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Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad

4.5 4.5 out of 5 stars 761 ratings
Price: $234.99 $239.95 Free Returns on some sizes and colors

Original Storage Bag
Size Large - 77 x 25 Inches
Special Feature Portable, Quick Deflation, Quick Inflation
Brand Therm-a-Rest
Color Lyons Blue
Product Dimensions 77"L x 25"W x 4"Th
Specific Uses For Product Sleeping Pad
Included Components Sleeping Pad, Pump Sack, Storage Sack
Target Audience Adult
Model Name MondoKing 3D
Capacity 1440 Pounds
Material
Polyester
Item Weight
1.99 Kilograms
Weight Limit
1440 Pounds
Water Resistance Level
Water Resistant

About this item

  • Camp like royalty with the MondoKing 3D, an ultra-comfy 4.25-inch thick sleeping pad with a stretch knit fabric layer for resting better under the stars
  • Utilizing two one-way valves, one for inflation and one for deflation, the TwinLock valve system makes setting up and breaking camp a breeze
  • 7.0 R-value insulates in the most extreme conditions using StrataCore construction that utilizes a continuous layer of thermal foam nestled between alternating ridges of air and foam
  • 3D construction creates vertical sidewalls to maximize useable sleep surface and comfort
  • StrataCore construction allows the pad to easily compress and pack away to a compact 26x10.3 inches in included storage sack
  • For best performance, inflate your self-inflating pad with air by breath or included pump sack and leave the mattress fully inflated for 2-4 hours before your first use.
  • Large size measures 77x25x4.25 inches, 26x10.3 inches rolled, and weighs 4.38 pounds; stuff sack/pump sack included; limited lifetime warranty; made in the USA
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Top Brand: Therm-a-Rest

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  2. Therm-a-Rest Logo

    In 1971, a mix of unemployed Boeing engineers, a leaky foam gardening pad, and the dream of better nights under the stars came together to change how we experience the outdoors forever.

    By 1972, Cascade Designs was formed and began selling the Therm-a-Rest Standard 3/4 – the world’s first self-inflating sleeping pad.

    The rest, as they say, is history.

  3. Person using a press to test a sleeping pad

  4. BIG IDEAS. SMALL FOOTPRINT.

    We are committed to providing you with the best possible solutions in outdoor comfort and keeping a vigilant eye on our environmental footprint while we do it. From smaller things, like repurposing die-cut foams to make our Compressible Pillows, to a broad, global awareness of our supply chain’s impact.

    One of our longest-standing initiatives has been a commitment to making our products “In Market”. This initiative has enabled us to greatly reduce the length and complication of our supply chain, resulting in better service and a smaller global footprint.

  5. Man inflating a sleeping pad
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From the manufacturer

MondoKing Header
MondoKing Features
Why MondoKing
Made in the USA
MondoKing 3D Sleeping pad LuxuryMap BaseCamp
MondoKing 3D LuxuryMap BaseCamp
Customer Reviews
4.5 out of 5 stars
761
4.6 out of 5 stars
340
4.6 out of 5 stars
914
Price $239.95 $209.95 $134.95
R-Value 7.0 6.0 6.0
Thickness 4.25 Inches 3 Inches 2 Inches
Weight (Size Regular) 4 lbs 6 oz 3 lbs 4 oz 2 lbs 8 oz
Packed Size (Size Regular) 26 x 10.3 in 21 x 9.5 in 21 x 8.5 in
Top Fabric Type 50D Polyester Stretch Knit 50D Polyester Knit 75D Polyester Knit
Self-Inflating ✓ ✓ ✓
Pressure-Mapping ✓
Made in the USA ✓ ✓ ✓
Repair Kit Included ✓ ✓ ✓
Multiple Sizes ✓ ✓ ✓

