Eddie Valiant: "That lame-brain freeway idea could only be cooked up by a toon."
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No worries. I just hadn't had a chance to go back for the edit in time.
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Recently I've been using a TR Xtherm Max long/wide cut down and resealed to make it a med/wide (71"x 25").
I've got a grand total of 4 nights on it using it at 4, 22, 25 and 30°F, all nights sleeping on snow. While it is definitely noticeably warmer than the Trekker alone and maybe a smidge warmer than the Trekker + 3/8" CCF pad, I still needed to put my long-ish Evazote sit pad between me and the Xtherm because it was a still a bit cold in the shoulder-to-hip region. However this worked perfectly and I was comfortable.
I'm guessing that snow is perhaps the most difficult surface to insulate against because it is a practically bottomless heat sink that isn't much influenced by ambient temps.
I have a Nemo Tensor which I like quite a bit. It's light, extremely compact, and doesnt crinkle.
You lose about .27 oz. per inch of length, a bit less for the curved part. Do the math for how short you want it, determine the length desired when inflated. I got my All-season a bit shorter than I was shooting for. Set the iron all the way hot, trim out the stuff in the middle, melt a new seam. Curve the corners to keep them flat, I used a yardstick clamped to my ironing board to get a nice straight line. No warranty, but I have not needed it. X-lites are about .2 ozs per inch. Be brave, customize!
Forget my xtherm...a buddy just bought this....I have pad envy!!!
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Mine is the Xtherm Max which is the rectangle shape, not the mummy, and after cutting it down it weighs 20.6 oz. I did not weigh it beforehand. REI spec is 23 oz stock, so that's pretty much in line with Sandy of PA's projection. IIRC it was something like 80" long inflated, which was much longer than I needed (5''9")!
Unfortunately CD/TR doesn't make anything in the M/W format and only one air mat, the Trekker, in the S/W format, so if you want those you've gotta get a Large and cut it down. I've cut-and-resealed a couple before and it is not that hard to do. For sure, a bit of pucker factor when slicing into a brand new $200+ air mat, lol. Practice with the iron a little bit on the piece you cut off to gain some confidence. I've never had any problems at all in the field with the ones I have shortened.
BA Q-Core SLX is luxurious, stable, warm and packs small. I prefer the 25" wide as a side, rotisserie, quilt sleeper.
https://www.bigagnes.com/Products/Detail/Pad/qcoreslx
For weight and price:
https://www.bigagnes.com/Products/Specs/Pad
An Amazon seller has a great deal on the Exped Synmat UL7 MW. If I did not already have one.... https://www.amazon.com/Exped-SynMat-...MSE?th=1&psc=1