MondoKing™ 3D

Sleep like camp royalty with our thickest luxury mattress.
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$189.95 - $219.95
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Sleep like camp royalty with our thickest luxury mattress.


Are you always on the lookout for something bigger and better? Your ship has arrived with the MondoKing 3D. Simply put, the MondoKing 3D is the biggest Therm-a-Rest® mattress ever. Vertical sidewalls create 20% more usable sleep surface so you have room to sleep like starfish. Dual valves allow compressible foam core to expand and inflate quickly when unpacked. Stuff sack included.
WARNING: Can expose you to toluene, which is known to the State of California to cause birth defects or other reproductive harm.

    Features

  • Stable Comfort: 4 inches (10 cm) of stabilized loft provides the comfort of home anywhere.
  • Updated Fabric: Supple stretch-knit fabric provides deluxe breathability and plush surface.
  • Giant Sleep Surface: Vertical sidewalls maximize useable sleep surface.
  • Incredibly Warm: Foam core delivers all-season warmth to assure a great night's rest anytime.
  • Self-Inflating: Dual valves allow compressible foam core to expand/inflate when unpacked; just a few breaths top it off to your ideal firmness.
  • Mateable: Mates perfectly with other 3D mattresses.
  Large XXLarge
SKU 10761 10762
Color Marine Blue Marine Blue
R-Value 11.4 11.4
Weight (Standard) 5 lbs 8 oz 6 lbs 12 oz
Weight (Metric) 2.50 kg 3.07 kg
Width (Standard) 25 in 30 in
Width (Metric) 63 cm 76 cm
Length (Standard) 77 in 80 in
Length (Metric) 196 cm 203 cm
Thickness (Standard) 4 in 4 in
Thickness (Metric) 10 cm 10 cm
Packed dimension (Standard) 9 in x 26 9 in x 31
Packed dimension (Metric) 23 cm x 66 cm 23 cm x 79 cm
Top fabric type 50D polyester knit 50D polyester knit
Bottom fabric type 50d Polyester 50d Polyester
Foam type Urethane Foam Urethane Foam
Country of Origin USA*Built of the Finest U.S. and Global Materials USA*Built of the Finest U.S. and Global Materials
How should I store my sleeping pad?
  • Self-Inflating: We recommend storing the mattress unrolled and fully inflated in a dry place with the valve open. This will ensure the foam self-inflates faster when camping. Storage for a prolonged time in a damp space may cause mildew damage which is not covered by our Limited Lifetime Warranty.
  • NeoAir: We recommend leaving the valve open and storing your mattress rolled tight in a stuff sack to protect it from dirt and sharp objects.
What is the best way to clean my sleeping pad?

Regular cleaning will extend the life of your mattress, especially if you sleep in direct contact with its surface.

Do not put your mattress in the washing machine. Cleaning with a hose or in a bathtub is best. Do not forget to close the valve while washing. For general cleaning, a quick scrubbing with Formula 409®, BioClean All-Purpose Cleaner, or other general household cleaner is best.

Watch the video: How to Care for Your Therm-a-Rest® Mattress

For tree sap, spot clean with a cotton rag soaked in rubbing alcohol. This will take some work and sap will likely leave a stain. However, a dusting with talc or baby powder when you are done should eliminate any residual stickiness.

How warm is my sleeping pad and what is the ASTM testing standard?
The ASTM is a new testing standard that provides R-value ratings for sleeping pads. While Therm-a-Rest has always used R-value to rate our sleeping pads, this new standardization will allow campers to make “like-for-like” comparisons with our competitors pad. Head to a blog for an in-depth explanation.
What should I do if I think my sleeping pad is losing air?
If you think that your NeoAir or self-inflating sleeping pad are losing air, it’s possible that you have a puncture in your pad. If you want to repair your pad at home, check out this blog post. If you’d like to send your pad to our Seattle repair shop, head over to our warranty page.
How should I inflate my self-inflating pad the first time?
For best performance, inflate your self-inflating pad with air by breath or pump and sack and leave the mattress fully inflated for 2-4 hours before your first use.
How do I inflate my self-inflating pad during winter?
In freezing conditions, avoid breath inflating your self-inflating pad. The moisture from your breath can freeze inside the mattress. The mattress may self-inflate slower in cold weather. Use a pump sack or electric pump if the pad needs additional air.
What is the benefit of stretch knit fabric on my sleeping pad?
For comfort-conscious campers, we use stretch knit fabric for unrivaled support and superior next-to-skin feel. The fabric conforms to your body to provide supple support as you enjoy your nights under the stars.
Can I replace the valve on my Therm-a-Rest mattress?

Yes. A Therm-a-Rest Valve Replacement Kit will replace all metal and plastic mattress valves. Instructions for the kit can be found here.

Watch the video: Repairing Your Therm-a-Rest® Mattress

Limited Lifetime Warranty

Every piece of Therm-a-Rest gear is designed to endure the rigors of your time in the backcountry. We offer a Limited Lifetime Warranty on all products, except electronic devices, which have a 2-year Limited Warranty.

Better Sleep Guarantee

All Therm-a-Rest sleeping bags and quilts are also covered by our Better Sleep Guarantee. When you wake up on a Therm-a-Rest sleeping bag or quilt, we're confident you'll wake up feeling better than ever. If you are not completely satisfied, return it within three months with the original receipt of purchase and we will give you a full refund- no questions asked.

To get your gear repaired, start a warranty claim or to learn more, visit Therm-a-Rest Warranty for more info.

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