Sleeping Pad R-Values of 2022

Sleeping Pad R-Values of 2022

A backpacking or camping sleeping pad’s R-value measures its resistance to heat loss to the ground when you lie on it at night. Pads with higher R-values do this more effectively than pads with lower R-values. R-value isn’t a measure of warmth per se, but of a pad’s ability to prevent the loss of the warmth that your body generates. It’s just like the R-value used to rate home insulation.

Sleeping Pad R-Values and Air Temperature in Degrees

What’s the correlation between air temperature and sleeping pad R-values? When do you need a pad with a higher R-value? This table is based on Exped’s recommendations in Fahrenheit and Celsius degrees.

Air Temperature (F):503025100-15-25-40
Minimum R-Value12345678
Air Temperature (C):10-1-4-12-18-26-32-40
Minimum R-Value12345678

In addition:

  • R-values are additive, so you can combine two pads to increase your warmth level. For example, it’s common to carry a foam sleeping pad (usually R=2) in winter to use as a sit pad when eating and melting snow that you can place under an inflatable pad to increase their combined R-value for sleeping.
  • Women need higher R-values pads because they have lower body mass than men. An additional R-value of 1 is usually a good hedge for women and other cold sleepers.
  • If a pad model has multiple sizes, they all have the same R-value unless specified otherwise
  • EN sleeping bag temperature ratings are predicated on using a sleeping pad with an R-value of 5 or higher. If you find yourself sleeping cold in temperatures where you’d expect your sleeping bag should keep you warm, it may be because your sleeping pad has an R-value less than 5.

Sleeping Pad R-Value Comparison

The following table provides a side-by-side comparison of the  ASTM F3340-18 rated sleeping pads available in the US market. The pad weights listed are sized for 72″ long x 20″ wide pads, though there are a few exceptions below. The R-Value of a pad remains the same if you select a longer, shorter, or wider variation of the pad.

