Therm-a-Rest NeoLoft vs NEMO Tensor Extreme Conditions
In short: The Therm-a-Rest NeoLoft costs $10 less; the NEMO Tensor Extreme Conditions is warmer by 3.8 points of R-value; the NEMO Tensor Extreme Conditions saves 7.0 oz; the Therm-a-Rest NeoLoft is 4.6 inches thick against 3.5.
| Spec | Therm-a-Rest NeoLoft | NEMO Tensor Extreme Conditions |
|---|---|---|
| Approx. price | ~$250 | ~$260 |
| R-value | R 4.7 | R 8.5 |
| Season band | Cold three-season | Winter |
| R-value standard | ASTM F3340 | ASTM F3340 |
| Weight | 1 lb 9 oz | 1 lb 2 oz |
| R per ounce | 0.19 R/oz | 0.47 R/oz |
| Thickness | 4.6 in | 3.5 in |
| Pad type | air | air |
| Inflation | pump sack | pump sack |
| Dimensions | 73 × 22 in | 72 × 20 in |
| Packed size | 9.5 × 5.7 in | 10 × 4.5 in |
| Insulation | Reflective film over a stabilised air core, under a stretch-knit face | Four suspended layers of aluminised Thermal Mirror film inside Spaceframe baffles |
| Top fabric | 50D | 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 NeoLoft
- 4.6 inches of loft is the deepest backpacking pad here, and it is the difference between a hip that bottoms out and one that doesn't.
- The 50-denier stretch-knit top is quiet and warm to the touch — none of the crinkle or the clammy plastic feel of a reflective-film pad.
- 22 inches wide as standard rather than 20, with a 26-inch Wide above it.
- 4.7 R-value covers the same three-season range as an XLite, so the comfort doesn't cost warmth.
- Heavier fabric means it tolerates a tent floor without a groundsheet better than the ultralight pads do.
- 25 ounces is twice an XLite and puts it within a few ounces of self-inflating pads that cost $100 less.
- Packs to 9.5 × 5.7 inches — noticeably bulkier in a small pack than the pad it is meant to replace.
- Thick pads sit you high off the ground, which makes a narrow tent feel narrower and a quilt's draft gap harder to seal.
- New enough in 2025 that its long-term seam and valve record is still being written.
NEMO Tensor Extreme Conditions
- 8.5 is the highest R-value in this catalogue — 1.2 points above the next warmest, the XTherm NXT.
- Achieves it at 18 ounces, which is lighter than several three-season self-inflating pads.
- Keeps the All-Season's quiet suspended-film construction rather than going back to a crinkly laminate.
- 3.5 inches of loft means it is also the most comfortable of the winter pads.
- Mummy, rectangular and wide versions, so a winter bag's loft doesn't have to hang off the edges.
- $260 to $300 depending on size, which is a lot of pad for a use case that might be four nights a year.
- R 8.5 on a summer trip is pure carried weight; this is a specialist, not a quiver-of-one.
- The 20-denier top fabric is the same thin material as the three-season pads, on a pad that lives on ice and rock.
- The extra film layers push the packed size to 10 × 4.5 inches.