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Therm-a-Rest MondoKing 3D Self-Inflating Foam Camping Mattress, Standard Valve (2018 Model), XX-Large - 80 x 30 Inches

4.4 4.4 out of 5 stars 354 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Size XX-Large - 80 x 30"
Brand Therm-a-Rest
Color Blue Depths
Product Dimensions 80"L x 30"W x 4"Th
Specific Uses For Product Bed, Sleeping Pad
Target Audience Adult
Number of Items 1
Item Firmness Description Plush
Material
Foam
Item Weight
6 Pounds

About this item

  • Luxury self-inflating foam air mattress offers comfort and warmth for camping, home, and travel
  • Mattress provides 4 inches of stabilized loft for the comfort of home anywhere; vertical sidewalls maximize usable sleep surface
  • Perfect for car camping, expedition basecamps, RVs, and boats, it also makes an excellent guest bed at home
  • Dual valves allow compressible foam core to expand and inflate when unpacked; mate perfectly with a second mattress to create an extra-large sleeping pad for two people
  • XX-Large size measures 80x30x4 inches expanded, 7x31 inches rolled, weighs 6.75 pounds; stuff sack included; limited lifetime warranty; made in the USA

There is a newer model of this item:

Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad
Therm-a-Rest MondoKing 3D Self-Inflating Camping Sleeping Pad
$274.95
(735)
In Stock
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From the manufacturer

topo hero image with watermark

Therm-a-Rest

Why focus on comfort? It's the simple belief that the better you rest, the better you play. It's a universal truth that is readily apparent in our daily lives, but one that is too often overlooked at play. From the essential, life-preserving warmth that we've provided to some of the world's most significant expeditions, to a simple seat that turns a rocky outcrop into the most amazing lunch stop you've ever dreamed of, the right dose of comfort makes everything better by allowing you to be at your best.

Photo by: Mirae Campbell

MondoKing 3D

Mondo King 3d

Strata Core

made in the usa

MondoKing Packed

Stable Comfort

4 and a quarter inches of luxurious foam-stabilized loft brings the comfort of home to the outdoors

StrataCore Construction

Yielding an impressive warmth-to-weight ratio, StrataCore uses a continuous layer of thermal foam nestled between alternating ridges of air and foam

Made in the USA

Made in the USA of the finest US and global materials.

Easy to Pack

StrataCore construction allows the pad to easily compress and pack away

valves
MondoKing 3d

What is R-value?

R-value is a measure of thermal resistance; the higher the R-value, the more thermally resistant the material or structure is. By selecting an appropriately insulated sleeping pad, you’ll stay warm throughout the night, and wake up prepared for the trail.

trail pro Mondo King NeoAir Venture NeoAir Topo Luxe topo
Trail Pro MonoKing 3D NeoAir Venture NeoAir Topo Luxe NeoAir Topo
Customer Reviews
4.7 out of 5 stars
789
4.6 out of 5 stars
735
4.5 out of 5 stars
410
4.2 out of 5 stars
81
4.3 out of 5 stars
64
Price $154.95 $239.95 $136.25 $189.95 $97.97
R-Value 4.4 7.0 2.2 3.7 2.3
Weight (regular) 1 lbs 13 oz (Large) 4 lb 6 oz 1 lbs 3 oz 1 lbs 7 oz 1 lbs 5 oz
Thickness 3 inches 4.25 inches 2 inches 4 inches 3 inches
Packed Dimension (regular) 11 in x 8.8 in 10.3 in x 26 in 9 in x 5 in 9.5 x 5.7 in 9.2 x 5.5 in
Top Fabric Type 50D polyester knit 50D polyester knit 50D polyester 50D polyester knit 50D polyester
Self Inflating ✓
Repair Kit Included ✓ ✓ ✓ ✓ ✓
StrataCore Consturction ✓ ✓
Made in the USA ✓ ✓ ✓ ✓ ✓
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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Therm-a-Rest MondoKing 3D Self-Inflating Foam Camping Mattress, Standard Valve (2018 Model), XX-Large - 80 x 30 Inches

Therm-a-Rest MondoKing 3D Self-Inflating Foam Camping Mattress, Standard Valve (2018 Model), XX-Large - 80 x 30 Inches

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Product guides and documents

User Manual (PDF)

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
354 global ratings

Customers say

Customers like the quality, comfort, and performance of the air mattress. For example, they mention it's the best sleeping pad they've ever slept on, it works perfect for camping, and the insulation keeps them comfortable. That said, some complain about the ease of rolling up and have different opinions on weight, inflation, and size.

