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.