SynMat HL Winter

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’ve been using a similar set up for years now. Robens z mat, Exped Synmat and a Criterion sleeping bag. Haven’t had an uncomfortably cold night yet and I tend to camp in autumn and winter.

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.

Exped mats are the least crinkly on the market. And the have big side baffles to cradle you. I like the Exped 5R Synmat.

That bag will not hold up, it’s a rectangular and won’t seal well and temps are below what it’s rated for. Even with layers and extra blankets it’ll be an uncomfortable at best night. The pads are also borderline and I’d recommend a couple more Rs to get to a better insulation value. You can either upgrade one of the pads (maybe a 5R Exped) or add another pad to your setup. I don’t like stacking too many pads as they tend to slide and you lose insulation. Tie wrapping them together can help.

Exped is good, several models depending on what kind of camping. For reference I’m 6’ 330lbs. MegaMat/DeepSleep used for car camping. Dura used for backpacking. You may also be able to use furniture foam which would be cheaper and can be cut to different sizes.