The Therm-a-rest ProLite offers adventurers the lightest and most compact self-inflating option on the market. The 1-inch (2.5 cm) sleeping mat uses diagonally-cut foam to increase warmth while saving weight, giving the ProLite a 2.4 R-value for three-season adventures. The high-performance WingLock valve allows the mattress to inflate three times faster thanks to a larger opening and one-way inflation. The set up is super easy, just get it out of the stuffsack and leave to inflate. You can top off with a few breaths for personalised firmness. The mat fits inside the most ultralight packs and is ideal for high-mileage, high-speed journeys where every gram counts. Stuff sack included.