Sea To Summit

Ether Light XT Insulated Air Sleeping Mat

Sea To Summit Ether Light XT Insulated Air Sleeping Mat

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Overall

#9 in

Sleeping Pads

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Sentiment score70% positive
28
5
7

Top Pros

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Last updated: Jun 10, 2026

Reddit Reviews

Reddit Iconpreciouscode96
4 months ago

Ah yes that was a common issue with the older ones. I have the newest one and fear it might have the same problem. Slept on it only one night but felt some cold spots where the most pressure was. Meanwhile it's R4.1 rated so should definitely be suitable for 3 season use. However my Nemo Astro Insulated feels warmer with mylar film in it

4 months ago

For almost your exact use cases I've got the Sea to Summit Ether light XR. It's quite expensive though, but will last you! It packs really small, isn't too heavy and incredibly comfortable. Much more than the one you found. If you think it's too expensive I'd highly recommend the Naturehike R5.8 pad. It's around $100 and heard someone slept on snow with it and seems pretty reliable too. Also not heavier than others on the market and packs small

4 months ago

You're welcome! Not sure why I was downvoted above haha. Yeah it was steep for me too, although found one for $160 so not too bad. It's very comfortable and as long as you don't go below freezing it should be good for you! Yes sure do! Not sure how reliable it is. But knowing Naturehike with their tents and other items they sell, you het excellent quality for the price :)

about 2 months ago

If you don't do winter camping I'd say get the Sea to Summit. I slept on it yesterday, it was the coldest night I've tried it at around 4 degrees Celsius and wasn't cold at all. Can take it down to just around freezing and have no issues, especially if you're a warm sleeper unlike me. Very comfortable pad, also good for side sleepers like myself. And very small to pack as well!

Reddit IconSacahari3l
12 months ago

There's no shame in it. Most ultralight sleeping pads are only considered 'comfortable' in the wildest of dreams. There are several midly comfortable pads which still can be called ultralight like Sea to Summit Ether Light XR, Zenbivy Ultralight Mattress, Big Agnes Rapide SL or Nemo Tensor. But once the comfort become priority you need to take a step up and take a look into Exped Megamat Ultra, Big Agnes Campmeister Deluxe, Thermarest NeoLoft and Zenbivy Flex Air Mattress.

Reddit IconShot-Rutabaga-72
6 months ago

Second s2s etherlite. I tried nemo tensor in store and I wasn't even comfortable there. I stopped waking up when I switched to etherlite. I think they have an updated version with a higher R score which I will get next year since I sleep cold and do a lot of shoulder season stuff.

2 months ago

I had the XT and it's by far the most comfortable one I ever had. But holy crap, I backpacked in the San Juans last fall and a few days dipped under freezing and I was really cold. My sleeping bag is rated 15 so it's likely not that. I also had a light foam pad underneath and it didn't help that much. Now I'm also stuck either getting the XR or the extreme version. I really like fall backpacking trips but I need one that's warm enough:(

about 2 months ago

S2s ether light is extremely comfortable. It is cold. I had a 15 degree bag, camped in the Chicago basin around Labor Day last year and I was cold (probably low around 25f? It definitely snowed). But I sleep really cold. It's by far the most comfortable sleeping pad I've ever had. Especially as a side sleeper.

Reddit Icontoprakatesagac
7 months ago

I am use 6' 3" and I use the Sea to Summit Ether Light XT Insulated, the large and rectangular one. It is 4 inches tick. Very comfortable. If it is not cold and if I am not seeking comfort, then I just use the nemo foam pad, but if I want comfort and warmth, I use the inflatable one. I find the whole deflating the pad and rolling/folding ritual cumbersome, but the damn thing is quite comfortable.

Reddit IconAccomplished-Way1575
8 months ago

Exped Dura. It has down. I have the 6R LW. You can get a slightly lighter version which is lighter due to thinner face fabrics. Avoid StS Etherlight XT at all costs, as I have had two getting pinctures where the dividers attach. Constant flats from just lying on them. And I am not the only one. This is why I bought the Exped Dura.

Reddit Iconlenn_eavy
9 months ago

My wife has S2S mattress - the one you are looking at or slightly colder and she likes to sleep warm. We were doing Tour du Mt Blanc this year and you want all the comfort you can get for multiple days of 1000 m up and downs even if it is worth few grams more. Nemo seems to be thicker though? And you don't have to inflate it all the way, so it will make more room for your hips but watch out, too close to the ground and it'll get cold in the middle of the night. We both use Cumulus 250 quilts and I have Thermarest NeoAir Xlite (R 4.5) - I was sweating some nights so if anything, Nemo will be too warm for the proper Summer and maybe shoulder months.

