Sea to Summit Ether Light XR Pro Insulated Air Sleeping Pad

The Sea to Summit Ether Light XR Pro is a four-season insulated air pad built for genuine cold-weather use, with multi-layer ThermalCore insulation and 10 cm of Air Sprung Cell cushioning giving an ASTM-tested R-value of 7.4 — high enough for winter camping and sustained sub-zero nights, not just a cold three-season buffer. At 560 g for a 183 x 55 cm pad, it holds that warmth without the weight penalty of a foam-core pad at a similar R-value. Its weight-per-R-value of 75.7 g is a strong figure, reflecting how much insulation this pad delivers relative to its weight for genuine four-season use — noticeably better than the standard Ether Light XR's 114.6 g per R-value despite the jump in warmth. The Airstream pump sack keeps the pad dry inside by avoiding breath moisture during inflation. This suits winter backpacking, alpine trips and cold-weather expeditions where the R-value 7.4 is doing real work; for three-season trips it will be more pad — and more cost — than necessary.