Verdict: The Therm-a-Rest NeoAir XLite NXT delivers a higher R-value of 4.5 and weighs 3.5 oz less than the Sea to Summit Ether Light XT's 4.2 R-value and 16 oz weight. The Ether Light XT counters with 4 inches of thickness versus 3 inches for superior pressure relief. Owner feedback on sites like REI and Backpacking Light consistently notes the NeoAir's edge in multi-day backpacking scenarios.
Winner: Therm-a-Rest NeoAir XLite NXT
Therm-a-Rest NeoAir XLite NXT: 8.5/10
Sea to Summit Ether Light XT: 7.5/10
| Therm-a-Rest NeoAir XLite NXT | Sea to Summit Ether Light XT | |
|---|---|---|
| R-value | 4.5 | 4.2 |
| Thickness | 3 inches | 4 inches |
| Weight | 12.5 oz | 16 oz |
| Packed Size | 9 x 4 inches | 10 x 5 inches |
Our pick: Therm-a-Rest NeoAir XLite NXT. It edges out the alternative on excellent warmth-to-weight ratio. That said, Sea to Summit Ether Light XT still wins on thicker profile for better pressure relief — consider it if that single trade matters most for your use.
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