Sleeping Pad R Values

Sleeping Pad R Values

A Sleeping Pad R-Value measures a sleeping pad’s ability to prevent 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.

R-Value Recommendations

  • For winter backpacking and camping, an R-value of 5, or higher, is recommended.
  • For three-season backpacking and camping, an R-value of 2, or higher,  is recommended.
  • R-values are additive, so you can combine two pads to increase your warmth level.
  • 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

For purposes of backpacking and camping, you also need to factor in weight, comfort, compressibility, and rigidity when you make a sleeping pad selection.

Sleeping Pad R-Value Standard

In 2020, the outdoor industry is rolling out an international and industry-standard R-value test procedure called ASTM3340-18. This means you’ll be able to 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.

Sleeping Pad R-Value Comparison

The following table provides a side by side comparison of the major 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 (coming soon). The R-Value of a pad should remain the same if you select a longer, shorter, or wider variation of the pad. If a sleeping pad has a R-Value of “NA”, it’s because the manufacturer has not supplied one or R-value testing has not been performed.

Some sleeping pad manufacturers, most notably Klymit, have not yet published new 2020 R-values that are compliant with the new sleeping pad R-value standard. Their old R-values are included in the table below for historical reasons but are marked with an asterisk *
Make / Model2020 R-ValueWeight (Oz)ThicknessType
Therm-a-Rest NeoAir XLite4.2122.5"Inflatable
Therm-a-Rest NeoAir XLite Women's5.4122.5"Inflatable
Therm-a-Rest NeoAir XTherm6.9152.5"Inflatable
Therm-a-Rest NeoAir XTherm Max6.9172.5"Inflatable
Therm-a-Rest NeoAir UberLite2.38.82.5"Inflatable
Therm-a-Rest Basecamp6402"Inflatable
Therm-a-Rest LuxuryMap6523"Inflatable
Therm-a-Rest MondoKing 3D7704.25"Inflatable
Therm-a-Rest NeoAir Camper Duo2.5733"Inflatable
Therm-a-Rest NeoAir Venture2.2192"Inflatable
Therm-a-Rest Original Z Lite1.7140.75"Foam
Therm-a-Rest ProLite2.4181"Self-Inflating
Therm-a-Rest ProLite Apex3.8222"Self-Inflating
Therm-a-Rest ProLite Plus3.2231.5"Self-Inflating
Therm-a-Rest ProLite Plus Women's3.9221.5"Self-Inflating
Therm-a-Rest ProLite Women's2.7181"Self-Inflating
Therm-a-Rest Ridegrest Classic2140.625"Foam
Therm-a-Rest RidgeRest SOLite2.1140.625"Foam
Therm-a-Rest NeoAir Topo2.3233"Inflatable
Therm-a-Rest NeoAir Topo Luxe3.7234"Inflatable
Therm-a-Rest Trail Lite3.2261.5"Self-Inflating
Therm-a-Rest Trail Lite Women's4.5251.5"Self-Inflating
Therm-a-Rest Trail Pro4.4293"Self-Inflating
Therm-a-Rest Trail Scout3.1221"Self-Inflating
Therm-a-Rest Z Lite Sol2140.75"Foam
Sea-to-Summit Ether Light XT Insulated Air3.217.34"Inflatable
Sea-to-Summit Ether Light XT Insulated Air Women's3.517.54"Inflatable
Sea-to-Summit Ultralight Insulated Air Women's3.515.82"Inflatable
Sea-to-Summit Ultralight Insulated Air3.116.92"Inflatable
Sea-to-Summit Comfort Light Insulated Women's3.823.52"Inflatable
Sea-to-Summit Comfort Light Insulated Air3.721.92"Inflatable
REI Trekker5.6401.75"Self-Inflating
REI Trekker Women's4.2301.75"Self-Inflating
REI Flash Thermal4.7192"Inflatable
REI Flash 3-Season3.2162"Inflatable
REI AirRail Plus3.3251.5"Self-Inflating
REI Air Rail Plus Women's3.7251.5"Self-Inflating
REI Stratus Insulated2.9212.5"Inflatable
REI Kingdom3.5412.75"Inflatable
REI Groundbreaker5451.5"Self-Inflating