AI-generated from the text of customer reviews

83 customers mention75 positive8 negative

Customers like the comfort of the air mattress. They say it has a great feel, and is like sleeping in bed at home. The insulation keeps them comfortable in some 40 degree nights, and it's stable and supportive.

"I slept on this mattress every night for over 2 years and I slept well and woke up pain free every morning...." Read more

"This is definitely one comfy mattress. That said, it did have a couple of issues, which is why I wish I could rate it at 3.5 stars...." Read more

"...x 30in mattress to sleep on a wood floor in my house, and it's really comfortable...." Read more

"This is the most comfortable camping mattress I've ever used. I'm over 6ft and 280 lbs (1.8 m & 127 kg)...." Read more

48 customers mention41 positive7 negative

Customers like the quality of the air mattress. They mention it's an excellent mattress, the best sleeping pad they've ever slept on, and a perfect camping mattress. Some say the sides did not self-inflate. Overall, most are satisfied with the quality and comfort of the product.

"...Therm-A-Rest has always been a quality brand and this model is well-made, durable and comfortable...." Read more

"...The durability of this is great, as I've mentioned I sleep on this every night, it is my bed...." Read more

"This is the best sleeping pad I have ever slept on. I am a big guy at 250 lbs...." Read more

"...Turns out this pad was way better than an air bed. It was stable and supportive...." Read more

15 customers mention15 positive0 negative

Customers are satisfied with the performance of the air mattress. They mention that it works great for camping, it's comfortable, and it makes camping more doable. Some say that it'll also work great on the tent floor or back of a vehicle.

"...for hiking due to the size and weight, but it is perfect for car camping or tent camping as long as you can drive to your campsite...." Read more

"...Now my cot is like sleeping on a twin bed! This will also work great on the tent floor or back of a vehicle if that's your thing...." Read more

"I LOVE this mattress! I have used it several times now and it works like a charm. I have not had any problems with it inflating or deflating...." Read more

"...It's a bit heavy so it won't go on a backpacking trip but perfect for car camping or bad beds when traveling...." Read more

14 customers mention11 positive3 negative

Customers like the warmth of the air mattress. For example, they say it's plenty warm, the foam inside keeps them warmer, and it completely prevents heat loss to the ground. That said, some say it’s perfect for cold weather camping.

"...It also adds warmth and completely prevents heat loss to the ground. It saved me on a trip that I probably took too light of a sleeping bag on." Read more

"...sleeping bags and it was snowing and in the 20's and we never felt cold seeping through them. Best night's sleep during our winter hunts...." Read more

"...This thing is so well insulated it actually makes it hard to cool off at night. Not a gripe, just an FYI...." Read more

"...When I sleep on this pad I am plenty warm. The foam inside keeps you warmer then just plain air...." Read more

43 customers mention13 positive30 negative

Customers have mixed opinions about the inflation of the air mattress. Some find it easy to inflate, while others say it takes a bit of work. Some customers also mention that it doesn't inflata as fast as some other models.

"...Being brand new, it will not self inflate much. You have to blow into it...." Read more

"...First was that it took over a week to fully inflate it the first time. I followed their instructions and got a two inch mattress...." Read more

"...Once the foam has relaxed, the mattress should self inflate much more quickly, and you can then top it off with just a few breaths if you'd like it..." Read more

"...Deflating then is the most challenging part, and requires one or two persons’ body weight (usually knees as I’m rolling it up) to really get the air..." Read more

40 customers mention18 positive22 negative

Customers are mixed about the size of the air mattress. Some mention it's large and heavy, but so comfortable. That said, it'll fit the space very nicely. However, others say it'd take a fair amount of space in their car's already small trunk. The carry bag is barely large enough to get the mattress back into.

"...It's big and bulky, but I wanted a bigger self inflating mattress. I’ve never been able to sleep comfortably on a cot.... until now...." Read more

"...That being said, it's surprisingly small and light when rolled up...." Read more

"...And it's huge!..." Read more

"...It is lighter than my old air mattress and leaves more room in my tent as well as not pushing me up against the side of the tent. Still love it" Read more

28 customers mention14 positive14 negative

Customers are mixed about the weight of the air mattress. Some mention it's comfortable, not too heavy, and leaves more room in their tent. However, others say that it'd be too large and heavy for backpacking.

