Dura 8R
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Any Exped Med-Wide pads fit the bill. Incredibly comfy to boot. They are more expensive but a good nights sleep it worth it imo. Best investment I made for camping. I got my Deep Sleep for just over $100 on sale.
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.
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
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.
I'll add another vote for Exped. I've got a Megamat Duo I take for car camping or no portage canoe trips with my wife. Exped 8R for hike-in winter camping too. I also recently got the single size Hikenture 4" foam + air mattress and it seems to be quite similar in terms of comfort but for only $100. For backpacking or longer portage trips where weight is a concern, I also really like my Thermarest NeoLoft pad.
Exped is amazing. I was lucky enough to get my 8r pad half off. They pack down decently small too. They arent tiny but for how comfortable and warm mine is im surprised by it.
I have had so many damn air mattresses leak. I was about to be done with them. Then I got an exped 8r pad for half off and it is amazing. No leaks and I've been camping monthly with it for almost 2 years. Most of my cheap Amazon mattresses and even a $100 one lasted 3 or 4 trips most.
After buying and using nearly everything on the market, all of my sleeping pads are now Exped. They are just excellently made and they've never failed me in sub zero temperatures. They come with a shnozzel bag to inflate them up so you don't have to blow into them and introduce moisture which lowers their effectiveness. [Exped Dura 8R](https://www.expedusa.com/products/dura-8r)
I couldn’t get comfortable on mine. Couldn’t avoid waking up with lower back pain. I switched to an Exped Dura8 LW. Noticeably bigger and heavier in the pack but it’s worth the comfort.
I recently switched from the Thermarest XTherm NXT as I just couldn’t get comfortable on it. I loved the weight and small size of it when packed down and I really wanted to like it. I tried different levels of inflation, pillow under my knees etc, but in the end I just couldn’t avoid waking up with significant lower back pain. I went for the Exped Dura 8R MW which is HUGE when in my pack but god damn that thing is comfortable. I don’t have any concerns about its longevity either. It’s robust AF. It’s the cost, quality, weight triangle I guess.
My relative has this. She bought it for her and her bf and she loves it. I have the Exped Dura 8R for winter camping and told her to check the brand out and she sprang for this model. When I’m not solo camping on the ice I have a pair of similar pads by Thermarest called the Mondo King XL. They also pair great together for a couple. If you check the specs they are very similar, so I’d gauge packability, desired footprint dimensions, solo vs partner etc. You really can’t go wrong I love both Exped and Therma
I've had four Expeds. Still have two. Both have the built-in pump. One has synthetic fill. The other has some down insulation which makes it good for ~10F colder than without. The first two developed tiny leaks (could not find them even with submerging). They were a few years out of warranty. Exped still replaced both. I appreciate a company that stands behind their products. I also like side-sleeping. I have not used these as much as what you will. So durability...🤷