Klymit has the R-value at a 5. REI says 4.4.
Sleeping Pad R-Values of 2024 - SectionHiker.com
A backpacking or camping sleeping pad's R-value measures its resistance to heat loss to the ground w
sectionhiker.com
The actual TESTED values on all the Klymit pads are nowhere close to the advertised values. I have the 30" wide Klymit and love that pad in warm weather, but froze my butt off on a Montana hunt on it. Go through that table and look at Klymits R values against everyone else's. Thermarest pads had a lot that actually tested better than they claimed. Klymit pads all dropped to less than half the claimed values.