REI Kindercamper2.5191"Self-Inflating
REI Camp Dreamerr2.7544"Inflatable
NEMO Switchback UL214.50.9"Foam
NEMO Tensor Alpine UL4.8173"Inflatable
NEMO Tensor UL Insulated3.5143"Inflatable
NEMO Tensor UL Non-insulated1.6133"Inflatable
NEMO Cosmo 3D3.3323.5"Inflatable
NEMO Roamer SI6634"Self-Inflating
NEMO Nomad CampingNA486'Inflatable
NEMO Vector UL Non-insulated1.6223"Inflatable
NEMO Vector UL Insulated3.5253"Inflatable
NEMO Astro Insulated2.6243.5"Inflatable
NEMO Astro Non-Insulated1.5193.5"Inflatable
NEMO Astro Lite Insulated2.6183.5"Inflatable
NEMO Astro Lite Non-Insulated1.5143.5"Inflatable
NEMO Flyer3.3232"Inflatable
Exped FlexMat1.510.60.7"Foam
Exped FlexMat Plus2.217.61.5"Foam
Exped DownMat XP 97.831.23.5"Inflatable
Exped DownMat UL Winter7.122.23.5"Inflatable
Exped SynMat UL Winter5.2213.5"Inflatable
Exped SynMat HL Duo Winter5372.8"Inflatable
Exped SynMat UL2.914.32.8"Inflatable
Exped SynMat HL2.912.92.8"Inflatable
Exped SynMat HL Duo2.929.32.8"Inflatable
Exped SynMat UL Lite2.313.42"Inflatable
Exped AirMat UL Lite1.312.32"Inflatable
Exped AirMat HL1.310.92.8"Inflatable
Exped SIM UL"Self-Inflating
Exped DownMat XP 75.828.42.8"Inflatable
Exped SynMat"Inflatable
Exped SynMat XP"Inflatable
Exped SynMat XP 74.8282.8"Inflatable
Exped SynMat Duo4.849.42.8"Inflatable
Exped DownMat Lite 53.821.92"Inflatable
Exped SynMat Lite 53.422.22"Inflatable
Exped AirMat Lite 51.318.52"Inflatable
Exped AirMat Lite Plus 51.319.82"Inflatable
Exped SIM 3.84.630.71.5"Self-Inflating
Exped SIM 56.1362"Self-Inflating
Exped SIM Lite"Self-Inflating
Exped SIM Comfort 54.330.52"Self-Inflating
Exped SIM Comfort Duo 54.381.12"Self-Inflating
Exped SIM Comfort 7.56.464.23"Self-Inflating
Exped SIM Comfort Duo 7.56.4117.13"Self-Inflating
Exped SIM Comfort"Self-Inflating
Exped MegaMat 108.1603.9"Self-Inflating
Exped MegaMat Max 1510.61226"Self-Inflating
Exped MegaMat Max Duo 1510.62086"Self-Inflating
Exped MegaMat Duo 108.11203.9"Self-Inflating
Exped DeepSleep Mat 7.58.5583"Inflatable
Exped DeepSleep Mat Duo 7.58.51163"Inflatable
Exped MultiMat Uno1.410.1.1"Foam
Big Agnes Insulated Q-Core SLX3.2183.5"Inflatable
Big Agnes Insulated Q Core Deluxe4.3253.5"Inflatable
Big Agnes Insulated AXL Air3143.25"Inflatable
Big Agnes Insulated AXL Trail Boss4.4403.25"Inflatable
Big Agnes Insulated Air Core Ultra4.5223.25"Inflatable
Big Agnes Air Core Ultra1.4183.25"Inflatable
Big Agnes Insulated SLX Tent Floor3.2433.5"Inflatable
Big Agnes Third Degree Foam1.5120.5"Foam
Big Agnes Hinman5341.5"Self-Inflating
Big Agnes Two Track3.3212"Self-Inflating
Klymit Static V1.3*162.5"Inflatable
Klymit Static V21.3*162.5"Inflatable
Klymit Insulated Static V4.4*245"Inflatable
Klymit Insulated Static V Lite4.4*242.5"Inflatable
Klymit Insulated Static V Luxe5*323"Inflatable
Klymit Static V Luxe1.6*27.23"Inflatable
Klymit Insulated Static V Luxe SLNA313.5"Inflatable
Klymit Static V Luxe SL1.5*20.83.5"Inflatable
Klymit Insulated V Ultralite SL4.4*162.5"Inflatable
Klymit Double V1.6*403"Inflatable
Klymit Static V LongNA22.42.5"Inflatable
Klymit Insulated Hammock VNA362.5"Inflatable
Klymit Hammock VNA28.82.5"Inflatable
Klymit Insulated Double V4.4*52.83"Inflatable
Klymit Static V Short1.3*142.5"Inflatable
Klymit V Ultralite SLNA11.92"Inflatable
Klymit Inertia OzoneNA131.75"Inflatable
Klymit Inertia X-FrameNA9.21.5"Inflatable
Klymit Inertia XLNA14.81.5"Inflatable
Klymit Inertia X LiteNA5.21.5"Inflatable
Klymit Armoured V1.6*38.42.5'Inflatable
Klymit Static V Pink CamoNA18.72.5"Inflatable
Mountain Equipment Aerostat Down 7.0519.42.8"Inflatable