Product Description

Sleep like camp royalty with the ultra luxurious Therm-a-Rest MondoKing 3D Self-Inflating Foam Camping Mattress. With couples in mind, the pad can be paired with a second MondoKing for a double sleeping pad. The pad offers an R-value of 8.0 for maximum year-round comfort thanks to thick thermal foam and StrataCore construction, which uses a continuous layer of thermal foam nestled between alternating ridges of air and foam (R-value measures the material’s ability to insulate; the higher the R-value, the warmer the sleeping pad). Perfect for car camping, expedition basecamps, RVs, and boats, it also makes an excellent guest bed at home. The stable mattress offers maximum stability, cushioning, and protection from rocks, roots, and uneven ground surfaces. All styles have dual valves that allow compressible foam core to expand and inflate when unpacked, and all styles mate perfectly with other Therm-a-Rest MondoKing mattresses with a similar style. Available in three styles: Equipped with the Standard Valve with the 2018 or 2019 model, or equipped with the TwinLock Valve the sleeping pad has dedicated "in" and "out" valves to make inflating and deflating the pad easier than ever. Standard Valve models are 4.0 inches thick inflated and include a stuff sack, and TwinLock Valve models are 4.5 inches thick inflated and include a stuff sack that can also be used as a pump sack (for easier, breath-free pad inflation). Made in the USA. Manufacturer’s limited lifetime warranty.

Product information

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Customer reviews

4.5 out of 5 stars
761 global ratings

Customers say

Customers like the comfort and build quality of the air mattress. They mention it's super comfortable, reduces back pain, and is well-made. Customers also appreciate its appearance, insulation, and functionality. However, some customers have mixed opinions on air retention, value for money, and size.

AI-generated from the text of customer reviews

Select to learn more
ComfortBuild qualityAppearanceInsulationFunctionalityAir retentionValue for moneySize
64 customers mention "Comfort"60 positive4 negative

Customers are satisfied with the comfort of the air mattress. They mention it's soft, thicker, and for a side sleeper it works well. Some say they no longer have a sore back while camping and that three of the pads fit good in a 10x10 tent.

"...😂 Easily the best camping air mattress I've ever used. It felt like sleeping in my own bed, because of the foam, it's great...." Read more

"This had a reputation of being very comfortable, and I agree. I have it on a cot in a back room of my apartment...." Read more

"...fan, but for my application, this worked perfectly, is super comfortable, but you WILL need to buy a small battery powered inflator, the bag they..." Read more

"...The larger size means plenty of room, and it is comfortable...." Read more

17 customers mention "Build quality"13 positive4 negative

Customers like the build quality of the air mattress. They mention it's well-made, has thick material, and is comfortable. Some say the price is high, but the quality seems worth it.

"...👍 It seems well built and can support my fat butt so I recon it will yours too, and be comfy. 🥰..." Read more

"...The larger size means plenty of room, and it is comfortable. Seems very durable too, unlike the standard air mattress I used before that got..." Read more

"Bigger guy review (6'2" 275lb). PROS: Mattress is well made, seems like it will hold up with some care to avoid puncture...." Read more

"...This is a MAJOR design fault. It costs shipping charges back to therm-a-rest and $20 to repair the leak with no guarantee the leak will be fixed...." Read more

12 customers mention "Appearance"12 positive0 negative

Customers like the appearance of the air mattress. They mention it's an excellent mattress, looks nice, and the nylon carry bag is nice.

"...Another annoying, cheap tactic. The nylon carry bag is nice, the one that arrived knotted, with the rolled up mattress inside." Read more

"...If you don't need to hike your gear in, this is a fantastic option for an amazing night sleep." Read more

"...It is really nice, and find myself very lucky to get earlier. But not sure if that $ nice, now. I would look around first, or if price drops." Read more

"Pretty dang comfortable and kept me warm. One of the better sleeping pads I’ve owned" Read more

12 customers mention "Insulation"12 positive0 negative

Customers like the insulation of the air mattress. They mention it keeps them warm in cold weather and is great for camping in cold weather.