Key: Air – Air Mattress, SI – Self Inflating, Foam – Closed Cell Foam

Make / ModelR-ValueMin Weight (Oz)ThicknessType
Therm-a-Rest NeoAir XLite4.2122.5"Air
Therm-a-Rest NeoAir XLite Women's5.4122.5"Air
Therm-a-Rest NeoAir XTherm6.9152.5"Air
Therm-a-Rest NeoAir XTherm Max6.9192.5"Air
Therm-a-Rest NeoAir UberLite2.38.82.5"Air
Therm-a-Rest Basecamp6402"Air
Therm-a-Rest LuxuryMap6523"Air
Therm-a-Rest MondoKing 3D7704.25"Air
Therm-a-Rest NeoAir Camper Duo2.5733"Air
Therm-a-Rest NeoAir Venture2.2192"Air
Therm-a-Rest Original Z Lite1.7140.75"Foam
Therm-a-Rest ProLite2.4181"SI
Therm-a-Rest ProLite Apex3.8222"SI
Therm-a-Rest ProLite Plus3.2231.5"SI
Therm-a-Rest ProLite Plus Women's3.9221.5"SI
Therm-a-Rest ProLite Women's2.7181"SI
Therm-a-Rest Ridegrest Classic2140.625"Foam
Therm-a-Rest RidgeRest SOLite2.1140.625"Foam
Therm-a-Rest NeoAir Topo2.3233"Air
Therm-a-Rest NeoAir Topo Luxe3.7234"Air
Therm-a-Rest Trail Lite3.2261.5"SI
Therm-a-Rest Trail Lite Women's4.5251.5"SI
Therm-a-Rest Trail Pro4.4293"SI
Therm-a-Rest Trail Scout3.1241"SI
Therm-a-Rest Z Lite Sol2140.75"Foam
NEMO Switchback UL214.50.9"Foam
NEMO Tensor Alpine UL4.8173"Air
NEMO Tensor UL Insulated4.2153"Air
NEMO Tensor UL Non-insulated2.513.83"Air
NEMO Roamer SI61204"SI
NEMO Astro Insulated2.6243.5"Air
NEMO Astro Non-Insulated1.5193.5"Air
NEMO Astro Lite Insulated2.6183.5"Air
NEMO Astro Lite Non-Insulated1.5143.5"Air
NEMO Flyer3.3232"Air
NEMO Quasar 3D Insulated3.3303.5"Air
NEMO Quasar 3D Non-Insulated1.8243.5"Air
Sea-to-Summit Ether Light XT Insulated Air3.217.34"Air
Sea-to-Summit Ether Light XT Insulated Air Women's3.517.54"Air
Sea-to-Summit Ultralight Air 1.113.92"Air
Sea-to-Summit Ultralight Insulated Air Women's3.515.82"Air
Sea-to-Summit Ultralight Insulated Air3.116.92"Air
Sea-to-Summit Comfort Light Insulated Women's3.823.52"Air
Sea-to-Summit Comfort Light Insulated Air3.721.92"Air
Sea-to-Summit Comfort Plus Insulated Air429.82.5"Air
Sea-to-Summit Comfort Plus XT Insulated Air4.741.83"Air
Sea-to-Summit Comfort Deluxe SI6.5704"SI
Sea-to-Summit Comfort Plus SI4.1343.125"SI
Sea-to-Summit Comfort Plus Women's SI5.133.53.125"SI
Sea-to-Summit Ultralight SI2.6191"SI
Sea-to-Summit Ultralight Women's SI2.919.21"SI
Sea-to-Summit Comfort Light SI3.1232"SI
Sea-to-Summit Comfort Light Women's SI3.823.52"SI
Sea-to-Summit Camp SI4.2271.5"SI
Sea-to-Summit Ether Light XT Air1.213.84"Air
Sea-to-Summit Ether Light XT Extreme Insulated Air6.225.44"Air
Sea-to-Summit Ether Light XT Extreme Insulated Women's Air6.324.24"Air
Sea-to-Summit Camp Plus SI4.3313"SI
Big Agnes Insulated Q-Core SLX3.2183.5"Air
Big Agnes Insulated Q Core Deluxe4.3253.5"Air
Big Agnes Insulated AXL Air3143.25"Air
Big Agnes Insulated Air Core Ultra4.5223.25"Air
Big Agnes Air Core Ultra1.4183.25"Air
Big Agnes Insulated SLX Tent Floor3.2433.5"Air
Big Agnes Hinman5341.5"SI
Big Agnes Two Track3.3212"SI
Big Agnes Twistercane BioFoam Pad1.7140.5"Foam
Big Agnes Rapide SL4.2193.5"Air
REI Trailbreak SI5.1401.75"SI
REI Trailbreak SI Women's5.3371.75"SI
REI Kindercamp4.5291.5"SI
REI Camp Bed SI7.6582.5"SI
REI Camp Dreamer XL SI6.61024"SI
REI Camp Dreamer Double SI6.61494"SI
REI AirRail Plus3.3251.5"SI
REI Air Rail Plus Women's3.7251.5"SI
REI Camp Dreamer Insulated2.7544"Air
REI Helix Insulated4.9213"Air
Exped Ultra 1R1.313.93"Air
Exped Ultra 1R Duo1.325.43"Air
Exped Ultra 5R4.8203"Air
Exped Ultra 3R Duo2.9293"Air
Exped Ultra 7R7.1223.5"Air
Exped Ultra 3R2.9163"Air
Exped Dura 3R2.9253"Air
Exped Dura 5 Duo4.8523"Air
Exped Dura 5R4.8303"Air
Exped Dura 8R7.8333.5"Air
Exped Versa 2R2.4213"Air
Exped Versa 4R3.725.23"Air
Exped FlexMat1.512.30.7"Foam
Exped FlexMat Plus2.217.61.5"Foam
Exped MegaMat Lite"Air
Exped MegaMat 108.1603.9"SI
Exped MegaMat Max 1510.61226"SI
Exped MegaMat Max Duo 1510.62086"SI
Exped MegaMat Duo 108.11203.9"SI
Exped MegaMat Auto8.11363.9"Air
Exped DeepSleep Mat 7.58.5583"Air
Exped DeepSleep Mat Duo 7.58.51163"Air
Klymit Static V1.318.72.5"Air
Klymit Static V Insulated1.9242.5"Air
Klymit Klymaloft2.3805"Air + Foam
Klymit Static V21.3162.5"Air
Klymit Insulated Static V Lite1.9202.5"Air
Klymit Static V Lux SL1.320.83.5"Air
Klymit Double V1.3403"Air
Klymit Static V Long1.322.42.5"Air
Klymit Static V Short1.3142.5"Air
Klymit Insulated V Ultralight SL1.9162.5"Air
Kelty Mistral SI4.7441.5"SI

Sleeping Pad R-Value Standard

In 2020, the outdoor industry rolled out an international and industry-standard R-value test procedure called ASTM F3340-18. This means you can compare the R-values of different sleeping pads made by different manufacturers and know that they’re all using the same test procedure to measure the R-values of their pads. That’s a huge benefit for consumers and will eventually have the same impact that the adoption of standardized sleeping pad temperature ratings had for comparing sleeping bags from different companies.

