Compare the documented Regular Mummy and Large versions. This is a source-based specification comparison, not a field test or a current price ranking.
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The useful difference
R-value describes controlled thermal resistance; width and length decide practical fit. A higher R-value is not a measured temperature guarantee, and a thick pad is not automatically warmer. The listed R-values are 8.5 and 7.3, respectively; check each test-method note before treating that difference as comparable.
Exact versions compared
NEMO Tensor Extreme Conditions — Regular Mummy and Therm-a-Rest NeoAir XTherm NXT — Large. Other sizes may change the result.
Specifications side by side
| Metric | NEMO Tensor Extreme Conditions — Regular Mummy | Therm-a-Rest NeoAir XTherm NXT — Large |
|---|---|---|
| R-value | 8.5 | 7.3 |
| Listed weight | 1.04 lb (472 g) | 1.26 lb (570 g) |
| Length | 72.0 in (183 cm) | 77.0 in (196 cm) |
| Width | 20.0 in (51 cm) | 25.0 in (64 cm) |
| Thickness | 3.5 in (9 cm) | 3.0 in (8 cm) |
| Packed length | 10.0 in (25 cm) | 11.0 in (28 cm) |
“Not verified” is an unknown value. It is never zero or proof that a feature is absent.
Search the exact model names on Amazon
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Search for NEMO Tensor Extreme Conditions and check the exact size, revision and seller details before ordering.
(paid link)Search this model on AmazonAmazon search results may include different variants or sellers. No price or stock is verified here.Search for Therm-a-Rest NeoAir XTherm NXT and check the exact size, revision and seller details before ordering.
(paid link)Search this model on AmazonAmazon search results may include different variants or sellers. No price or stock is verified here.How to choose
R-value describes controlled thermal resistance; width and length decide practical fit. A higher R-value is not a measured temperature guarantee, and a thick pad is not automatically warmer. The listed R-values are 8.5 and 7.3, respectively; check each test-method note before treating that difference as comparable.
Open each record to inspect the source for the exact figure and its revision notes: NEMO Tensor Extreme Conditions — Regular Mummy; Therm-a-Rest NeoAir XTherm NXT — Large. The comparison has 6 shared numerical fields. Consider your shelter floor, sleep position and expected conditions with the sleep system builder.
What this comparison cannot establish
Neither listing verifies live inventory, price, independent durability, noise, waterproof performance in a storm, or comfort for every sleeper. Where a manufacturer gives conflicting figures, the product record preserves the discrepancy and may omit a normalized number.
Sources and further reading
Source pages and product listings can change. Specifications were assembled from the supplied dataset as of October 30, 2026; current availability is not guaranteed.
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