Reddit Iconmatchabeans
2 months ago

I'm a side and belly sleeper and the Sea to Summit Etherlight XR Pro is going to be the only pad I plan to own at long as it doesn't pop. I had the Etherlight XT before it got updated and it was MAD comfortable, but it slept too cold. It is thick and the dimples make the pad feel like a mattress. I haven't bothered trying other brands because the Ether Lights have just been comfortable from the start. Just my 2 cents.

3 months ago

My only UL pad is a S2S Ether Light XT, R3.2. I love how comfortable it is and I sleep the same way as you. The only issue I have with it is the low R-Value, so I was cold camping the last few months. I wish I bought the Extreme XR pad instead because I could use it for all seasons, but now I am stuck having to buy another warmer pad. Not sure if I should just get the cheaper NatureHike pad (I have one of their tents and love it) because I don't camp a ton in the winter. But I would hope that I camp more often in general as the seasons go by. Cheers

4 months ago

I didn't realize this pad has been out of stock since last year and I am kind of bummed! There are too many sleeping pads to pick from on the market these days and I was wondering if anyone had a good alternative to the Sea to Summit Ether Light XR Pro. I have the Sea to Summit Ether Light XT and I find it to be very comfortable, it's just too cold for me to use with an R Value of 3.2. I have pushed it down to the 20s and I would barely make it through the night. I have been looking at the Nemo Tensor All Season UL pad with an R Value of 5.4, the Nemo Eclipse All Season (R6.2), and also the new Exped Ultra 6.5R Sleeping Pad, but I am unsure which direction to go. I don't plan on sleeping on snow but it could very well be a possibility in the future. I want this pad to last a long time because they're so expensive. Ideally I'd want to spend less than $300, would prefer the regular wide versions of the pads, as lightweight as possible, and 3.5-4 in in thickness. Thanks in advance EDIT: Hey y'all as an update, because I don't want to spend $100+ on another pad, I decided to just buy a Nemo Switchback using my REI rewards. I figure it'll boost my current pad by R-Value by 2 making my sleep system more like r-5.2. more bulk but at least I can wait for the sale in May when pads become much cheaper (hopefully).

4 months ago

Well this is really helpful... Thank you for your detailed review! I'll look into seriously considering the Exped. I've only really heard good things I'm just unsure about the baffling on it being uncomfortable.

3 months ago

I am in the U.S.! My REI kept showing out of stock but I see it's available now? But I just made an update/edit to my post and I got a Nemo Switchback for now to try to boost the R-Value of my Ether Light XT. After thinking about it more, I'd rather get a pad I know is comfortable--not sure if REI has Tensors blown up but I might try next time I'm there. I'll keep a lookout in May when they have their biggest sale to see if I can get a discount on the Pro, because it's r-value feels more long-lasting. Thank you!

4 months ago

Definitely not in a rush... I was actually planning to pick one up when the sale is going on next month! I have some dividend money to use towards it too. It just stinks because I really find the Sea to Summit pad so comfortable and didn't realize the warmer pad has been out of stock for some time. So I'm worried a different brand won't be as comfortable. I'm leaning most towards the Tensor because it has a similar baffling to my current pad. Thanks for the reminder!!

Reddit IconMotorBet234
6 months ago

I use a Sea to Summit EtherLight XT, which they claim is 4" thick and with a 4.1 R value, but even the size L is only 25" wide. I'm a side sleeper, so I appreciate the extra thickness and am less worried about the width. It looks like the Big Agnes Zoom UL comes in roughly the same width. You could go crazy and buy a double-wide mat from any of the major brands, with widths from 40-50", but it seems a lot of those pack as large as 11x6".

10 months ago

I recently swapped to the Sea to Summit Ether Light XT Insulated and can definitely recommend it. I’m a side sleeper and the extra thickness is welcome but it’s not much bulkier packed than my previous pad.

10 months ago

Thanks - I’m fairly certain that’s the one I’ve got.

11 months ago

Sea to Summit EtherLight XT Insulated. I also have a NEMO Tensor Ultralight but find it too thin for side-sleeping.

5 months ago

Can't speak from a racing context, but I've got 2 different inflatable sleeping mats that I'd vouch for. NEMO Tensor Trail Ultralight to save weight and bag space, but I do find it thin for side-sleeping and I'd expect it to be under-insulated for colder conditions. Sea to Summit Ether Light XT Insulated packs larger and heavier, but it's now my year-round option due to the additional comfort and R value. It'll still take up less space than your foam pad. I carry a little Flextail camp inflator for blowing up my pad - inflates in like 30 seconds, I'll also use it to deflate just to get all of the air out, avoids humid breath causing mold inside the pad. I'm tent-camping, and the inflator doubles as an LED lantern inside my tent, which is especially handy as I'll often wake before the sun.

2 months ago

I'm also a side-sleeper, have been using a Sea to Summit EtherLight XR Insulated. Very comfortable.

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