The companies that have adopted the new R-value sleeping pad standard (ASTM F3340-18) and retested all of their current sleeping pads include:

  • Therm-a-Rest
  • NEMO
  • REI
  • Exped
  • Sea-to-Summit
  • Big Agnes
  • Klymit

What’s New in Sleeping Pads in 2022?

  • Klymit finally got around to testing most of their sleeping pads using the new ASTM 3340-18 sleeping pad R-value standard. Their pads’ new R-values are generally much lower than the previous rating they had published before the standard was adopted.
  • Exped got rid of a lot of their older sleeping pads. They still have a huge product line, but it’s a little more focused.
  • Sea-to-Summit also added a few new pads and increased the number of sizes they offer. They still offer the thickest 4″ air pads suitable for lightweight backpacking.

Status of Industry Adoption

The adoption of the new R-Value standard was driven by REI, which requires that the sleeping pads listed for sale on its main website have an ASTM F3340-18 R-Value rating.

Many sleeping pad companies have still not adopted the new ASTM F3340-18 sleeping pad R-Value standard and it’s not clear that they ever will. In fact, many manufacturers don’t test their pads at all, but “estimate” the R-values of their sleeping mats and pads. In the absence of a standard definition and test procedure,  it’s hard to tell if their estimates are accurate or whether they’re comparable to those produced by the standard ASTM F3340-18 R-value testing protocol.

See also:

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Updated September 13, 2022.


  1. I am fairly thin and sleep cold. My winter bag is the women’s Feathered Friends Murre EX, which does a pretty good job keeping me warm. However, when I switched one of my pads to the Exped Downmat XP 9, I felt positively toasty! It is totally worth the extra weight.

  2. Thank you for researching this. I sleep warm so the chart has to be shifted to notch or two for me, however the listings of some of the pads I’ve tried correlate very closely with my experience. I found the Kyymit Insulated Static V to only be good down into the mid-to-upper 20sF for me. Now I see why. It’s only R 1.9. I slept just fine in – 7F using a Therm-a-Rest NeoAir XLite Women’s (R 5. 4).

    • I have a few Klymit pads and I was pretty disappointed to see these ratings. Maybe there is something to their claim about air pockets in the folds, though. I have been pretty comfortable sleeping on snow with only polycro under the pad. I even had a good night’s sleep on the x-frame on the snow, but I was in the middle in a 3 person tent. Granted, temps probably never dropped below 20 deg. Now that it’s in my head, I’ll probably be colder.

      • There’s nothing different about the pads; they’re just compared to the competition using the same test, for a change.
        Just note, that they can’t test the R-value of the pads that have holes in them. Just falls out of the standard “tent.”

        • My assumption is that myself/spouse sleep very warm. We’ve used the Klymit Static-V Insulated pads down to around 10-15*F before feeling any cold from below. We go to 0*F by putting just a torso length (full size cut in half) Thermarest Z-lite Foam pad. Most recently on Lake Superior. They’ve been comfortable pads to sleep on.

  3. Seems to me that the weight “penalty” to go with a super warm pad people would be better served with a mid-R value pad and add in a foam pad underneath when necessary. So many options though, which is great.

  4. Now I see why the Women’s Xlite is so popular. Amazingly good insulation value from a quality brand, yet only 12 oz.

    Mine was definitely a good choice.

    • I’m a 5′ 7″ guy. The NeoAir Xlite Women’s @ $127.50 on sale is easily my best piece of gear for all the reasons we care about.

  5. I gather Gossamer Gear hasn’t tested their foam pads.

  6. The r-value testing procedure does not account for cold air at the sides of the pad, and whether that cold air cools the air inside the pad. If the sides of an inflatable pad are exposed to frigid air, you can expect it to feel less warm than it’s r-value would predict. Or, conversely, you can expect foam pads to do better in the field than you would expect, based on their r-value, relative to the inflatables. Self-inflating is a mixed bag. The important variable is how much air can mix inside the pad. A narrower pad could actually end up warmer if the pad is protected by the draped insulation of the quilt/bag. Another consideration would be to put foam on top of an inflatable.

    • Hmm true but I think the most important weakness in r value testing is air movement inside the pad. With StS pads there’s more air movement than in the Xlite. So if someone moves a lot during the night cold air from the bottom mixes with the warm one from the top. So r value is a static measure. But that’s just an opinion I’ve heard, I do’t own those pads.

