These two are the ultralight air pad benchmark, and you'll see both recommended endlessly on r/Ultralight and in Backpacker's annual gear guides. The NeoAir XLite NXT is the refined successor to one of the most popular pads ever made; the Sea to Summit Ether Light XT challenges it on warmth-to-weight ratio and side-sleeper comfort.
Therm-a-Rest NeoAir XLite NXT
The NeoAir XLite NXT is the better all-around pad; the Ether Light XT wins for side sleepers who prioritize comfort per ounce.
Specs Comparison
| Spec | Therm-a-Rest NeoAir XLite NXT | Sea to Summit Ether Light XT |
|---|---|---|
| MSRP | ~$200 | ~$180 |
| Weight (Regular) | 12 oz / 340g | 16 oz / 454g |
| R-Value | 4.5 | 3.2 |
| Thickness | 2.5 in | 3.1 in |
| Top Fabric | 70d polyester | 30d nylon |
| Noise | Some crinkle | Quiet |
R-Value and Warmth
The NeoAir XLite NXT has an R-value of 4.5 — meaningfully warmer than its predecessor and competitive with pads twice its weight. The Ether Light XT Regular comes in at R 3.2, which suits three-season use but isn't suitable below freezing.
If you camp in cold shoulder-season temps or at altitude, the NeoAir's higher R-value is a real advantage. Both are ASTM-tested, so the numbers are comparable.
Weight and Packability
The NeoAir XLite NXT Regular weighs 12 oz and packs to about the size of a water bottle. The Ether Light XT Regular comes in at 16 oz — heavier, but still very light for the comfort it offers.
For gram-counters, the NeoAir is hard to beat. The Ether Light's extra ounces buy you a noticeably cushier sleep surface.
Comfort and Noise
The NeoAir's crinkling noise is a known trade-off — it's quieter than earlier versions of the pad, but it still makes noise when you shift. The Ether Light XT is quieter with a softer 30d fabric.
The Ether Light's larger cell structure feels plusher, particularly for side sleepers whose hips and shoulders need cushioning. The NeoAir is firmer and more stable.
Durability and Price
Both pads use thin fabrics that require care — avoid rocky ground without a footprint or ground cloth. The NeoAir uses 30d and 70d fabrics on different models; the Ether Light XT uses 30d on both sides.
The NeoAir XLite NXT retails around $200; the Ether Light XT is around $180. Neither has a clear price advantage.
Therm-a-Rest NeoAir XLite NXT Strengths
- R-value of 4.5 extends three-season use into cold nights
- Weighs 12 oz — lighter than the Ether Light XT
- Packs to water-bottle size for pack-space-conscious hikers
Sea to Summit Ether Light XT Strengths
- Quieter fabric — no crinkle noise when shifting at night
- Softer cell structure is better for side sleepers
- Slightly cheaper than the NeoAir XLite NXT
Therm-a-Rest NeoAir XLite NXT Weaknesses
- Crinkle noise when shifting is noticeable and can wake light sleepers
- Firmer feel takes some adjustment for side sleepers
Sea to Summit Ether Light XT Weaknesses
- R-value of 3.2 isn't sufficient for below-freezing nights
- Heavier than the NeoAir by about 4 oz
- 30d fabric on both faces needs careful campsite selection
Best For
- a: Ultralight backpackers and cold-weather campers who need R-value under 1 lb
- b: Side sleepers and comfort-focused backpackers in three-season conditions
FAQ
Is the NeoAir XLite NXT really quieter than previous versions?
Yes — Therm-a-Rest redesigned the internal baffles for the NXT, and most users find it noticeably quieter than the original XLite, though some noise remains.
Can these pads be inflated by mouth?
Both come with a small pump sack that inflates the pad in a few minutes without mouth moisture, which is best practice for longevity.
Which pad is more durable?
Both use thin fabrics and require care. The NeoAir's 70d bottom is slightly more puncture-resistant than the Ether Light XT's 30d on both sides.