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Sea to Summit Ether Light XT Extreme Insulated Air Sleeping Pad

Sea to Summit Ether Light XT Extreme Insulated Air Sleeping Pad
  • Size: Regular
  • Size: Regular Wide
  • Size: Large
  • Size: Large Wide
$224.25 - $254.25
$299.00 - $339.00
Size: Select size
Please select options Unavailable


Cleverly constructed comfort for the coldest conditions

The Ether Light XT Extreme is extra thick and exceptionally warm. The XT Air Sprung Cells provide 4" of stability and comfort, while dual-density layers of THERMOLITE® insulation prevent convective heat loss and internal air movement. The result: true four-season performance.

Best Use: Backpacking in cold weather or winter conditions

Air Sprung Cell construction makes the Ether Light series more stable than other similarly thick air pads for greater comfort.

Liquid-extruded lamination forms an extremely reliable airproof barrier. The laminate and RF welds are engineered for years of trouble-free performance.

Weight: 720g / 25.4oz (Regular Size)
R-Value - 6.2 (4 Season)

The R-Value of 6.2 is tested according to the ASTM F 3340-18 standard.

Extra thick (XT) Air Sprung Cell construction for 4" stable comfort

Dual-density layers of Thermolite® insulation fill the inner space, preventing heat loss due to convection and internal air movement.

Quick and easy inflation, deflation and adjustment with the multi-function, high flow-rate valve and supplied Airstream™ Pump Sack

Pillow Lock™ attaches an Aeros™ pillow to mat

Lightweight, quiet and grippy 30/40D Nylon face fabric

Repair kit with 3M self-adhesive patches included for puncture repair

Anti-microbial treatment added to the TPU lamination formula prevents internal mold growth

Regular Large Reg Wide Large Wide
Dimensions 183 x 55cm 198 x 64cm 183 x 64cm 201 x 64cm
72 x 21.7in 78 x 25.2 in 72.1 x 25.2 in 79.1 x 25.2 in
Packed Size 17.5 x 24cm 18.5 x 28cm 18.5 x 28cm 18.5 x 28cm
6.9 x 9.4 in 7.3 x 11 in 7.3 x 11in 7.3 x 11 in 
Weight 720g / 25.4oz 950g / 33.5oz 950g / 33.5oz 1050g / 37oz
Pump Sack WT 62 g / 2.2 oz 65 g / 2.3 oz 65 g / 2.3 oz 65 g / 2.3 oz
Thickness 10 cm / 4 in 10 cm / 4 in 10 cm / 4 in 10 cm / 4 in


Warm enough for winter conditions? The tested R-Value of 6.2 and lack of internal air movement (which removes heat loss) make it perfect for four-season use.


Suitable for backpacking? Possibly. The Tapered Regular weighs 25.5 ozs / 720 g – a little heavy for warm weather backpacking, but fine for backpack trips in cold-environments.


Easy to inflate? Yes. The supplied stuff sack features an integrated Airstream Pump – just a few breaths will inflate the mat.


Sea to Summit Ether Light XT Extreme Sleeping Mat

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

Part Numbers

Option UPC MPN Store SKU
Regular 9327868139408 944 SLE519786031
Regular Wide 9327868139422 946 SLE551446181
Large 9327868139415 945 SLE531687591