Therm-a-Rest NeoAir XTherm NXT vs Exped Ultra 8R
In short: The Exped Ultra 8R is warmer by 1.5 points of R-value; the Therm-a-Rest NeoAir XTherm NXT saves 4.5 oz; the Exped Ultra 8R is 3.5 inches thick against 3.
| Spec | Therm-a-Rest NeoAir XTherm NXT | Exped Ultra 8R |
|---|---|---|
| Approx. price | ~$230 | ~$230 |
| R-value | R 7.3 | R 8.8 |
| Season band | Winter | Winter |
| R-value standard | ASTM F3340 | ASTM F3340 |
| Weight | 15.5 oz | 1 lb 4 oz |
| R per ounce | 0.47 R/oz | 0.44 R/oz |
| Thickness | 3 in | 3.5 in |
| Pad type | air | air |
| Inflation | pump sack | pump sack |
| Dimensions | 72 × 20 in | 72 × 20.5 in |
| Packed size | 9 × 4.5 in | 9.1 × 4.9 in |
| Insulation | Four layers of reflective ThermaCapture film over triangular core matrix baffles | Goose down welded into the air chambers |
| Top fabric | 30D | 20D |
Shaded cells mark the row where one has a measurable advantage. Weight, thickness, girth and shape are left unshaded on purpose: heavier is sometimes tougher, wider is sometimes warmer, and calling a winner on those would be an opinion dressed as a measurement.
What each one does well, and costs you
Therm-a-Rest NeoAir XTherm NXT
- 7.3 R-value clears the winter threshold with room to spare, and at 15.5 ounces it does it for less weight than most three-season pads.
- The 70-denier bottom fabric is more than twice the XLite's, which is what lets it live on snow, ice crust and scree.
- Same 3-inch loft and same WingLock valve as the XLite, so nothing about the sleeping experience gets worse in exchange for the warmth.
- Only 2.5 ounces heavier than the XLite — the cheapest warmth upgrade per ounce anywhere in this catalogue.
- Packs to 9 × 4.5 inches, small enough that winter kit doesn't need a bigger pack to hold it.
- The extra film layers make it noticeably crinklier than the XLite, and that is the complaint that comes up most.
- $230 is a serious price for a pad you may only need three or four months of the year.
- Still 20 inches wide in the Regular, so the winter sleeping bag's loft hangs off the sides and gets compressed against the ground.
- Carrying 7.3 R-value on a summer trip is dead weight; it is a specialist pad pretending to be a do-everything one.
Exped Ultra 8R
- R 8.8 is the highest figure in this catalogue, and it comes with 3.5 inches of loft rather than a thin winter mat.
- Down insulation inside the chambers is warmer per ounce than film or batting — twenty ounces for R 8.8.
- Silent, and warm the moment you lie on it.
- Same price in all three sizes.
- Down inside a pad means breath inflation is genuinely damaging over time; the pump bag is mandatory, not a convenience.
- $230 and R 8.8 is far more pad than any three-season trip needs.
- 20-denier fabric wrapping $230 of down on ground that is by definition frozen and sharp.
- Packed at 9.1 × 4.9 inches it is the bulkiest of the Ultra line.