






🛌 Elevate your outdoor sleep game—comfort that makes every campsite feel like home.
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 plush foam core with innovative StrataCore construction, it delivers a 7.0 R-value for superior warmth in extreme conditions. The TwinLock valve system simplifies inflation and deflation, while the large 77x25 inch size offers ample sleeping space. Compact and lightweight for car camping, it includes a pump sack and stuff sack, backed by a limited lifetime warranty and proudly made in the USA.




| ASIN | B07YFXYF9W |
| Benefits | Maximum comfort and support with premium foam and three-dimensional construction |
| Best Sellers Rank | 30,703 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 58 in Self-Inflating Sleeping Mats for Camping |
| Brand | Therm-a-Rest |
| Brand Name | Therm-a-Rest |
| Capacity | 653.17 kg |
| Colour | Lyons Blue |
| Construction Type | StrataCore Construction |
| Cover Material | Polyester |
| Customer Reviews | 4.4 out of 5 stars 808 Reviews |
| Fill Material | Air |
| Global Trade Identification Number | 00040818132258 |
| Included Components | Carry Bag, Pump bag, Sleeping mat, Transport bag |
| Item Depth | 4.25 inches |
| Item Dimensions | 195.6 x 63.5 x 10.2 centimetres |
| Item Dimensions L x W x Thickness | 2L x 0.64W x 0.11Th metres |
| Item Firmness Description | Plush |
| Item Thickness | 10.8 Centimetres |
| Item Type Name | Self-Inflating Camping Sleeping Pad |
| Item Weight | 1.99 Kilograms |
| Manufacturer | Therm-a-Rest |
| Material | Foam |
| Material Type | Foam |
| Mattress Coil Type | Micro Coil |
| Mattress Comfort Layer Material | Comfort Foam |
| Model Name | MondoKing 3D |
| Model Number | 040818132258 |
| Number of Items | 1 |
| Number of Layers | 3 |
| Product Care Instructions | Wipe With Damp Cloth |
| Product dimensions | 2L x 0.64W x 0.11Th metres |
| Size | Large - 77 x 25 Inches |
| Special Features | Inflatable |
| Special feature | Inflatable |
| Specific Uses For Product | Sleeping Pad |
| Target Audience | Adult |
| UPC | 040818132258 |
| Unit Count | 1.0 count |
| Water Resistance Level | Water Resistant |
| Weight Capacity Maximum | 250 Pounds |
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**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?
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**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.
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.
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.
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.
Trustpilot
3 days ago
2 weeks ago