Old R-Values vs. New Standardized R-Values

This table lists the old R-values that manufacturers assigned their sleeping pads before the passage of the new ASTM3340-18 standard and compares them to their new standardized R-values, which have been tested using the same test methodology and apparatus.

Make / ModelOld R Value2020 R-Value
Therm-a-Rest NeoAir XLite3.24.2
Therm-a-Rest NeoAir XLite Women's3.95.4
Therm-a-Rest NeoAir XTherm5.76.9
Therm-a-Rest NeoAir XTherm Max5.76.9
Therm-a-Rest NeoAir UberLite22.3
Therm-a-Rest Basecamp5.86
Therm-a-Rest LuxuryMap6.86
Therm-a-Rest MondoKing 3D11.47
Therm-a-Rest NeoAir Camper Duo2.22.5
Therm-a-Rest NeoAir Venture1.92.2
Therm-a-Rest Original Z LiteNew1.7
Therm-a-Rest ProLite2.42.4
Therm-a-Rest ProLite Apex43.8
Therm-a-Rest ProLite Plus3.43.2
Therm-a-Rest ProLite Plus Women's4.23.9
Therm-a-Rest ProLite Women's32.7
Therm-a-Rest Ridegrest Classic2.62
Therm-a-Rest RidgeRest SOLite2.82.1
Therm-a-Rest NeoAir TopoNew2.3
Therm-a-Rest NeoAir Topo LuxeNew3.7
Therm-a-Rest Trail Lite3.43.2
Therm-a-Rest Trail Lite Women's44.5
Therm-a-Rest Trail Pro44.4
Therm-a-Rest Trail Scout4.83.1
Therm-a-Rest Z Lite Sol2.62
Sea-to-Summit Ether Light XT Insulated Air3.83.2
Sea-to-Summit Ether Light XT Insulated Air Women's4.23.5
Sea-to-Summit Ultralight Insulated Air Women's3.83.5
Sea-to-Summit Ultralight Insulated AirNA3.1
Sea-to-Summit Comfort Light Insulated Women'sNA3.8
Sea-to-Summit Comfort Light Insulated Air4.23.7
REI TrekkerNA5.6
REI Trekker Women'sNA4.2
REI Flash ThermalNew4.7
REI Flash 3-SeasonNew3.2
REI AirRail PlusNA3.3
REI Air Rail Plus Women'sNA3.7
REI Stratus InsulatedNA2.9
REI KingdomNew3.5
REI GroundbreakerNew5
REI KindercamperNew2.5
REI Camp DreamerrNew2.7
NEMO Switchback ULNA2
NEMO Tensor Alpine ULNA4.8
NEMO Tensor UL InsulatedNA3.5
NEMO Tensor UL Non-insulatedNA1.6
NEMO Cosmo 3DNA3.3
NEMO Nomad CampingNANA
NEMO Vector UL Non-insulatedNA1.6
NEMO Vector UL InsulatedNA3.5
NEMO Astro InsulatedNA2.6
NEMO Astro Non-InsulatedNA1.5
NEMO Astro Lite InsulatedNA2.6
NEMO Astro Lite Non-InsulatedNA1.5
NEMO FlyerNA3.3
Exped FlexMatNew1.5
Exped FlexMat PlusNew2.2
Exped DownMat XP 987.8
Exped DownMat UL Winter77.1
Exped SynMat UL Winter55.2
Exped SynMat HL Duo Winter55
Exped SynMat UL3.32.9
Exped SynMat HL3.32.9
Exped SynMat HL Duo3.32.9
Exped SynMat UL Lite2.52.3
Exped AirMat UL Lite1.71.3
Exped AirMat HL1.91.3
Exped SIM UL
Exped DownMat XP 75.95.8
Exped SynMat 965.2
Exped SynMat XP 965.2
Exped SynMat XP 74.94.8
Exped SynMat Duo4.94.8
Exped DownMat Lite 54.13.8
Exped SynMat Lite 52.53.4
Exped AirMat Lite 51.71.3
Exped AirMat Lite Plus 51.71.3
Exped SIM 3.844.6
Exped SIM 54.66.1
Exped SIM Lite
Exped SIM Comfort 54.64.3
Exped SIM Comfort Duo 54.64.3
Exped SIM Comfort
Exped SIM Comfort Duo
Exped SIM Comfort 109.58.1
Exped MegaMat 109.58.1
Exped MegaMat Max 15New10.6
Exped MegaMat Max Duo 15New10.6
Exped MegaMat Duo 109.58.1
Exped DeepSleep Mat 7.5New8.5
Exped DeepSleep Mat Duo 7.5New8.5
Exped MultiMat Uno1.41.4
Big Agnes Insulated Q-Core SLXNA3.2
Big Agnes Insulated Q Core DeluxeNA4.3
Big Agnes Insulated AXL AirNA3
Big Agnes Insulated AXL Trail BossNA4.4
Big Agnes Insulated Air Core UltraNA4.5
Big Agnes Air Core UltraNA1.4
Big Agnes Insulated SLX Tent FloorNA3.2
Big Agnes Third Degree FoamNA1.5
Big Agnes HinmanNA5
Big Agnes Two TrackNA3.3
Klymit Static V1.3NA
Klymit Static V21.3NA
Klymit Insulated Static V4.4NA
Klymit Insulated Static V Lite4.4NA
Klymit Insulated Static V Luxe5NA
Klymit Static V Luxe1.6NA
Klymit Insulated Static V Luxe SLNANA
Klymit Static V Luxe SL1.5NA
Klymit Insulated V Ultralite SL4.4NA
Klymit Double V1.6NA
Klymit Static V LongNANA
Klymit Insulated Hammock VNANA
Klymit Hammock VNANA
Klymit Insulated Double V4.4NA
Klymit Static V Short1.3NA
Klymit V Ultralite SLNANA
Klymit Inertia OzoneNANA
Klymit Inertia X-FrameNANA
Klymit Inertia XLNANA
Klymit Inertia X LiteNANA
Klymit Armoured V1.6NA
Klymit Static V Pink CamoNANA
Mountain Equipment Aerostat Down 7.0NA5

