Sea to Summit Ether Light XT Insulated Sleeping Mat - Large

ASTM R-Value: 3.2 / Dimensions: 198 x 64 x 10cm / Packed Size: 12 x 28cm
Weighs 624g (excluding bag)
Code: SS20617
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The Ether Light XT insulated mat provides exceptional comfort and warmth in a very light package.

 Sea to Summit says:

Our lightest and thickest full size Air Sprung Cell™ Mat with insulation for all-season comfort.

Refining lightweight cold-climate sleeping comfort, this mat combines a lightweight 30/40D Nylon fabric, Exkin Platinum® and THERMOLITE® insualtion with a loop baffle Air Sprung Cell™ construction to create a 10cm thick mat with an incredibly low weight. Larger air pockets are created by using many looped TPU baffles which connect the top and bottom fabric layers with our Air Sprung Cell™ dot weld pattern. The looped baffles allow the top and bottom layers to be positioned further apart creating larger pockets of air when inflated that require less fabric overall. Perfect for side sleepers, the extra height of this mat lets hips sink deeper into it without touching the ground.

The Sea to Summit's Ether Light XT Insulated Sleeping Mat impresses straight out of the box. It was straightforward to inflate with the the well thought out integrated stuff and pump sack. I found it surprisingly easy to roll up and fit into the stuff sack something I cannot say of some other inflatable mats.

The depth of the mat sets it apart from its competitors providing extra comfort and keeping you further away from the cold ground whichever way you sleep. The outer fabric is tough and grippy so the mat will stay where you want it.

- Reviewed by Ultralight Outdoor Gear

Read reviews here:

Help and advice:
  • eXtra Thick (XT) loop baffle Air Sprung Cells™ 
  • Lightweight, quiet and grippy 30/40D Nylon fabric,  field repairable with included self-adhesive patches
  • Exkin Platinum® and THERMOLITE® for insulation
  • Air Sprung Cells™ for a more comfortable sleep
  • Ultra-Fresh® anti-microbial treatment to the TPU formula to  prevent internal mould growth
  • Pillow Lock™ attaches an Aeros™ pillow to mat
  • Multi-functional, high flow-rate valve
  • Weighs: 624g (excludes bag/pumpsack)
  • Airstream pumpsack/storage bag weighs: 56g
  • Dimensions: 198 x 64 x 10cm
  • Packed Size: 12 x 28cm
  • ASTM R-Value: 3.2

ASTM R-Value:

From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.

You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.

In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.

Showing our 1 review for Sea to Summit Ether Light XT Insulated Sleeping Mat - Large. Write a review ›
Review Summary - 5 out of 5 based on 1 rating.
October 20, 2020 | Kevin Klein
Best sleeping mat on the market right now hands down

Apart from the unparalleled 4 inches of thickness, the insulation and sprung cell technology provide excellent comfort. The 2-in-1 valve make inflation and deflation super easy. And despite it's thickness and insulation, the S2S Ether Light XT packs down to the size of a 1 litre bottle, at only 600g of weight - quite impressive. The bag also unfolds into a pump sack, however I'd recommend using a small electric pump for convenience. As it goes with all mats however, you'd most likely want to get a size large as a regular sized guy - as when you go with size regular, there's virtually no arm space. And trust me, you'll be wanting a wider mat, even if you're not a side sleeper - you'll be slipping around at night, since it's hard to find a space in the wilderness that's relatively even. So large still means regular, and regular still means small when it comes to sleeping mats. I'm 5"8 myself and was lucky enough to find some decent reviews prior to my purchase however, I'd wish the manufacturers would listen to their customers a bit more in regard to these things...

Ultralight Outdoor Gear Limited