Interestingly, I just did some quick Google research and found the info below indicating that land surface temperature (LST) can be 5-10°F COLDER than the air temperature.
But I can’t find any research specifically comparing sleeping pads on ground vs. air. My experience and testing agrees with BillyBob’s in that wind has never been a factor for my under-insulation when using a pad.
I used to under-inflate my pad for stability like chapinb, but on a backpack trip once, I was too cold on an unexpected freak-cold night. The next night was just as cold, but I fully inflated the pad and I was much warmer. I’ve fully inflated my pad ever since, and find it quite comfortable.
I recently discovered the Treem Hammock method of teathering a set of secondary dog bones low on the trees which completely solves the stability issue.
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