Equally at home backpacking through the fall or car camping in the spring, the Therm-a-Rest ProLite Plus Ultralight Self-Inflating Backpacking Pad gives added warmth and comfort without sacrificing packability. The thick diagonal-cut foam offers a lightweight pad with a 3.2 R-value for comfort and warmth during three-season adventures (R-value measures the material’s ability to insulate; the higher the R-value, the warmer the sleeping pad). The 1.5-inch thick mattress expands on its own and tops off with a few breaths thanks to the self-inflating design. Available in two styles: Equipped with the Standard Valve, or equipped with the WingLock Valve which is able to inflate a pad three times faster than a standard valve thanks to a larger barrel and optional one-way inflation. Both styles of the ProLite Plus includes a stuff sack to protect the pad when it's packed down. Made in the USA. Manufacturer’s limited lifetime warranty.