I know that I will be cold using it alone if the air temperature is below 35F.
That is one of the problems when comparing opinions on R requirements for mats.
The R value required is related to ground not air temperature so the same person at 35F could be warm one night but cold the next using the same mat (all other things being equal)


You guys are way too sharp!
And that is why they puncture their mats...
Franco