The Z Lite mattresses are the lightest and most compact closed-cell mattresses from Therm-a-Rest and have become the favorite mattresses of all outdoor enthusiasts who want to travel with minimal luggage. Both the Z Lite Sol and the original Z Lite feature a compact accordion-style shape and heat-retaining ridges. Additionally, the Z Lite Sol has a reflective ThermaCapture coating that retains radiant heat, increasing overall temperature by about 20%. Therm-a-Rest's proprietary foams are softer on top for added comfort and denser on the bottom for extra durability. Wherever you are, a Z Lite mattress is the right choice for ultralight warmth, durability, and comfort.