      • Pointless theorizing and rumors. I find it humorous, no amazing, at the armchair theorizing that people come up with to justify their gear purchases.

      • DariusPL, agree with you. The standard R value test is in a lab with no variables such as movement. A neo air with 3 layers of reflective heat shield with an R value of 5 is the same as an Exped down filled pad with an R value of 5 with no movement.
        When you turn from side to side or whatever, the warm are stays in place with the down filled pad as opposed to the heat shield pad. So in the field, an insulated pad is more effective.
        Of course it weighs more.

    • Of course StS states quite the opposite on their site “Loss of warmth in a mat is compounded massively by air being ‘pumped around’ inside the mat when you move. In mats with large, ‘cushy’ chambers you squeeze the warm air from beneath your torso off to the extremities of the mat. Here it dissipates and you get cold. Stable, baffled constructions are much better than large tubes because they reduce the amount of air being moved. Air Sprung Cells™ are better still: press down on one cell and the amount of air which moves is very, very small. Your weight is spread over many cells which virtually eliminates internal air movement.”

    • Mordicia, also agree with you. See my lower post

    • That’s just a press release regurgitated. You can’t actually buy the new pad anywhere including from NEMO.
      You have to understand the “Gear Junkie” business model. They’re in bed with the manufacturers to create a buzz.
      I love those guys, but I discount all of their “reviews”. Too bad, they used to be credible in the old days. But as soon as you hire salespeople to sell ad inventory, it corrupts the editorial.

      I might add, I’ve had the new pad for the past few months, but haven’t reviewed it because I was respecting NEMO’s press embargo where they ask us to hold off writing about new products until they become commercially available. Either Gear Junkie ignored that or they were paid to write that article. I don’t much care. I don’t accept advertising like that – seems kind of tainted if you know what I mean. In the meantime, you can expect the old pad to go on sale at all major retailers. Good time to grab it up cheap.

  7. A cheap Z-pad hack if you are a “once a winter” camper: turn a mylar emergency blanket into a long tube with double sided tape. Slide it over your z-pad to trap air. There will be a lot of crinkling noise but it might help your kid or Scout get through their overnight winter camping trip

  8. I have both the REI FLASH 3 Season and the FLASH Thermal mattresses. They both are light, pack small and inflate with the Sea to Summit inflator/dry sack.

    BUT, REI hd a rash of FLASH mattress failures at first. I fervently hope this has been corrected by the time I got my mattresses. REI customer service assures me they will replace any mattress that fails at the weld seams.

    I do like that Sea to Summit now has tougher fabric on their air mattresses and feel StS is the leader in the insulated air mattress field. As well they have the best inflation bags and valve system, SHICH REI borrowed, to their credit.

  9. Despite sleeping cold, tucking my ee Enigma quilt below the side edges of my Uberlite–and wearing all layers–makes it comfortable to freezing in a shelter/tent. Without tucking, it’s too cold.

  10. Also, thanks for the analysis, chart, and ethics!

  11. Thank you for the detailed chart! This article was most helpful. Though I won’t pursue winter camping this year, these are golden tid bits of info that I gather for future gear, uh, “enhancements…” Please keep this article archived.

    • I refresh it every year. You can usually find it linked on the home page. I was a big advocate of standardized R-values and was in touch with many of the committee members when the standards were formulated. I think the standard makes it a lot easier to compare pads from different manufacturers and helps cut through a lot of the marketing BS that brands put out there.

  12. Why do latest thermarest xtherm and xlite pads go flat overnight? It’s a pandemic. What gives?

  13. Unless I’m reading things wrong, according to the Therm-a-rest web site the X-Lite reg and X-lite wmns weigh 12.5oz the X-Therm reg weighs 17oz and the X-Therm max reg weighs 19oz, not 12, 15 and 17 as you have above?

  14. Great info on the Exped R values/Temp Chart. With any R2 foam pad under any R4 air mattress, its cumulative R-value would seem to be almost overkill for 3 season backpacking! Saving money by using a super cheap R1 foam pad under a good air mattress seems like a good option, for those that arent cold sleepers. Thanks

  15. Since I got a sale deal both my air mattresses are REI FLASH mattresses (the 3 Season and the Thermal models). So far so good. Comfortable, easy to inflate with the compatible Sea to Summit inflator bag/dry bag which I also use for storing clothes.

    For winter I use a 1/16″ thick closed cell pad cut from floor underlayment for very cold temps. Seems to work ar -20F. with the FLASH Thermal pad and an LL Bean -20 F. down mummy bag. (One of the best winter bags I’ve ever seen.)

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