Ultra 3R

I use the small rectangular version of the 3r. Plenty warm enough down to freezing. It feels warmer than only 3 of r vallue. I can sleep on my side just fine with the rectangular version and I chose the small one since it’s long enough for me at 175cm since I ralrely sleep with my legs straight.  If I don’t inflate it to the max it’s quite comfortable and I’ve had the same issues that you describe with many other brands including thermarest and Nemo.  Edit :  I was able to get it cheaper than the xlite where I live. I’m in eu.  Also the pump sack is awesome and doubles as a good pack liner when I store my clothes and sleeping bag. 

After trying pretty much everything, I tried the thermarest prolite XS for fun. For some very strange reasons I sleep very well on such a minimalist pad. And that’s the thinner discontinued version not the prolite plus. I only sleep on my side. Other pad that I really like is an exped 3r size S. The rectangular one. 

Personally id avoid thermarest cause they are so loud. They also come in weighing over spec often, so they warmth/weight advantage is a bit smaller than it seems. If you are considering other options. I think that the vertical baffles are way more comfortable. Exped, big agnes do these. A good deal on an exped mat in the UK https://www.expeduk.com/products/ultra-3r?variant=44171519230266&country=GB¤cy=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=20269517648&gbraid=0AAAAApwKUJuFrFp2UHLTjT1Yw3J7Jtb3K&gclid=CjwKCAjw3f_BBhAPEiwAaA3K5PDLOMRlNwjFmZzPRNER1N8ldFP9UYieepFeWgIYz7oR24VeuniABRoCUAkQAvD_BwE

Exped Ultra is comfortable and ultralight. Pretty affordable, too. Give it a try. 

I’d get the 3R and supplement with a CCF pad for the occasional sub freezing trips. That’s my personal setup.

As far as $/warmth ratio, this one is the winner. $50+ cheaper than S2S, Therma, Nemo and really comfy. I love mine.

The 3R is a pretty incredibly value for an 18oz pad at around $150. The 5R is probably better for being in Maine outside of summer.

I got an Exped Ultra 3R for like $60 on r/ULgeartrade. Try this sub and FB Marketplace/Craigslist.

This is what I use and love it.

6'1, 260 lb side sleeper.... Exped Ultra 3R is my pad of choice for my climate, but they have some with much higher R-values. It's more comfortable, to me, than either the Nemo Tensor or Thermarest X-Lite.

I was that way until I found the right sleeping pad and pillow situation. I'm using an Exped Ultra 3R and an Exped mega pillow. It's amazing.

I only have experiences with the Exped Ultra 3R. I used it for a 60 day tour in Scandinavia and it worked great, slept almost better than at home.

This is the pad that finally let me sleep

I second this take on the Exped Ultra 3R. It's my main pad, and while I've taken it down to 25° F ≈ -4° C, I'd rather have a warmer pad when the temperature drops below 30° F ≈ -1° C.