When we're looking to cut weight without sacrificing comfort, we slide the Therm-a-Rest NeoAir XLite NST MAX Sleeping Pad into our bag and hit the trail. The rectangular shape gives us plenty of room to spread out, and the improved internal construction significantly reduces noise as we move in our sleep, ensuring we rest easy under starry skies. The 4. 5 R-value is well-suited for camping trips in chilly weather, combining the Triangular Core Matrix and ThermaCapture technology to efficiently keep warmth beneath us no matter where we set up camp.