Therm-a-Rest Z-Lite SOL Sleeping PadThe classic ultralight and dependable sleeping pad. Always a favourite of the ultralight elite, the Z Lite SOL expands upon the ultralight performance of the Original Z Lite by adding our reflective ThermaCapture coating to capture radiant heat and increase overall warmth by nearly 15%. Factoring in the system of heat trapping dimples, the Z Lite SOL has an R Value of 2. 0, making it perfect for use on its own in warmer weather or layering under