The Sea to Summit Pursuit Self-Inflating Sleeping Mat is the lightest self-inflating mat in its class, offering three-season comfort for camping and backpacking. Designed with five-centimeter horizontal Delta Cores, it creates air-filled chambers that reduce weight and bulk while maintaining stability and insulation. The thermally efficient Contour shape supports side sleeping and natural movement, while the rectangular options provide traditional comfort with added width. Each mat features bluesign APPROVED, RCS-recycled, non-PFAS, solution-dyed fabric for durability and sustainable performance. The XPEL multi-function valve allows fast inflation, deflation, and adjustment, and the included side-loading stuff sack makes packing quick and easy. Available in four sizes: Tapered Regular measures 72 x 22 x 2 inches and weighs 1.33 pounds, Rectangular Regular measures 72 x 25.2 x 2 inches and weighs 1.71 pounds, Tapered Large measures 78 x 25.2 x 2 inches and weighs 1.61 pounds, and Rectangular Large Wide measures 78 x 29.9 x 2 inches and weighs 2.31 pounds. The Sea to Summit Pursuit SI Sleeping Mat is ASTM-tested with an R-Value of 4.1 for reliable insulation in varied conditions. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.