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Therm-a-Rest MondoKing 3D (2018) Self-Inflating Sleeping Pad



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Availability: In Stock!

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Item # TARA6201M
If you are looking for maximum comfort and a sprawling sleeping base for your next camping trip, look no further. The Therm-a-Rest MondoKing 3D self-inflating sleeping pad is 4" thick, has a comfortable "next to skin" feel and delivers an R-value (11.4) worthy of year-round use.
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If you are looking for maximum comfort and a sprawling sleeping base for your next camping trip, look no further. The Therm-a-Rest MondoKing 3D self-inflating sleeping pad is 4" thick, has a comfortable "next to skin" feel and delivers an R-value (11.4) worthy of year-round use.

Designed for campers who aren't necessarily looking for a streamlined backpacking pad and aren't concerned with packed weight, the MondoKing 3D offers extra-thick foam padding for warmth and comfort. A full 4" layer of foam serves as a comfortable sleeping base and the ultra-responsive foam core contours to your body to provide great comfort and support. The Mondo King 3D provides 20% more usable sleep surface, and the vertical sidewalls allow for virtually seamless mating to another.

The MondoKing 3D's self-inflating design allows you to simply unroll the pad and open the integrated air valve. The open-cell foam core responds by soaking up air, similar to a sponge absorbing liquid. Once the MondoKing 3D has inflated, you can achieve the full 4" thickness by adding a few puffs of air or fine-tune the density by pressing down lightly on the pad to release air.

The Therm-a-Rest MondoKing 3D is available in Large (25" x 77") and XXLarge (30" x 80") size options.

California residents: view proposition 65 WARNING

  • Vertical sidewalls provides 20% more usable sleep surface
  • Foam core offers better stability and warmth than an air mattress twice as thick
  • Self-inflating for ease of use; no pump required!
  • Mates perfectly with another 3D mattress



Best Use Backpacking, Camping
R-Value 11.4
Item Weight Large: 4 lbs 11 oz
XXLarge: 6 lbs
Dimensions Large: 4" x 25" x 77"
XXLarge: 4" x 30" x 80"
Other Stuff Sack Included
Warranty Limited Lifetime
Type Self-Inflating Sleeping Pad
Packed Size Large: 7" x 26"
XXLarge: 7" x 31"


Real Customer Reviews

Average Rating:
(based on 21 real customer reviews)

1-10 of 21

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This thing is awesome
Reviewed by Scott G. - November 22, 2018

Likes: Very comfortable and easy to use. Most comfortable sleeping pad I've ever used. Will buy another one

Dislikes: None

Exceptional Comfort and Warmth
Reviewed by Miles L. - September 11, 2018

Likes: Size is awesome for a 5'8" person I have plenty of room and width to be in any position. The thickness of the pad is unmatched by anything I have rested on, don't feel any ground obstruction with the right inflation level. If looking for a car camping option I would recommend this and I am even looking at a second one to join them together for camping with significant others / having for anyone I go camping with. Cheers to an amazing and true to comfort expectations Therm-a-rest product!

Dislikes: The included carry bag is a little snug when having to repack, but just roll the air out one way and then flip and roll the pad the other way and I found I could get the bag to fit snuggly over the deflated pad then.

Cant get more comfortable than this.
Reviewed by Robert L. - August 17, 2018

Likes: Most comfortable thing I've slept on wife got one I was so jealous I had to get one. Square on sides they pair nicely with another. R value is unheard off. What cold ground. I'm side sleeper and could jump on this this and not touch bottom 3.5 in thick. Self inflating is nice.

Dislikes: The weight. Luxury comes at a 5lb haul. Not bad in comparison.
Takes awhile to inflate. Pain to deflate. More size options could be nice.

Awesome product!
Reviewed by Jennifer D. - August 4, 2018

Likes: Easy to inflate and very comfy

Dislikes: Difficult to roll up.

I used the pad in the mountains of Wyoming right after I purchased it.
Reviewed by Patricia T. - August 2, 2018

Likes: I have arthritis and this pad provides enough padding, that I don't get stiff and sore. It was much warmer than the air mattress I used to use.

Dislikes: None

Expensive but luxurious to sleep on!!!
Reviewed by Scott A. - July 5, 2018

Likes: This is by far the best self inflating, collapsable mattress you can sleep on.

Dislikes: Due to it being 4 inches thick when inflated, it takes awhile to roll out all of the air.

Incredibly comfortable
Reviewed by Paul V. - June 27, 2018

Likes: Better than most beds

Dislikes: It is very slow to inflate

Camping in comfort!
Reviewed by Doug R. - June 13, 2018

Likes: It's big, it's cushy and I wouldn't go car camping without it!

Dislikes: Nah

Very Comfortable, kept us off the cold ground
Reviewed by Sarah S. - June 9, 2018

Likes: Easily self inflates, with a little extra breath to top it off if it's not firm enough for your liking. Bought two to make one "full size" mattress for our camping trips, stays together really well with the Thermarest straps (a product sold separately). The mattresses fit inside the Kelty Trailridge 4 with plenty of room to spare for other gear storage if needed, but not a 3rd camper, maybe a pet. Kept us warm off the ground in the Pacific Northwest on a 52 degree night. It's actually not too hard to get it to fit back in the bag if you fold it into squares first, use your body weight to push the air out as you fold, and then unfold it and roll it up, again using your body weight at the very end of rolling it to squeeze out any additional air.

Dislikes: Nothing yet.

Unparalleled Comfort. Excellent Build Quality.
Reviewed by Daniel B. - April 20, 2018

Likes: Pure Camping Comfort!@ This is a super comfy mattress. Surface can be inflated to desired feel. Extremely well made. Great materials. Feels nice on skin.

Dislikes: I found this mattress VERY difficult to roll up & stow away. Just couldn't get it back to a size that was anything close to how it was before I inflated it.

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