The Z Lite mattresses are Therm-a-Rest's lightest, most compact closed-cell mattresses. The Z Lite SOL features a compact accordion-style shape and heat-trapping dimples and also adds the 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 durability. Wherever you’re headed, a Z Lite mattress is the right choice for ultralight warmth, durability and comfort.