








🛌 Elevate your outdoor sleep game — because roughing it shouldn’t mean roughing out!
The Therm-a-Rest MondoKing 3D Large Sleep Mat is a premium self-inflating camping mattress designed for maximum comfort and insulation. Featuring a 4.25-inch thick foam core with advanced StrataCore construction, it delivers a 7.0 R-value for superior warmth in extreme conditions. Its innovative TwinLock valve system simplifies inflation and deflation, while the 3D vertical sidewalls maximize usable sleeping surface. Compact and lightweight at 4.38 pounds, it’s perfect for car camping, basecamps, and even as a luxury guest bed. Made in the USA with a limited lifetime warranty, it’s the ultimate upgrade for campers who refuse to compromise on sleep quality.




| ASIN | B07YFXYF9W |
| Best Sellers Rank | 104,321 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 218 in Self-Inflating Sleeping Mats for Camping |
| Brand | Therm-a-Rest |
| Capacity | 653.17 kg |
| Colour | Lyons Blue |
| Customer Reviews | 4.2 4.2 out of 5 stars (805) |
| Date First Available | 30 Sept. 2019 |
| Item Weight | 1.99 kg |
| Maximum Weight Capacity | 250 Pounds |
| Model Number | 040818132258 |
| Product Dimensions | 195.58 x 63.5 x 10.16 cm; 1.99 kg |
| Special Features | Inflatable |
M**R
Super comfortable
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!
M**L
super comfortable
I am a large person, I bought this with some trepidation. I needn't have worried - it is fantastically comfortable, as per the hype and the price, and is the best camping bed I have ever slept on. downsides: for the high price there are zero accessories. I expected a puncture repair kit at the very least and maybe a pump sack to inflate it (both available separately of course) but there was nothing. an oversight on my specific purchase or profit maximising?
T**S
Super comfy
The most comfortable camping bed I've found, it's big and bulky but meant for car camping rather than carrying in a pack. Pair it with aa flex tail pump to fill it and in minutes you have a warm and comfortable bed ready!
M**S
Transforms a night under canvas.
I previously used an outwell Dreamboat mattress, it was very comfortable, sadly that reached the end of its life, so I needed to replace it. I hunted for another dreamboat but could not find one. I stumbled across this Thermarest Momdo King, I have previously used lightweight Thermarest, so knew it was a good brand. I decided to take the plunge. I have now used it twice, oh my it is so comfortable, I cannot feel the ground at all, it really is like sleeping in my own bed. Have camped in -2 degrees C and could not feel any cold at all, just back from a weekend camp and did not miss my bed at all. Highly recommend. It really is a camping game changer.
S**L
If thinking of doing lots of camping where comfort is key, these SIM are well worth the investment.
The Therm-a-rest MondoKing XL is well worth the extra cost compared to other SIM’s, we slept 5 nights on the bed and they’ve not required any additional air since setting up the tent. 2 x XL SIM butted together with a king size base sheet provided excellent nights sleep and I am 6’5”. Please remember to read the instructions and allow the mats to self inflate for an hour or so before use and then add a little top up of air.
C**A
Comfortable
I got this for sleeping in my van amazingly comfortable a true touch of luxury
J**S
Comfortable sleep in your tent.
One of the best mattrasses that I got. Really comfy. I am 6,6 tall so one of the few mattrasses that fits for tall people. Usually on the market you get average size products. Highly recomended.
M**D
Expensive, but worth it
One of my biggest problems with camping is being uncomfortable at night and therefore not sleeping properly. I have tried all sorts of air mattresses, but none seem right for my 6'3" height and 15.5st weight. I tend to be mainly a side sleeper, so have to have them inflated enough that my hip does not touch the ground, but this invariably means they are too firm when I am on my back. I bought this mattress hoping the reviews and recommendations I have read were accurate, and they were! Although this is a seriously expensive air bed, and it still large when rolled up, it is as comfortable as my bed at home. The trick it to have just the right amount of air in the mattress for proper support, but not so it's rock hard. The insulation value of the bed is very good, and I felt no coldness seeping up from below as with cheaper mattresses. It is easy to deflate and the one-way deflation valve means when rolling it up it expels the air easily but won't suck any back in of you let go of it. Once rolled it fits easily into the carry bag.
A**R
自動空気入りの仕組みがあるのため、使いやすい。また、マットレスが厚いので、心地がすごく良い。XXL ver.を選らんたので、以前使った他のものに比べで、断然贅沢気分。
M**Y
Ii cellophane che avvolge il materasso è arrivato rotto in più punti. Speriamo bene. Valutazione del materasso da confermare dopo l'uso.
C**W
Review is for the Mondo large size. Comfort. Amazing. Really awesome. 10/10 It never went flat during the night. 10/10 I did have to top it off a few times with air during my 5 day camping trip. Not a big deal. 7/10 Supremely warm as you would expect. Not once did I feel the frozen ground nor the cold coming up through the pad. 10/10 Weight is excellent considering the size, thickness, and comfort. 9/10 Length/width were perfect for me at 6 ft 180 lbs. 10/10 Made in the USA. 10/10 Why manufacturers and consumers make a big deal about self-inflation I have no idea. In cold weather at 10,000 ft I did have to blow some air into it as expected. If you roll it out and put it in the sun for a few hours that will help a lot. Still I would expect to spend a few minutes blowing some air into it. First world problems. I have zeros regrets buying this for my backpack hunting trip. Packing an extra pound or two was well worth not being cold and uncomfortable like I have been on previous trips. Important: Instructions say to store fully inflated.
A**E
Die Matte ist ein Superlative. Man liegt wie auf einer Matratze, super komfortabel und bequem, dazu warm. Die Matte ist super leicht. Der Preis ist gerechtfertigt.
J**T
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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