"...Since it is well insulated it keeps you warm in colder weather. The larger size means plenty of room, and it is comfortable...." Read more

"...Mattress stayed warm throughout the nights. Bag cinches closed and has a carrying strap. CONS: Comfort was lacking for me...." Read more

"...I added more air and WOW! It not only helps to keep your body heat from being sucked out, but the comfort is unreal...." Read more

"Pretty dang comfortable and kept me warm. One of the better sleeping pads I’ve owned" Read more

9 customers mention "Functionality"9 positive0 negative

Customers are satisfied with the functionality of the air mattress. They mention it works well, is easy to inflate without any gadgets, and is perfect for any use. The check valves for inflation and deflation work perfectly.

"...else, I'm NOT a thermarest fan, but for my application, this worked perfectly, is super comfortable, but you WILL need to buy a small battery..." Read more

"...n't used in the wild yet, however set it up in my living room and it works great and is very comfortable." Read more

"...Easy to deflate and store. Check valves for inflation/deflation worked perfectly and allowed for easy modulation of the firmness...." Read more

"Have used this for 3 camping trips so far and it has worked very well. However, if you move a lot during sleep, it may lose a bit of air...." Read more

47 customers mention "Air retention"19 positive28 negative

Customers have mixed opinions about the air retention of the air mattress. Some mention it inflates easily, stays inflated, and deflates simple. However, others say it doesn't self-inflate and the seams suddenly detached, creating a huge air bubble in the middle of the sleeping area.

"...This makes it very difficult to fully inflate. Also, if you put light pressure on the pad with your hand, you can hear the air coming out...." Read more

"...It will basically self inflate, but the bag it's stored in can be used as a pump, which is neat, but I bought the tiny pump for it...." Read more

"...Unfortunately it didn’t self inflate and I didn’t want to blow it up with lung power...." Read more

"...Deflating is much easier with an inflater, you can suck most of the air out of it that way...." Read more

24 customers mention "Value for money"12 positive12 negative

Customers have mixed opinions about the value of the air mattress. Some mention it's worth the money, while others say it's overpriced and doesn't last.

"No longer have a sore back while camping. Worth every penny!" Read more

"...I like it, but it's way overpriced, and I tired of looking for a solution to my problem, this solved it...." Read more

"...I could actually walk when I got out of my tent. Its pricey, but worth the money. Are you going backpacking with it?..." Read more

"...Makes a difference. The mattress pad is high priced for what it is but I think it will perform fine. I was impressed that it self inflated to 90%...." Read more

19 customers mention "Size"9 positive10 negative

Customers have mixed opinions about the size of the air mattress. Some mention it's easy to deflate and fits in half of the rear cargo area, while others say it's too large when compressed for backpacking.

"...It fits in half of the rear cargo area, with will work with some tricks & adjustments for my height (6 ft.)...." Read more

"...Probably a mistake on my part but would handle with care. Only fits one person, unless you lay on top of each other...." Read more

"...The larger size means plenty of room, and it is comfortable...." Read more

"...Cons:Too large when compressed for backpacking.Needs to remain uncompressed for long term storage.All in all… buy this thing...." Read more

Slight modification needed
4 out of 5 stars
Slight modification needed
I’m 6’4”, 280 lbs and prefer to sleep on my side. $30 mattress weren’t cutting it when camping with my family. I was excited about finding the highly reviewed Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad, so I bought the XXL 80x30 inch model. Unfortunately it didn’t self inflate and I didn’t want to blow it up with lung power. So I bought a Diswasher Disposer (7/8 to 5/8 connector) that perfectly attached a bellow foot pump to the mattress’ “IN” valve. Looking forward to the first night of sleeping on it.
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Top reviews from the United States

