
Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

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Just did 37 miles and 3 nights with the neoloft. It was worth every ounce. As I get older I value sleep quality more than ever, and its just so comfortable. If you can fall asleep in something lighter like the nemo tensor or xlite do it. If not, its worth the weight.
A Katabatic quilt and the Rei Flash 55 would be next to pick up. You won’t need the switchback much, the Neoloft is plenty warm and durable.
I have the predecessor to the Megamat Ultra and it’s amazing, so I’d check out the Ultra. The other mat to consider is the Neoloft, which should be close in comfort but packs smaller. There will be a noticeable jump in comfort between either of these and ultralight pads like the Tensor All Season which I use for backpacking. My Exped is what I take on rafting/kayaking trips where weight doesn’t matter but volume still does. The foam pads like the regular Megamat are more comfortable but they pack down huge and will take up too much room in the raft, avoid foam if pack size matters. Those are car camping pads.
You mean backpacking? The Megamat ultra is my favorite comfort oriented pad that you can use backpacking but it’s pretty bulky, but for shorter distances or more base camp oriented backpacking trips it’s fine. The Thermarest Neoloft packs smaller while still being very comfortable so that’s a nice compromise. If you are pushing miles, the Rapide SL, Nemo Eclipse, Exped Ultra 6.5 are really good.
I’ll second the XR. It’s pretty comfy for stomach/side sleeping. But also, I tried out the NeoLoft at REI this weekend and holy crap is it a comfy cradle of air.
This is what I use!! Definitely worth the extra weight and little bit of time it takes to inflate. I sleep like I'm in my own bed
The Ultralight is certainly lighter, and a comfy pad compared to a lot on the market, but the Flex Air is on par with Thermarest Neoloft and Exped Megamat Ultra, except lighter and less balloon-like compared to the Neoloft.

Exped
MegaMat Series
Car camping comfort champ, but some side sleepers find it thin.

Exped
Ultra Series
Lightweight side-sleeper comfort, but a bit pricey and bulky.

NEMO
Tensor Series
Ultralight side-sleeper comfort, but slippery and prone to leaks.

Big Agnes
Rapide SL Insulated Sleeping Pad
Comfortable with side rails, but heavy and warmth claims disputed.

Therm-a-Rest
NeoLoft™ Sleeping Pad
Very comfortable, good service, but heavy and bulky for backpacking.

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Exped - MegaMat Series

Ranked #1
Therm-a-Rest - NeoAir Xtherm Series