Sea to Summit Ether Light XT Extreme Insulated Air Sleeping Mat-Regular

The new Sea to Summit Ether Light XT EXTREME Insulated Air Sleeping Mat has a R-value of 6.2 and is 10 cm thick making it extra comfortable an made for winter adventures. This regular size air mat with insulation weights only 720 g (for a standard size 183 cm) and uses two types of insulation - dual-density layers of Thermolite and Exkin Platinum to provide the needed protection in extreme conditions and benefits from STS's Air Sprung Cell design to become an extremely comfortable sleeping mattress that you can take on any adventure, anytime.

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With an R-value over 6, the 10cm thick Sea to Summit Ether Light XT Extreme Insulated Air Mat redefines lightweight sleeping comfort for winter adventures around the globe.


Sea to Summit’s Air Sprung Cells are the reason you will sleep better on this air mat. Each Air Sprung Cell deforms independently and allows the mat to conform to your body shape. This provides support and comfort by more evenly dispersing pressure across the mat’s surface. For the extra thick (XT) Ether Light design, many TPU loops are used to connect the top and bottom fabric layers to the Air Sprung Cell dot weld pattern. These loops allow the top and bottom layers to be positioned further apart which creates larger pockets of air when inflated—perfect for side sleepers. This design also requires less fabric overall which means great stability and comfort for less weight.


Dual-density layers of THERMOLITE insulation fill the Air Sprung Cells and work together to prevent convective heat transfer and boost warmth while remaining lightweight and packable. When the mercury drops, the Ether Light XT EXTREME 6.2 ASTM R-value will keep you cushioned and insulated from the cold hard lumps and bumps beneath.


The Ether Light XT EXTREME Insulated Air Mat is probably the most comfortable and reliable sleeping air mattress available, that you can take with you all-year round when you are backpacking, bike touring or camping.

  • 10 cm thick air mat provides a plush sleeping experience
  • With two types of insulation to provide all-season warmth
  • Exkin Platinum insulation reflects your radiant heat back to you, dual-density layers of Thermolite insulation prevents convective heat loss
  • Extra thick (XT) loop baffle Air Sprung Cells
  • ASTM R-value 6.2 is designed for cold-weather use
  • Lighter, quieter and durable 30D / 40D face fabric with Sea to Summit’s liquid-extruded lamination is quiet, durable and extremely reliable
  • Quick and easy inflation, deflation and adjustment made possible by the patent-pending multi-function valve and supplied Airstream Pump™/stuff sack
  • Ultra-Fresh anti-microbial treatment to the TPU formula to prevent internal mould growth
  • Multi-function high flow-rate valve provides fast inflate, deflate and easy fine-tuning for personalised comfort
  • Included Pillow Lock system attaches Sea to Summit pillows to mat
  • Quick and easy inflation, deflation and adjustment with the multi-function, high flow-rate valve and supplied Airstream Pump Sack
  • Field repairable with included self-adhesive patches
  • Fabric: 30/40D 100% nylon
  • Size: Regular - 183 x 55 cm
  • Pack size: 17.5 x 24 cm
  • R-value: 6.2
  • Thickness: 10 cm
  • Weight: 720 g
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Sea to Summit Ether Light XT Extreme Insulated Air Sleeping Mat-Regular
Sea to Summit Ether Light XT Extreme Insulated Air Sleeping Mat-Regular