A backpacking or tenting sleeping pad’s R-value measures its resistance to warmth loss to the bottom if you lie on it at evening. Pads with larger 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 stop 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 a better 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 degree. 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 you can place below an inflatable pad to extend their mixed R-value for sleeping.
- Ladies want larger R-values pads as a result of they’ve decrease physique mass than males. An extra R-value of 1 is often a superb hedge for ladies 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 larger. If you end up sleeping chilly in temperatures the place you’d anticipate your sleeping bag ought to preserve you heat, it could be as a result of your sleeping pad has an R-value lower than 5.
Sleeping Pad R-Worth Comparability
The next desk gives 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″ vast pads, although there are a couple of exceptions beneath. 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 Customary
In 2020, the outside {industry} rolled out a global and industry-standard R-value take a look at process known as ASTM F3340-18. This implies you may evaluate the R-values of various sleeping pads made by totally different producers and know that they’re all utilizing the identical take a look at process to measure the R-values of their pads. That’s an enormous profit for shoppers and can finally have the identical affect that the adoption of standardized sleeping pad temperature scores had for evaluating sleeping luggage from totally different firms.
The businesses which have adopted the brand new R-value sleeping pad customary (ASTM F3340-18) and retested all of their present sleeping pads embrace:
- Therm-a-Relaxation
- NEMO
- REI
- Exped
- Sea-to-Summit
- Large Agnes
- Klymit
What’s New in Sleeping Pads in 2023?
- Thermarest has come out with a brand new NeoAir NXT technology of pads which can be quieter, thicker, and have a barely larger R-value than the final technology NeoAir pads. I don’t suppose the adjustments actually warrant changing your current NeoAir pad although, however the adjustments must be engaging to new purchasers.
- Large Agnes has a handful of latest light-weight pads which can be 3+ season succesful. They’re not broadly obtainable in retail but, however they make good gear and is perhaps an fascinating various.
- 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 customary was pushed by REI, which requires that the sleeping pads listed on the market on its most important web site have an ASTM F3340-18 R-Worth ranking.
Many sleeping pad firms have nonetheless not adopted the brand new ASTM F3340-18 sleeping pad R-Worth customary and it’s not clear that they ever will. In truth, many producers don’t take a look at their pads in any respect, however “estimate” the R-values of their sleeping mats and pads. Within the absence of an ordinary definition and take a look at 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 January 17, 2023.
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