SynMat UL 7

Hah yeah- I still use a 10y/o Exped Symnat UL. Vertical baffles, r value around 3. 13.5oz with the repair kit. With just one exped official repair, its lasted around 3000 miles. I keep considering changing it and have never found something to justify a change.

I carry this type of pad for added cushion and as a backup for a possible failure of my main Exped Synmat 7. I would not use something like this alone because I would feel the hard ground and not sleep. Add the few pounds and get an inflatable and sleep like a baby.

Side sleeper here and the Exped vertical baffles are great.

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).

G'Day Practical, I've had an Exped Synmat which I recently replaced with an Exped 5R (I haven't used this yet, but it is the successor the Synmat). The Synmat lasted quite a few years and I was very happy with it. Both mats are rectangular rather than tapered so I think you will be less likely to slide off it. I certainly never had any problems, which is why I bought the 5R. Regarding sleeping bags, I have a three season bag (Exped Ultralite 300, \~300 g down) which I can pair with an inner bag (Macpac Snowflake, 130 g down). I used this combination (along with a silk inner sheet) in Nepal up to 4000 m (in accommodation) and was always comfortable. Note, you didn't mention having an inner sheet. If you do not have one, I advise you to get one (silk, not cotton). I think it is worth buying quality products from reputable manufacturers. They will last you a long time and be reliable.

What time of year are you going? I've done a lot of camping in Iceland in a range of seasons over the course of about 7 trips, if you're going in summer you don't need anything particularly large, just think UK spring or Autumn really. I took a Synmat in May/June and it was fine. All I would say is that it's very windy and there are very few trees or vegetation so your tent needs to be able to stand up to the wind exceptionally well. I stayed at a campsite on the south cost where someone's tent literally blew away with about half their stuff in. It ended up in the sea. So get good pegs. The ground isn't very soily! Definitely take a ground sheet protector there's some spikey rocks.

I was using a backpacking style exped inflatable pad and recently replaced it with a self inflating one. Takes up a lot more space but far more comfortable (and quiet!).