Dura 8R

This would be my recommendation too. 75 denier interwoven with 170 denier. Definitely not an ultralight, but feels bullet proof, warm as anything, still super comfortable when dialed in. NOTE: if you have a sleeping bag with pad pocket or are using any sort of fitted cover, this pad is quite thick and large. Make sure your dimensions work.

The rule I've always heard is 1R for every 10 degrees below 70 as a \*minimum\* for survival, similar to how a sleeping bag rated at 0 means you'll be comfortable-ish around 10-20. Following this you'd be looking at a R5-6 at 15-50 so you're right on the edge of that. Applying the same 'comfort' rule you'd want a 6-8 depending on if you like sleeping cooler (6-7) or warmer (7-8) Exped Dura 8 (or DeepSleep \[R9\] if car camping) would be a strong contender for me in those temps. My philosophy is you can always vent heat if you're too hot in the cold, but if you're cold in the cold, you're cold.

The thing is built like a frikken tank, and I love it. Sure I could go lighter with the Ultra but I just love how strong the Dura line feels. I also have the DeepSleep for car camping and it's in the same vein. Very comfortable both, but I do love the added cushion in the foam mats.

I am the OPs size and the Expeds do very well. I have several, a shared Exped Megamat Duo, Solo Deep Sleep, and a Dura 8. All perform well and are very warm even in the cold. I've taken some down to 20°F (-6°C) and was fine.

R Value is cumulative so having 2 stacked pads will increase the total insulation. With that 2.2 + 4.x you'd be in the range you'd want to be for those temps. I use an Exped Dura 8 which is 3.5in thick (8.89cm) and works well for backpacking. When car camping I use a Deep Sleep (R9) that is 3in thick (7.62cm). Since both pads in question are about the same insulation value, I'd lean towards the thicker as long as it doesn't compromise your pack size or weight.

Exped Dura is solid as a rock and makes some very warm options at 5R and 8R. It is a bit heavier but also a much thicker denier of fabric. The Ultra series is a lighter version with thinner, more standard denier of material.

Exped is good, several models depending on what kind of camping. For reference I’m 6’ 330lbs. MegaMat/DeepSleep used for car camping. Dura used for backpacking. You may also be able to use furniture foam which would be cheaper and can be cut to different sizes.

Exped's Duras are super comfy, and they make an 8R one.

If you only camp in warm weather, opt for a 1r rated pad. I shelled out for the dura 8r because I winter camp. It is worth every single freaking cent. It’s more comfortable than my bed at home and it’s lasted for years.

Exped dura r8 is a religion for me

Just another plug for exped. It took me down to 6°F. I was actually scared to be out in it alone, but I was fine.

Exped Dura 8 is going to be the more durable / warmest pad combination out there for an air pad. If you want something cheaper that is warm you can look at the FlexTailGear pads. They have an ASTM pad over an R value of 6.

None really. I use a Nemo Tensor and have no issues. I also own an Exped Dura 8R that I've never had issues with and a Megamat for car camping.

Depends what you want to pay and what your use case is really. I have a cheap CCF mat from Decathlon for when it’s not too cold, which doubles as a frame to my backpack, A Thermarest NXT X-therm (not cheap) which is incredibly warm, packs down VERY small and is light, and an EXPED Dura 8 which isn’t light, doesn’t pack down small but is amazingly comfortable and gives me confidence that i can put it pretty much anywhere without damaging it. There’s always a trade off! Edit to add that my first Thermarest was sent back because it leaked!

Do you have a dog? Or plan on useing it often? Then forget about it. Exped is comfortable but not durable at all. If you use it multiple times a month it will not last 6 months. If you have a dog you would be lucky to have it last one trip. They are ok about warranty but after 3rd warranty claim It was not worth the hassel. Exped Is for the- "camps twice a year, weekend warrior, with no dog". IMO I was useing Exped Dura 8R