SynMat HL Winter

I don't know the weight of the Exped you listed, but you are right about the website weights of the vendors. I do have an older R=5.2 Exped SynMat Winter HL in medium wide that weighs 539 g. Here is a photo of it rolled up: [https://imgur.com/a/SZs4DAy](https://imgur.com/a/SZs4DAy) And a photo of it in a tent with another pad: [https://imgur.com/a/F4cSV7j](https://imgur.com/a/F4cSV7j) I recommend a WIDE mummy pad. Your listed sizes suggest that those pads are not wide and other numbers seem off to me, too. Probably you might need to see the m in person.

My Exped LW9 is a dream

What country are you in? It may have a different name. I'm in Australia. There are two. Exped downmat XP 9 LW Exped synmat 9 LW I have the synmat. If l was backpacking l would have got the down one. I have no idea what XP means, but LW is long wide. Good luck

I use an xped 9cm thick. Absolutely a winner.

I have a previous back injury. I find the Womens S2S Etherlight to be the most comfortable, though the least warm. Next for comfort is the Nemo All Season, as well as the Nemo Tensor. In comfort, they are both just slightly less comfortable than the S2S. Both are warmer than the S2S. I have used the ExPed Hyperlight pad for about 40 nights. I believe this pad has been replaced with the newer version. Mine was a 2.8R value. For me, the warmth was equal to the S2S pad. It was not an uncomfortable pad. It just wasn't as comfortable as the S2S and Nemo pads. I tried the Thermarest NeoAir Xlite. My lower back ached when I used the pad. It just didn't have the support I needed. I wish I could use it as it has great warmth to weight ratios. I used the wide versio pads for each of these, though the Exped was a mummy MW version I would assume what is comfortable for me may not translate to you as your back injury may be different than mine. My injury involved the lower back. I have slept in a hammock a few nights and never experienced back pain.

If you get a Big Agnes it will squeak against the tent floor all night when you move. I use Exped. Not completely noiseless, but built differently than the Neo pads and not a Big Agnes. I have a discontinued Hyperlite, will replace it with an Ultra when it develops too many leaks just as I did the Synmat. I wish they still made the Hyperlite.

I have an Exped Synmat and it's quite comfortable. It's more "air mattress" than my Thermarest Prolite Plus but more comfortable. So much so I'm insisting my wife use my Synmat mattress instead of her existing Thermarest on our next trip. I can handle the lesser one (I hope). I think basically if you're spending some money it's always going to be more complicated than "air mattress". I think OP means a classic vinyl sack filled with air. They tend to have poor support, zero vapor management, and are cold (because air convection inside the mattress takes all your heat and moves it to the ground).