Originally Posted By: Denis
Prior to getting the RidgeRest, I'd put an Emergency Blanket, shiny side up, underneath my mattress. In both cases, you get some of your heat reflecting back to you, the RideRest just boosts the overall R rating of your mattress system.

Actually, I just realized this is incorrect. Prior to getting the RidgeRest, I used the emergency blanket (shiny side up) on the bottom; a closed-cell, 1 cm thick, blue foam; then the inflatable mattress. The intent of the RidgeRest was to combine those bottom 2 layers into one piece of gear (the RidgeRest is thicker than the blue foam so it does provide a bit more insulation too).
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Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen