Plush 10 cm comfort, an ASTM-tested R-value of 4.1 and a compact packed size make the Ether Light XR a strong choice for tramping, backpacking and bikepacking across extended three-season conditions.
Sea to Summit's Air Sprung Cell construction supports the body like hundreds of small springs, creating a stable surface that stays comfortable whether you sleep on your back, side or front. Three layers of ThermalCore insulation reflect warmth back towards you while limiting internal air movement, without the bulk of conventional insulation.
Why choose the Ether Light XR?
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10 cm of cushioned support: Air Sprung Cells reduce pressure points and provide stable comfort in any sleeping position.
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Extended three-season warmth: ASTM F3340 tested R-value of 4.1, suitable for conditions where a hard frost may occur.
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Fast, moisture-conscious inflation: the stuff sack doubles as an Airstream pump sack, while the high-flow XPRESS valve makes inflation, fine adjustment and deflation simple.
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Smaller and lighter than earlier Ether Light models: easier to carry without giving up the plush feel the range is known for.
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Built for repeat use: increased weld strength improves durability.
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PillowLock compatible: included patches help keep a Sea to Summit Aeros pillow in place.
Choose the right size
| Size |
Mat dimensions |
Mat weight |
Packed weight |
Packed size |
Recommended user height |
| Small |
168 × 55 × 10 cm |
445 g |
500 g |
20.5 × 11 × 11 cm |
Up to 168 cm |
| Regular |
183 × 55 × 10 cm |
470 g |
525 g |
20.5 × 11 × 11 cm |
Up to 183 cm |
| Regular Rectangular Wide |
183 × 64 × 10 cm |
605 g |
665 g |
24 × 12 × 12 cm |
Up to 183 cm |
| Large |
198 × 64 × 10 cm |
605 g |
665 g |
24 × 11.5 × 11.5 cm |
Up to 198 cm |
Shape guide: Small, Regular and Large are tapered to save weight and pack space. Regular Rectangular Wide provides more room through the shoulders and legs.
What's included
- Stuff sack with integrated Airstream pump sack
- PillowLock patches
- Repair kit
Materials and specifications
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R-value: 4.1 (ASTM F3340 tested)
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Thickness: 10 cm
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Mat: 100% nylon
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Valve: 100% TPU
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Stuff sack: 100% nylon
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Treatment: non-PFAS and flame-retardant free
XR or XR Pro?
Choose the Ether Light XR for lower weight and extended three-season use. If winter camping, alpine trips or well-below-freezing ground conditions are on the agenda, consider the Ether Light XR Pro with its R-value of 7.4.
Frequently asked questions
How cold can the Ether Light XR handle?
Sea to Summit describes its R-value of 4.1 as suitable for conditions where a hard frost may occur. Ground temperature, sleeping bag warmth, shelter and the sleeper all affect overall comfort.
Can I inflate it by mouth?
Yes. Mouth inflation generally takes more than 20 breaths, while the integrated pump sack fills the mat in only a few cycles and helps reduce breath condensation inside the mat.
Does it work with Sea to Summit pillows?
Yes. The included PillowLock patches are designed to secure an Aeros pillow and reduce slipping during the night.
