Sea to Summit Ether Light XR Pro Insulated Sleeping Mat
With 10 cm of Air Sprung Cell comfort and an ASTM-tested R-value of 7.4, the Ether Light XR Pro is built for winter camping, mountaineering and cold-weather backpacking without the usual bulk of a high-insulation mat.
Five layers of Sea to Summit's quiet ThermalCore insulation reflect warmth back towards the sleeper while reducing internal air movement. The plush Air Sprung Cell surface remains stable in different sleeping positions, and the integrated Airstream pump sack makes camp setup quick and straightforward.
Why choose the Ether Light XR Pro?
- Four-season insulation: ASTM F3340 tested R-value of 7.4 for cold ground and winter use.
- 10 cm of cushioned support: Air Sprung Cells reduce pressure points and provide stable comfort for back, side and front sleepers.
- Quiet ThermalCore construction: five soft TRM layers reflect infrared warmth without the crinkly feel associated with traditional reflective films.
- More packable than the previous generation: 25% lighter and approximately half the packed size.
- Fast inflation and adjustment: the stuff sack doubles as an Airstream pump sack, paired with a high-flow XPRESS valve.
- Stronger construction: double the weld strength of previous models.
- 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 |
|---|---|---|---|---|---|
| Regular | 183 × 55 × 10 cm | 560 g | 620 g | 21 × 12 × 12 cm | Up to 183 cm |
| Regular Rectangular Wide | 183 × 64 × 10 cm | 720 g | 780 g | 24 × 13.5 × 13.5 cm | Up to 183 cm |
| Large | 198 × 64 × 10 cm | 720 g | 780 g | 24 × 12.5 × 12.5 cm | Up to 198 cm |
Shape guide: Regular and Large are tapered to reduce weight and packed volume. 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
- R-value: 7.4 (ASTM F3340 tested)
- Thickness: 10 cm
- Mat: 100% nylon
- Valve: 100% TPU
- Stuff sack: 100% nylon
- Treatment: non-PFAS and flame-retardant free
XR Pro or XR?
Choose the Ether Light XR Pro for winter camping, alpine use and cold ground. For extended three-season trips where lower weight matters more than maximum insulation, the Ether Light XR has an R-value of 4.1.
Frequently asked questions
Is the ThermalCore insulation noisy?
Sea to Summit uses softer reflective materials that are not held under stress inside the mat, so they are quieter than traditional reflective-film baffles. Some contact noise can still occur between the face fabric, sleeping bag and tent floor.
Can I use the XR Pro for winter camping?
Yes. Sea to Summit states that its ThermalCore insulation is suitable for air and ground temperatures well below freezing. In critical conditions, the brand recommends carrying a closed-cell foam mat as a backup insulating layer.
Can I inflate it by mouth?
Yes, but the integrated Airstream pump sack is faster and helps reduce breath condensation inside the mat.
