I've been up the mountains testing tents and mats, and out of contact.
Let me emphasise: all the figures quoted for mats are SI units. I don't know right now what the R-value is for aerogel, and will need to look it up. Right now I am my daughter's place for dinner on the way home, and not really in 'back on earth' yet.
It was meant to be an Autumn light-weight walking trip with light joggers .... We got ~8" snow on the last night and getting off the mountains via a long backcountry dirt track was 'interesting'. We had the chains on the 4WD for a LONG time. Not quite what the weatherman forecast, but that is totally typical for around here.
Tents and mats survived the experience, so all was well.