As the lightest and most compact self-inflating sleeping pad available, the Therm-a-Rest ProLite Women's Ultralight Self-Inflating Backpacking Pad with WingLock Valve provides essential comfort for backpacking and camping adventures. With a 2.7 R-value, the ProLite has enough insulation to be the perfect companion for three-season adventures (R-value measures the material's ability to insulate; the higher the R-value, the warmer the sleeping pad). The self-inflating foam uses diagonal-cut channels, reducing weight and packed size while still retaining heat. The 1-inch thick pad will expand on its own with an open valve; top it off with a few breaths. Equipped with a dependable and rugged WingLock valve, the pad inflates three times faster than a classic valve and features lightning-fast deflation with a larger barrel and optional one-way inflation. The ProLite includes a stuff sack to protect the pad when packed. Women's Regular measures 66x20x1 inflated, packs to 11x5.8 inches, and weighs 18 ounces. Manufacturer's limited lifetime warranty.