Raijiin
5.0 out of 5 stars Best camping sleep for the money.
Reviewed in the United States on September 6, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
The only thing I dislike about this, is that it didn't exist sooner. 😂 Easily the best camping air mattress I've ever used. It felt like sleeping in my own bed, because of the foam, it's great. I slept well, all night, on the ground, in the woods. No tossing and turning, and I felt rested in the morning. It's not loud or makes weird noises when you move around on it, and it feels soft to the touch instead of plastic or something. It will basically self inflate, but the bag it's stored in can be used as a pump, which is neat, but I bought the tiny pump for it. Inflates in under 10 minutes I think. It's a bit bulky, not for backpacking but if your worried about your back and want to camp, use this mattress, my 75yo dad approves. 👍 It seems well built and can support my fat butt so I recon it will yours too, and be comfy. 🥰
2 people found this helpful
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j higbee
5.0 out of 5 stars Comfortable
Reviewed in the United States on September 3, 2024
Size: Large - 77 x 25 InchesStyle: Original Storage BagVerified Purchase
This had a reputation of being very comfortable, and I agree. I have it on a cot in a back room of my apartment. I've slept on it a few times, and find it almost as comfortable as my bed. I sometimes travel cross-country on adventures, and sleep in the back of my car, a Subaru Outback. I haven't tried it in the car yet, but I'm sure it will be more comfortable than things I've used in the past! It fits in half of the rear cargo area, with will work with some tricks & adjustments for my height (6 ft.). It could easily be moved from my car to a tent.

One trick to consider. don't overfill it. I found it much more comfortable after I took a bit of air out of it.
3 people found this helpful
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Dan
5.0 out of 5 stars “IN” valve is not one-way, as stated in instructions
Reviewed in the United States on July 19, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
*** Update - ThermaRest got back to me and sent two replacements. The valves on the new pads work properly.

The INFLATION section of the TwinLock Valve Instructions states that “The one-way IN valve will prevent air from escaping”. This is not true. While inflating with the pump sack, when you get above approximately 50 % inflation, every time you pump air in, you can hear it come right back out after you stop pumping. This makes it very difficult to fully inflate. Also, if you put light pressure on the pad with your hand, you can hear the air coming out. I have two pads that I bought at the same time and both have the same issue.

I emailed ThermaRest 9 days ago with this issue to see what they’d say, but I still haven’t heard back from them.
2 people found this helpful
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4pierre
5.0 out of 5 stars Comfy!
Reviewed in the United States on September 7, 2024
Size: Large - 77 x 25 InchesStyle: Original Storage BagVerified Purchase
Car camping only. I'm a side sleeper and this is great! Have been camping for years and as I've gotten older it's been harder to get a good rest on the thinner backpacking models I have used the past 25+ years
2 people found this helpful
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Marshall Nichols
5.0 out of 5 stars Expensive, but nice
Reviewed in the United States on February 20, 2023
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
I almost didn't buy this, tried everything else, I'm NOT a thermarest fan, but for my application, this worked perfectly, is super comfortable, but you WILL need to buy a small battery powered inflator, the bag they give you is supposed to be a pump, but it'll take an hour to inflate using that. Deflating is much easier with an inflater, you can suck most of the air out of it that way. I like it, but it's way overpriced, and I tired of looking for a solution to my problem, this solved it. Now let's see how long before it gets a hole in it, which is my problem with every other thermarest product.
8 people found this helpful
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Duck Hunter
4.0 out of 5 stars Slight modification needed
Reviewed in the United States on August 21, 2023
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
I’m 6’4”, 280 lbs and prefer to sleep on my side. $30 mattress weren’t cutting it when camping with my family. I was excited about finding the highly reviewed Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad, so I bought the XXL 80x30 inch model. Unfortunately it didn’t self inflate and I didn’t want to blow it up with lung power. So I bought a Diswasher Disposer (7/8 to 5/8 connector) that perfectly attached a bellow foot pump to the mattress’ “IN” valve. Looking forward to the first night of sleeping on it.
Customer image
Duck Hunter
4.0 out of 5 stars Slight modification needed
Reviewed in the United States on August 21, 2023
I’m 6’4”, 280 lbs and prefer to sleep on my side. $30 mattress weren’t cutting it when camping with my family. I was excited about finding the highly reviewed Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad, so I bought the XXL 80x30 inch model. Unfortunately it didn’t self inflate and I didn’t want to blow it up with lung power. So I bought a Diswasher Disposer (7/8 to 5/8 connector) that perfectly attached a bellow foot pump to the mattress’ “IN” valve. Looking forward to the first night of sleeping on it.
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14 people found this helpful
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Brent
5.0 out of 5 stars Perfect Car Camping Mattress
Reviewed in the United States on June 1, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
I have used this mattresses a couple of times, and it is now my favorite one for car camping. Since it is well insulated it keeps you warm in colder weather. The larger size means plenty of room, and it is comfortable. Seems very durable too, unlike the standard air mattress I used before that got multiple holes in it when the plastic got old after a few years. The Thermarests seem to last forever.
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Hallucinati
1.0 out of 5 stars Does Not Self Inflate At All
Reviewed in the United States on September 4, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
Just got it today. Took it out to inspect it and to see if it looked tough enough to hold up. All excited, I unscrew the "In" plug and--nothing. It still has the vacuum-wrinkled corners. I know the plug is open and functional because I could blow into it quite easily.

