A backpacking or tenting sleeping pad’s R-value measures its resistance to warmth loss to the bottom whenever you lie on it at evening. Pads with greater R-values do that extra successfully than pads with decrease R-values. R-value isn’t a measure of heat per se, however of a pad’s means to forestall the lack of the heat that your physique generates. It’s identical to the R-value used to charge residence insulation.
Sleeping Pad R-Values and Air Temperature in Levels
What’s the correlation between air temperature and sleeping pad R-values? When do you want a pad with the next R-value? This desk relies on Exped’s suggestions in Fahrenheit and Celsius levels.
| Air Temperature (F): | 50 | 30 | 25 | 10 | 0 | -15 | -25 | -40 |
| Minimal R-Worth | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Air Temperature (C): | 10 | -1 | -4 | -12 | -18 | -26 | -32 | -40 |
| Minimal R-Worth | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
As well as:
- R-values are additive, so you may mix two pads to extend your heat stage. For instance, it’s frequent to hold a foam sleeping pad (often R=2) in winter to make use of as a sit pad when consuming and melting snow that you would be able to place below an inflatable pad to extend their mixed R-value for sleeping.
- Ladies want greater R-values pads as a result of they’ve decrease physique mass than males. A further R-value of 1 is often a great hedge for girls and different chilly sleepers.
- If a pad mannequin has a number of sizes, all of them have the identical R-value except specified in any other case
- EN sleeping bag temperature scores are predicated on utilizing a sleeping pad with an R-value of 5 or greater. If you end up sleeping chilly in temperatures the place you’d count on your sleeping bag ought to preserve you heat, it might be as a result of your sleeping pad has an R-value lower than 5.
Sleeping Pad R-Worth Comparability
The next desk offers a side-by-side comparability of the ASTM F3340-18 rated sleeping pads obtainable within the US market. The pad weights listed are sized for 72″ lengthy x 20″ extensive pads, although there are a couple of exceptions under. The R-Worth of a pad stays the identical if you choose an extended, shorter, or wider variation of the pad.
Key: Air – Air Mattress, SI – Self Inflating, Foam – Closed Cell Foam
Sleeping Pad R-Worth Commonplace
In 2020, the out of doors {industry} rolled out a world and industry-standard R-value check process referred to as ASTM F3340-18. This implies you may evaluate the R-values of various sleeping pads made by completely different producers and know that they’re all utilizing the identical check process to measure the R-values of their pads. That’s an enormous profit for customers and can finally have the identical affect that the adoption of standardized sleeping pad temperature scores had for evaluating sleeping luggage from completely different corporations.
The businesses which have adopted the brand new R-value sleeping pad commonplace (ASTM F3340-18) and retested all of their present sleeping pads embody:
- Therm-a-Relaxation
- NEMO
- REI
- Exped
- Sea-to-Summit
- Massive Agnes
- Klymit
What’s New in Sleeping Pads in 2023?
- Thermarest has come out with a brand new NeoAir NXT era of pads which might be quieter, thicker, and have a barely greater R-value than the final era NeoAir pads. I don’t suppose the modifications actually warrant changing your current NeoAir pad although, however the modifications ought to be enticing to new purchasers.
- Massive Agnes has a handful of recent light-weight pads which might be 3+ season succesful. They’re not broadly obtainable in retail but, however they make good gear and could be an fascinating different.
- Klymit continues to have an impenetrable product naming scheme. I don’t get it.
Standing of Trade Adoption
The adoption of the brand new R-Worth commonplace was pushed by REI, which requires that the sleeping pads listed on the market on its important web site have an ASTM F3340-18 R-Worth score.
Many sleeping pad corporations have nonetheless not adopted the brand new ASTM F3340-18 sleeping pad R-Worth commonplace and it’s not clear that they ever will. Actually, many producers don’t check their pads in any respect, however “estimate” the R-values of their sleeping mats and pads. Within the absence of an ordinary definition and check process, it’s onerous to inform if their estimates are correct or whether or not they’re corresponding to these produced by the usual ASTM F3340-18 R-value testing protocol.
Up to date December 22, 2023.
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