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.
  • BEST USE: Cold Weather Backpacking
  • COMES WITH: Stuff sack w/ integrated pump, repair kit & Pillow Lock
  • FABRIC: Durable 30D/40D nylon
  • R-VALUE: 6.2
  • SEASON RATING: 4 Season
  • SPECIAL: Anti-microbial liquid-extruded TPU lamination to reduce delamination
  • THICKNESS: 4 in / 10 cm
  • DIMENSIONS: 72 x 21.7in / 183 x 55cm
  • PACKED SIZE: 6.9 x 9.4 in / 17.5 x 24cm
  • STUFF/ PUMP SACK WEIGHT: 2.2 oz / 62 g
  • THICKNESS: 4 in / 10 cm
  • WEIGHT: 25.4oz / 720g





Country of OriginImported
Style Number2072876
Product SKU35395300006
Shipping & Returns
Quick Delivery
View shipping options
Easy Returns, Refunds & Exchanges
View returns policy