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

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Was it the wide version of the Xlite? I have an old, since-discontinued Xlite Max SV which is similar to the Xlite XNT Regular Wide - it seems to be both thicker and wider than the Xlite of old. Normal mummy sleeping pads are no good for me but wide ones are much much better for things like arms going numb!
I'd recommend a thermarest xtherm and a 0 degree quilt for what you are looking for. A sleeping pad with a very high R value like the xtherm means you can get away with a little less sleeping bag/quilt and still be very comfortable all while being quite light amd packable You'll also have some decent insurance if you get an unusually cold night if you sleep in am extra layer. You could alternativley do a thermarest neoair on top of a accordian style mat for a similar R value and extra insurance if the air mattress fails For quilts you cant go wrong with enlightened equipmemt. I have a 900 fill goose down 0 degree quilt and it is extremely packable Do yourself a favour if you go down the thermarest air mattress get the wide 25inch version of each the small bit of extra weight is so worth it compared to the difference in comfort the extra wodth makes
I love my Thermarest neo topo air xl, but have recently picked up a KilosGear Aerocloud elite and it might be my new backpacking mat. More comfortable for side sleeping than even my thermarest.
So I've always just used by Thermarest NeoAir XLite Regular Wide. It's hard to beat the width, 1lb weight, and comfort. BUT, just recently backpacked with a buddy that supplemented that with a rectangular little short foamie, that he strapped to the outside of his pack. For that extra 10oz, you get cut protection, a sitting pad for when you're having dinner, a laying pad for reading a kindle on a rest day, AND another 2 or so to your R rating. I'm doing this from now on, well worth the $60 and 10oz. edit: I just bought the Therm-a-Rest Z Lite SOL "Regular" for $39 on sale at Dicks Sporting Goods. Free shipping. I'll just cut a few of the rectangles off until it's 10oz and a little shorter. It's $10 cheaper there than the short version anywhere else on the internets...
A NeoAir Xlite is fine at 20F. Cut to 3/4 length, it comes to 9.6 oz and packs pretty small.
They can be cut down to torso length, but from personal experience, let me warn you about that. Torso length doesn’t work great for thick pads like an XLite unless you can find some support for under the knees. Your legs will hyper-extend due to gravity, which is uncomfortable and not physiologically healthy. Adequate head elevation is difficult if not impossible with a torso cut inflatable . I cut mine to 3/4 length such that the knees and head can rest on the pad. That works much better. My cut-down Xlite weighs 9.6 oz. Torso-length CCF pads are actually more comfortable than a torso-length inflatable for the reasons given. They also solve the problem of arms falling off narrow pad and are also lighter and much more durable.
Have you looked at a Thermarest Xlite? Better warmth to weight than those options.
If you wanna make it even more lighter and packable, there’s a way to [shorten it](https://m.youtube.com/watch?v=90Fx6TLNEJQ) down to three-quarter length and use your backpack for the lower body insulation. That’s what I do. Mine weighs 270 g after the modification.
That’s old news. They’ve altered the way they make them so they are nowhere near as noisy anymore. They used to sound like crinkly paper when you turn. No longer.
Therm-a-Rest NeoAir XLite with an r-value of 4.5 weighs 370g. You don’t need a stuff sack.
Is there much difference? Both seem about 500g plus change unless I missed something. I’d second getting the right length, I tried a shorter mat years ago and my feet were very unhappy about it

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