The thermarest website lists all 3 sizes...
The thermarest website lists all 3 sizes as having an R-value of 4. I think backcountry has made an error with the R-value for the Reg. size.
Yep...Sand them email (:
Hey Salonick Nalod,
Thanks for catching that. We'll have that fixed to the correct R-Value of 4.0 shortly.