ASTM F3340 measures pad thermal resistance with a guarded hot/cold plate under controlled compression.
How to use this answer
Use it for comparison, while allowing for edge loss and real sleeping posture. This separates a useful measurement from a broad product label and helps identify which exact variant needs further checking.
Decision boundary
The listed values describe a product under its stated source conditions. They do not establish personal comfort, safety, stock, or fit in every shelter.
Insulation and dimension context
ASTM F3340-22 measures thermal resistance under controlled compression. Its R-value helps compare pads but cannot predict a universal safe air temperature; thickness is a different property. Check the exact variant and test method before using a number.
For this question, check: R-value and method, length, narrowest usable width, packed weight and repair needs. When a particular specification is absent, keep the decision open rather than treating a missing value as zero or assuming a universal fit.
Compare actual recorded values
The values below come from exact catalog variants. The table is an illustration of which measurements to compare, not a ranking or a recommendation. Open each card for the field source and revision notes.
| Exact variant | R-value | Listed weight | Thickness |
|---|---|---|---|
| EXPED Ultra 6.5R — MW | 6.9 | 1.19 lb (539 g) | 3.5 in (9 cm) |
| Klymit Static V BASE — Regular | 1.3 | 1.17 lb (530 g) | 2.5 in (6 cm) |
| NEMO Switchback — Short | 2 | 0.66 lb (300 g) | 0.9 in (2 cm) |
These records illustrate how the reported measurements and source links are presented; they are not personal field tests or ranked recommendations.
Before you rely on a number
Recheck manufacturer instructions and the exact year, size and SKU. The October 30, 2026 dataset does not verify real-time inventory, sale prices, field performance or a guaranteed safe temperature. If the key measurement for this question is unavailable, ask the maker or measure your own equipment before committing to a setup.
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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