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Which side of a closed cell foam pad goes down?

As I type this, I know it's a very newbie question but I've seen it done both ways (silver side up and silver side down) and haven't been able to find any kind of authoritative answer anywhere.  I have one of the Therm-a-Rest Z-Lite Sol Sleeping Pad closed cell foam pads that intake with me to sit on, rat on, unpack on, keep under my hammock and whatever else I can think of.  It's blue on one side and silver on the other. I usually use it silver side down but have seen others using theirs both ways.  Is there a "right" way? 

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@hikemore also according to Thermarest the silver coating makes a 0.3 difference in R rating.  The current "original" Z-lite has an R rating of 1.7 and the Sol with the coating,  2.0.  As far as I can tell, the coating is the only difference.

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