Updated February 22, 2020

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  1. Fantastic job! Immensely helpful to pad shoppers.

    • What she said!
      I’ve compiled a quick graph of the available values and the items with good R values with least weight (upper left limits of the graph) really stand out. Of course i didn’t put in price as a factor… that could change things for sure.

  2. Can you do the same with Eastern Mountain Sports’ pads. Back in the day, EMS had a firm hold on the Northeast and mid-Atlantic states and a large inventory of EMS-designed gear. I am sure there are readers with EMS gear in their gear rooms/cabinets/closets. Thanx in advance.

    • There’s really no point. EMS only sells 3 branded pads on their website and while they list R-values, I have no reason to believe they ever did any testing or that they have adopted the new R-value standard. They primarily resell the pads listed above. I also can’t account for their historic gear.

      I’ll reach out and ask but I doubt anyone at EMS knows the answer. Everyone I know who ever worked there quit years ago and I’m surprised that they’re even still in business. Hate to be so negative, but the private equity firm that bought EMS a few years ago drove it into the ground. The only people who shop there in North Conway are people from out of town who don’t know any better.

      • Phil;
        Don’t get me started! As an EMS alumni (Store 168) I have watched the original owners almost chain our doors closed; the Vista or whatever extort stores by forcing us to sell former TJ Maxx Timberline boots (yep, tags still on them, and Meridan wanted us to sell them $40 more!) so we could pay for employees on staff, and then the UK-ers with their cheap knockoff “K” brand.
        Remember when we would go to a store for hours, and talk with “Guides” (Sales Associates) who knew their product and actually used it. The Shoe Gurus were trained to speak the strengths and weaknesses of boots, socks and inserts. The bike techs could actually build a bike and the Thule rack builders went to the school in Seymour? We hosted great outreach clinics that also made us aware of local craft beer! Now the guides are transfers from Bob’s stores.
        Not anymore. I only wish REI would fill-in the vacuum created by closed EMS and Denali stores (there is another heartbreak!), so we in CT didn’t have to drive so far. I am so glad my military affiliation allows me to purchase through Experticity.
        Thanks for all you do. Well written articles and honest evaluations. I turn all my college students on to your site to help them with initial purchases. And to understand I’m not the only “old school gear nut”!