"...That made it easy to inflate. There is a lightweight battery operated pump that hikers can use if they wish...." Read more

"...It's big and bulky, but I wanted a bigger self inflating mattress. I’ve never been able to sleep comfortably on a cot.... until now...." Read more

"...Super insulated from below, and thick enough to provide super cushion for my hips and shoulders if I want to sleep on my side...." Read more

"...Personally, I think it’s bit large & weighty for camping with any serious trekking involved, but perfect if your driving & pitching a tent near..." Read more

15 customers mention3 positive12 negative

Customers find the air mattress hard to roll up and put away. They say it's big, heavy, and annoying to pack up.

"I had to take a star off due to the difficulty getting it back in the carrying bag...." Read more

"...The only reason I did 4 stars was they are not easy to roll back up...." Read more

"While this mattress is very comfortable it is insanely difficult to get rolled back up...." Read more

"...It is easy to roll up once you figure out the system to it and never lost air. It is light but large about the size of a sleeping bag...." Read more

Top reviews from the United States

John C.
5.0 out of 5 stars Bought 2 Mondoking 3D XXL. I'm expecting reliability being a thermarest.
Reviewed in the United States on February 15, 2020
Verified Purchase
I bought 2 Thermarest Mondoking 3D XXL 2018 model instead of the 2019 model for a reason. Material is thicker & rougher in 2018 model but softer & thinner for 2019 model. I would rather have thicker than softer material for the mattress. It feels like a typical Thermarest mattress to me.

I bought it to use with my queen size sleeping bag. Being brand new, it will not self inflate much. You have to blow into it. Once you leave it inflated for a few days, it should self inflate to about 80% capacity. You have to fill the other 20% yourself. This is the way it works. Don't expect 100% self inflation on any self inflating mattress.

I still have 2 other Thermarest I've had for 20 years and they still work just fine. That is a testament to Thermarest quality.

I did do some research and saw those cheaper Chinese self inflating mattresses. As temping as their prices are, you can't put a price on quality when you are camping for a few weeks and you have a leak. Thermarest is made in the GOOD OLD USA BABY!!!! Cry once (twice for me) on price and be happy for many years.

You should also know that when you store any self inflating mattress, you should leave it inflated with the valve open. Do not store it compressed with valve closed.

The best way to get roll these big Thermarest is to leave the valve open, roll it up. Then close the valve. If it fits in the stuff bag, then good. If not, unroll it without opening the valve. Try rolling it tighter. Make sure you have your valve closed. When you have about 2 feet from the end, you will have to open the valve to let the air out. Keep a tight roll til the end. Close the valve. Yes people. It take a little effort. if you don't want to put in a little effort, sleep on the ground or bring a 4" memory foam mattress as your base. Just a pain in the butt for space if you ask me.

I will write an update once I use it during summer camping in Eastern Sierra Nevada.
5 people found this helpful
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RickPawl
5.0 out of 5 stars Best air mattress I’ve ever used anywhere ever.
Reviewed in the United States on April 20, 2021
Verified Purchase
I slept on this mattress every night for over 2 years and I slept well and woke up pain free every morning.
I am a travel photographer and I lived in my van as I drove all over North America from the Arctic Circle in Alaska to Key West Florida. I tip the scales at 268 pounds so I needed some thing that was not only comfortable but that could withstand that kind of weight every night. The foam/air combination is really the best of both worlds. This is not an air mattress for hiking due to the size and weight, but it is perfect for car camping or tent camping as long as you can drive to your campsite.
After 2 1/2 years on the road I settled down again, got an apartment, and continued to sleep on this mattress for another year before my cat accidentally got her claws into it. I was so glad they still made them so I ordered up another one and it is just as comfortable as the first one. I did try the new and improved version, but after a couple nights I decided I didn’t like it as well as the original, so I returned it and got the dark blue version again.
Therm-A-Rest has always been a quality brand and this model is well-made, durable and comfortable.
I highly recommend it, but if you get one and use it the way I did driving around a lot just remember to leave one of the valves open so that if you change elevation the expanding air can get out. You wouldn’t want to inflate it at sea level and then drive over an 11,000 foot pass in the mountains or something like that.
12 people found this helpful
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Rune Skylar
4.0 out of 5 stars Very comfortable, but...
Reviewed in the United States on January 21, 2017
Verified Purchase
This is definitely one comfy mattress. That said, it did have a couple of issues, which is why I wish I could rate it at 3.5 stars. First was that it took over a week to fully inflate it the first time. I followed their instructions and got a two inch mattress. After a few days of leaving it open again it was three inches, and finally after a little over a week it was four inches.