The reason I bought this thing is for the self-inflation. I know the last bit always takes a few pumps of the pump bag at the end, but I didn't want to have to take all the time and energy to fill it up from start to finish. That's time and energy better spent setting up the rest of camp.

I wish thermarest had been honest about this product.
Customer image
Hallucinati
1.0 out of 5 stars Does Not Self Inflate At All
Reviewed in the United States on September 4, 2024
Just got it today. Took it out to inspect it and to see if it looked tough enough to hold up. All excited, I unscrew the "In" plug and--nothing. It still has the vacuum-wrinkled corners. I know the plug is open and functional because I could blow into it quite easily.

The reason I bought this thing is for the self-inflation. I know the last bit always takes a few pumps of the pump bag at the end, but I didn't want to have to take all the time and energy to fill it up from start to finish. That's time and energy better spent setting up the rest of camp.

I wish thermarest had been honest about this product.
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4 people found this helpful
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Top reviews from other countries

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Laura Hutson
5.0 out of 5 stars So comfortable but doesn’t actually self inflate
Reviewed in Canada on July 4, 2022
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
I used this for a 2 night trip and my tent was set up on some hard gravel ground. I had a very comfortable sleep both night. The firmness of the mattress is adjustable which was a big win. It didn’t make any noise as I rolled around and I was able to comfortably sleep on my side.

It is worth noting that I wouldn’t actually classify this as self inflating. It claims you can blow it up with its bag but you have to manually blow up the bag. Regardless it took me about 10 minutes to pack up and the same to pack down which is reasonable.
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Mr. A. W. Fisher
5.0 out of 5 stars Super comfortable
Reviewed in the United Kingdom on September 25, 2024
Size: Large - 77 x 25 InchesStyle: Original Storage BagVerified Purchase
Comfort 10/10 Warmth is excellent and there is little chance of cold ground affecting sleep. Only drawback is size but that’s the trade off for a quality night of sleep. Better constructed than other sleep mats and screams quality which almost justified the price!
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Jeannot
1.0 out of 5 stars Énorme étron
Reviewed in France on August 27, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
J'ai acheté le produit pour camper 10 jours, le matelas se dégonfle seul au bout du 5 jours d'utilisation, pour ce prix prenez un sous matelas et un matelas Decathlon, 260€ pour dormir par terre après 5 utilisation .... Encore merci
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bobwoj
5.0 out of 5 stars Najlepszy z najlepszych
Reviewed in Poland on July 17, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
Wygodny, trwały, super system pompowania pokrowcem. Jakość na najwyższym poziomie.
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Kindle Customer
5.0 out of 5 stars Ideal for lower back problems
Reviewed in the Netherlands on June 26, 2024
Size: XX-Large - 80 x 30 InchesStyle: Original Storage BagVerified Purchase
Outdoor camping, very comfortable, great back support, sleeps like better than my €800 H5 pocket spring orthopedic mattress at home. I have lower back problems for which I visit a chiropractor every month. Now I can travel again and sleep everywhere I want. Because this mattress is wide I was able to use a bolster pillow.
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