Sea to Summit Ether Light XR Insulated Air Sleeping Pad

The Sea to Summit Ether Light XR is an insulated air pad that pairs ThermalCore reflective insulation with roughly 9.9 cm of Air Sprung Cell cushioning, giving an ASTM-tested R-value of 4.1 — enough for three-season backpacking including cool nights, though not a dedicated winter pad. At 470 g for a 183 x 55 cm sleeping surface, it's built for hikers who want real cushioning and warmth without the bulk of foam-cored designs. Its weight-per-R-value of 114.6 g is a strong figure, reflecting how much insulation this pad delivers relative to its weight — a clear step up in efficiency from foam-core self-inflating pads. The included Airstream pump sack fills the pad without a separate pump or risking moisture from breath. This suits backpackers and thru-hikers prioritising low pack weight on three-season trips; anyone heading into sustained sub-zero conditions should look at a higher-R-value pad instead.