      • Gee Phil, a little ruff there. But you’re right, not the same EMS I bought my first pack from – a box sale back in ‘72 on Comm Ave – an orphaned Kelty frame that I married to a 4900 cu in EMS bottomless pit. And my first, never-to-ever break-in Raichle boots.
        The Comm Ave store was always a stop on the way to the whites, even on a nothing better to do Friday night.
        I was low budget back then though – a lot of army surplus stuff, and Campmor, but it did the trick.
        Sorry to see their demise.
        REI now occupies their old building, and has many familiar faces.
        And I finally replaced my pack!

  3. Very helpful list. Just came across the Downmat HL which is missing from this list, but compares very favorably.

  4. There are also non-insulated version of the S2S Ether Light that aren’t on here.

    • Adriana Sabella

      thanks for publishing the old vs new r values!!!

      • Hello.

        I have a ThermaRest pad that I can’t seem to identify.

        It’s similar to a large Basecamp, however, the color is black or dark gray, and the ratings a little different.

        Loft 2.5/ R-Value 7 and it’s called an LE. Maybe it was an older version or a special edition??

      • I suggest you contact the manufacturer for more information.

  5. This is very helpful and interesting!!! THANK YOU

  6. Phil,

    Klymit has been sending out insulated pads with this printed on the label:

    4.4 R-Value (1.9 ASTM F3340-18 )

    Any idea what this means?

    • If I had to hazard a guess, I suspect it means that the pad’s R-value as measured using the new ASTM 3340-18 is 1.9 and the pre-standard R-value they estimated was 4.4. Of course, publishing both those numbers seems kind of stupid since they’re both so different.

      I checked their website and saw one pad with a new ASTM R-value but the other ones haven’t been updated. Let me reach out to them and see if they’ve been testing their pads using the new standard. They were supposed to get in touch with me when they did.

      Can you tell me which pad model you have that has that printed on it?

      • Thanks, Phil, it’s the Insulated V Ultralight SL.

      • Just sent them an email. I’ll update this thread when I hear back so others can benefit from the beta as well.

      • Klymit’s response.

        Klymit is testing older sleeping pads and new releases. In an effort to conform to the new ASTM industry standard while not confusing the current Klymit customer base, Klymit is listing both historical R-values and ASTM R-values on our website and packaging. ASTM R-values will be listed once the pad has been tested. You are correct that 4.4 is the pad’s original R-Value and 1.9 is the ASTM R-value. In over the eight years Klymit has offered insulated pads, there has never been a change in the insulation.

        The problem they face is that the new standard assumes a flat pad pressed between two plates. Klymit’s air channels perform poorly on this test.

  7. If 1.9 is the tested R-value and 4.4 is the previously claimed value, that may explain my experience testing that pad in the back yard on a 13F night. I was very cold with that pad and switched to another that had about the same claimed R-value and was warm. The pad I switched to had an accurate R-value.

  8. I have a Klymit Insulated Static V Luxe that is probably three years old. When used on a mid-20F night with a 20F sleeping bag (FF Penguin) and not using particularly warm sleepwear, I was toasty warm. But when used with a quilt, I was cold. I suspect the difference is from the “valleys” of the Vs being uninsulated. Still, it is astounding, may be disappointing, that even now Klymit has not updated either their tests or their insulation.

    • I generally sleep warm and the purpose of my backyard expedition was to test the limits of my 30F sleeping bag while wearing all my layers. I was surprised when the cold was coming from below. My opinion is that the Klymit Insulated Static V Luxe is good to the mid-20sF with a sleeping bag. It goes into my loaner gear for temps 25F and above. I don’t think it would be comfy below 20 even with a sleeping bag, and 13F was definitely out of its league, although I was fine when I switched to a NeoAir XLite.

      I did discover a real world flaw in thinking that my 30F bag would keep me warm down to 13F. That only works if I have dry layers. On an AT section hike after a brutal day that featured rain, freezing rain, and then snow accompanied by high winds that continued for most of the night, my hiking clothes were soaked. I did have a dry sleep layer to change into, but it was only a base layer. Everything else was hung in the shelter to dry. The temp didn’t get below 20F but long johns and a puffy just didn’t cut it in the howling wind and snow. My buddy Larry loaned me his down puffy since he had a zero bag and that extra puffy got me through. I’ve got to rethink my system, which probably means bringing my half pound heavier 20F bag on long section hikes in shoulder seasons.

  9. Thanks for checking that out , Phil. Your analysis makes a lot of sense. I have an older model, the Insulated Static V Lite, that I’ve used successfully with a down bag on snow with temperatures in the mid-twenties. The insulation at the bottom of my bag probably filled up the channels beneath me and provided enough thermal resistance for a comfortable night.

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