This lightweight alternative to the RidgeRest Solar mattress is coated with a layer of our reflective ThermaCapture technology that redirects radiant heat back to your body to amplify warmth. Working in conjunction with the classic RidgeRest peaks and valleys, the SOLite mattress delivers exceptional insulation in an ultralight and virtually indestructible alternative for backcountry travelers. For maximum warmth, use reflective side-up.