Original Z LiteStill a favorite of the ultralight elite, the Z Lite mattresses are our lightest, most compact closed cell mattresses. Both the Z Lite SOL and the original Z Lite feature a compact accordion style shape and heat trapping dimples. The Z Lite SOL adds our reflective ThermaCapture coating that helps capture radiant heat, increasing overall warmth by nearly 20%. The proprietary foams are softer on top for extra comfort and denser on the bottom for extra