Highlights
BEST USE: Cold Weather Backpacking
WEIGHT: 1lb 9oz | 720g
PERFORMANCE: 4 Season
PACKED SIZE: 6.9 x 9.4 in | 17.5 x 24cm
Description
The Ether Light XT Extreme is extra thick and exceptionally warm. The XT Air Sprung Cells provide four inches of stability and comfort, while dual-density layers of THERMOLITE® insulation prevent convective heat loss and internal air movement. This results in true four-season performance. Features 6.2 R-Value ...
Product Details
- 6.2 R-Value is perfect for cold weather adventures.
- At four inches thick, Ether Light XT Air Sprung Cells provides a plush sleeping experience.
- Dual-density layers of Thermolite® insulation fill the inner space, preventing heat loss due to convection and internal air movement.
- Lighter, quieter and durable 30D/40D face fabric with Sea to Summit’s liquid-extruded lamination is extremely reliable.
- Quick and easy inflation, deflation and adjustment is made possible by our multi-function valve and supplied Airstream Pump/stuff sack.
- Anti-microbial treatment added to the TPU lamination formula prevents internal mold growth.
- PillowLock system prevents your Sea to Summit Aeros Pillow from slipping.
- Comes with a stuff sack which doubles as a pump, a repair kit with six self-adhesive patches and a spare valve insert.
Shipping & Returns
We use climate-neutral shipping:
DHL GoGreen for orders to Germany, Austria and Czech Republic and
GLS Klima Protect for orders to Belgium, Denmark, France, Italy, the Netherlands, Luxembourg, Sweden and Norway.
All orders received by 12:00 noon on weekdays are usually shipped the same day. Orders received later are usually dispatched the following working day.
Delivery time can take up to 3 working days Germany-wide, 4 working days for orders to AT, BE, CZ, DK, FR, IT, LU, NL & SE and 6 working days for orders to CH & NO and depends on the shipping service provider.
Shipping cost within EU / Switzerland:
For orders with a value below 75€/ 650 DKK/ 1000 SEK/ 100 CHF we charge a shipping fee of 4,95€/ 80 DKK/ 150 SEK/ 6,90 CHF. We do not charge shipping fees for orders with a value over 75€/ 650 DKK/ 1000 SEK/ 100 CHF.
Shipping cost to Norway:
We charge a shipping fee of 120 NOK for all orders.
All orders can be returned within 14 days of purchase. However, for the sake of the environment, please make sure to keep returns as low as possible.


Description
The Ether Light XT Extreme is extra thick and exceptionally warm. The XT Air Sprung Cells provide four inches of stability and comfort, while dual-density layers of THERMOLITE® insulation prevent convective heat loss and internal air movement. This results in true four-season performance.
- 6.2 R-Value is perfect for cold weather adventures.
- At four inches thick, Ether Light XT Air Sprung Cells provides a plush sleeping experience.
- Dual-density layers of Thermolite® insulation fill the inner space, preventing heat loss due to convection and internal air movement.
- Lighter, quieter and durable 30D/40D face fabric with Sea to Summit’s liquid-extruded lamination is extremely reliable.
- Quick and easy inflation, deflation and adjustment is made possible by our multi-function valve and supplied Airstream Pump/stuff sack.
- Anti-microbial treatment added to the TPU lamination formula prevents internal mold growth.
- PillowLock system prevents your Sea to Summit Aeros Pillow from slipping.
- Comes with a stuff sack which doubles as a pump, a repair kit with six self-adhesive patches and a spare valve insert.
Technical Features

XPRESS Valve

Thermolite HL-1

Integrated Airstream

ASTM F3340 R-Value Testing
Tech specs
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Best UseCold Weather Backpacking
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Comes WithStuff sack w/ integrated pump, repair kit & Pillow Lock
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FabricDurable 30D/40D nylon
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R-Value6.2
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Season Rating4 Season
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SpecialAnti-microbial liquid-extruded TPU lamination to reduce delamination
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Thickness4 in / 10 cm
Regular | Large | Rec. Reg Wide | Rec. Large | |
---|---|---|---|---|
Dimensions | 72 x 21.7in 183 x 55cm | 78 x 25.2 in 198 x 64cm | 72.1 x 25.2 in 183 x 64cm | 79.1 x 25.2 in 201 x 64cm |
Packed Size | 6.9 x 9.4 in 17.5 x 24cm | 7.3 x 11 in 18.5 x 28cm | 7.3 x 11in 18.5 x 28cm | 7.3 x 11 in 18.5 x 28cm |
Stuff Sack Weight | 2.2 oz 62 g | 2.3 oz 65 g | 2.3 oz 65 g | 2.3 oz 65 g |
Weight | 25.4oz 720g | 33.5oz 950g | 33.5oz 950g | 37oz 1050g |