My second main problem with this mattress was that it was extremely difficult to deflate. I bought it to take on a trip where I would have to set up a new camp every night. This mattress makes me cringe at the thought of trying to forcibly deflate it every morning and try to stuff it back in its sack. I've been debating if it was worth it, or if I should go with a different mattress for my trip.

That said, if you are looking for a comfortable bed, you won't find anything better than this.
25 people found this helpful
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Eric Bergfield
5.0 out of 5 stars This is actually my bed
Reviewed in the United States on March 24, 2018
Verified Purchase
I've been using this every night to sleep on for the past year! This is my bed.

I'm 6ft 3in tall and 185lbs, and I bought the 80in x 30in mattress to sleep on a wood floor in my house, and it's really comfortable. I don't even notice I'm sleeping on what is effectively a memory foam mattress. I'm a tall guy, and I'm glad I bought the larger version of this mattress, because there is comfort in knowing you can roll around without falling off, plus if you're spooning your partner you can fit them too.

The durability of this is great, as I've mentioned I sleep on this every night, it is my bed. After about two weeks the air-valves do need to be opened up to allow the mattress to reinflate itself, because as it slowly loses air and becomes less firm, the mattress is more likely to move around and deform when you sit/lay on it.

The only con I can think about with respect to this product, has more to do with how I use it than how %99 of buyers will be using it... Because I use it every night, I do have to open/close the air-valves every two weeks to reinflate the mattress, and these valves are potential failure points in the very-long-term. However, I have a trick when opening and closing them, I grip the back end with one hand, and unscrew the other end with my other hand: this reduces tensile stress on the fabric, which will prevent wear and greatly increase the lifespan on the mattress.

I recommend this product, but I don't think it's an "every night sleeping mattress" which is how I'm currently using it, as I tend to toss a lot while I sleep, and honestly I probably need a queen size bed to really sleep well.
2 people found this helpful
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Top reviews from other countries

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Melody Dessiré
5.0 out of 5 stars Muy cómodo
Reviewed in Mexico on April 4, 2018
Verified Purchase
Altamente recomendado, se usó en interior, por 4 noches, la primera noche no fue tan cómoda ya que no se le reguló bien la cantidad de aire, pero arreglado ese detalle las Siguientes noches fueron de descaso total.
One person found this helpful
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Joshua Samuel
5.0 out of 5 stars I think i may finally get a good nights sleep when camping!
Reviewed in the United Kingdom on January 26, 2018
Verified Purchase
I haven't tried yet camping, so this is only based on setting it up at home and lying on it... and it is a bit of a faff to both blow up the first time and put away.... HOWEVER my goodness it is comfortable and spacious... i am 6ft 5" and have tried every type of camping bed from cots, to blow up mattresses etc etc... this doesn't creak, it is surprisingly comfortable (like lying on a firm mattress on a normal bed), and you don't fall off of it ....has to be said I like it... !
5 people found this helpful
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Guenther Danhofer
5.0 out of 5 stars Trotz meinem starkem Uebergewicht (1xx kg) sehr gut !
Reviewed in Germany on November 27, 2018
Verified Purchase
Ich habe die 75cm breite und 10cm dicke Variante und liege trotz meinem dreistelligen Uebergewicht extrem bequem.

Anfangs hatte ich die Matratze zu stark aufgeblasen.
Wenn man aber so viel Luft rauslaesst dass im liegen die schwerste Stelle gerade noch nicht den Boden beruehrt so liegt man wie auf einer Wolke.

Man darf sich nur nicht irritieren lassen dass man dann z.B. beim sitzen aufgrund der kleinen Koerperauflageflaeche (Gesaess) die Matratze voellig zusammendrueckt.
Beim Luft rauslassen liegen und den Koerper moeglichst in Schlafstellung halten (auch Kopf und Schulter muessen aufliegen).
Mit einer freien Hand einfach das Ventil aufschrauben.

Von mir definitiv eine klare Kauf-Empfehlung ! :-)
2 people found this helpful
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ROLLAND
5.0 out of 5 stars Très confortable
Reviewed in France on September 6, 2017
Verified Purchase
Très confortable, équivalent à un matelas fixe, mais en pliable. Cependant légèrement difficile à rouler.
Après de nombreuses nuits dessus, je suis toujours satisfait.
2 people found this helpful
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--NDH1210--
5.0 out of 5 stars One for the ages....
Reviewed in the United Kingdom on August 16, 2017
Verified Purchase
More or less fully inflates on its own and is probably the best sleeping mat I'll ever own...
One person found this helpful
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