 100 cells and reflective barriers to trap warm air without the bulk of regular insulation, so you can enjoy unprecedented comfort on the trail in any season. The 2. 5in thickness and an R-value of 4. 9 make for excellent insulation when sleeping on the cold ground, while the included stuff sack makes packing and transport a breeze.