Pad Warmth

Hi Ross,
I add a GG 1/8" pad under my ridgerest in shoulder seasons. I 'subjectively' believe it adds some warmth. And I do use that little pad for sit pad, etc.
I'm not sure how it would work with the neoair since, if I understand the pad correctly, the insulation is based in large part on the reflective nature of the material?
Personally, I'm waiting on the neoair until I see some pattern in the reviews, yea or nay.

I was wondering about this too.
I have an exped 7 short r value 5.9. This is great in british winter conditions. Whether it is too insulating compared with my Rab 400 down sleeping bag plus clothing I dont know. We use the Rab 400 adapted as a double top bag with 2 exped 7s. By the way Exped 9 has an r value of 8!

I just ordered a neoair short r value supposedly 2.5. I have bought stock of evazote foam in 3mm, 6mm and 10mm thickness. I believe the evazote foam has an r value of about 0.15 per mm. So if I put 3mm ontop of the neoair I should get an r value of about 3. I would need about 20mm of foam ontop of the neoair to get to the r value of the exped 7. By then the combination would be much more bulky and heavier than the exped so of course a thin bit of foam is probably the limit

A couple months ago I had my Downmat 9 (R value of 8) around 0*F. On snow there's almost always a depression under your body, or the ridges of your foam pad… there was no sign of my having laid there when we packed up the tent. That said, my old Thermarest (about 3.8 R) combined with a Ridge Rest (~2.5 R) usually does have a bit of a divot after a cold night, and is noticeably less warm than my Downmat (though still reasonably warm). Based on nothing other than my personal experience, then, I'd say that for most purposes an R value past 8 would be a point of diminishing returns for ~0*F temps.

If I recall correctly, there have been some prior posts that when sleeping bags are rated the testing assumes an R-value of 5 underneath the bag. Please correct me if I'm wrong! (It might have been 4?) I also seem to recall that the Thinlight pads have an R value of 0.6something. Not much. But hey, it adds a little, gives you a cushy seat and some protection for the Neoair.