Gr33ncarIt has an r-value of 4.4. Here's a chart from the Thermarest site. Depending on what kind of conditions you intend on camping in, this pad should be adequate in combination with an appropriately rated sleeping bag.
You might also want to read up on cold weather hammock camping, if that's your intention. I'm under the impression that a sleep pads r-value may be effected by being completely surrounded by cold air, as you are in a hammock.
Hope you find this helpful.