MondoKing™ 3D Sleeping Pad

  • Therm-a-Rest MondoKing Marine Blue
  • Therm-a-Rest MondoKing Marine Blue
  • Therm-a-Rest MondoKing Marine Blue deflate valve closed
  • Therm-a-Rest MondoKing Marine Blue deflate valve open
  • Therm-a-Rest MondoKing Marine Blue valve closed
  • Therm-a-Rest MondoKing Marine Blue valve open
  • Therm-a-Rest MondoKing pump sack
  • MondoKing Stuff Sack
  • Therm-a-Rest MondoKing | Photo: Mirae Campbell
  • Therm-a-Rest MondoKing | Photo: Mirae Campbell
  • Therm-a-Rest MondoKing
  • Therm-a-Rest MondoKing | Photo: Hage Photo
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Therm-a-Rest

MondoKing™ 3D Sleeping Pad

$259.95
$259.95
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Built with StrataCore construction, camp like royalty with luxury support and 3D shape.
  • Stable Comfort: 4 inches (10 cm) of stabilized loft provides the comfort of home anywhere.
  • 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.
  • Comfortable 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.
  • Easy to Pack: StrataCore construction allows the pad to easily compress and pack away.
  • Mateable: Mates perfectly with other 3D mattresses.
  • TwinLock™ Valve: Utilizing two one-way valves, one for inflation and one for deflation, the TwinLock valve system makes setting up and breaking camp a breeze.
  • Pump stuff sack included
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Description

The MondoKing 3D provides our highest level of comfort and support. Boasting 4.25 inches (11cm) of premium foam, the ultra-cozy pad combines a plush next-to-skin feel with an 7.0 R-value to keep you warm and comfy in any condition or season. StrataCore construction provides lofty three-dimensional shape, and compresses easily to save room in your trunk or closet. The extra-comfy self-inflating pad features the easy-to-use TwinLock valve, allowing the pad to inflate three times faster and deflate five times faster. Like all Therm-a-Rest pads, the MondoKing 3D is made in market to ensure quality and minimize environmental impact. The pad includes a go-anywhere stuff sack with a built-in pump sack.

Tech Specs

Large XXLarge
SKU 14020 14021
Color Marine Blue Marine Blue
R-Value 7 7
Weight (Standard) 4 lb 6 oz 5 lb 8 oz
Weight (Metric) 1.99 kg 2.50 kg
Width (Standard) 25 in 30 in
Width (Metric) 64 cm 76 cm
Length (Standard) 77 in 80 in
Length (Metric) 196 cm 203 cm
Height (Standard) 4.25 in 4.25 in
Height (Metric) 11 cm 11 cm
Thickness (Standard) 4.25 in 4.25 in
Thickness (Metric) 11 cm 11 cm
Packed dimension (Standard) 26 x 10.3 in 31 x 10.3 in
Packed dimension (Metric) 66 cm x 26 cm 79 cm x 26 cm
Top fabric type 50D polyester knit 50D polyester knit
Bottom fabric type 75D polyester 75D polyester
Foam type Urethane Foam Urethane Foam
What's Included Pump/Stuff sack Pump/Stuff sack
Material(s) Polyester, Polyurethane Polyester, Polyurethane
Country of Origin Made in USA of US and Imported Materials Made in USA of US and Imported Materials

Video Gallery

FAQs and Documents

What is solution-dyed fabric?

Solution-dyed fabric uses pre-dyed fibers to minimize the water and energy required to color the fabric. This means that color, or pigment, is added to the material producing the completed fabric. Compared to conventional batch-dyeing—the process of dyeing already produced fabric— solution dyeing requires significantly less water and energy, reducing waste and carbon emissions.

Will the NeoLoft fit in my tent?

Check the floor dimensions of your tent to see if they will accommodate the extra width of a NeoLoft pad. Lengthwise, every NeoLoft size will fit in the typical backpacking tent.

The floor dimensions of most 2-person backpacking tents are typically 50-52 in (127-132 cm) wide by 88-90 in (223-229 cm) long. If your 2-person backpacking tent is 52 in (132 cm) wide, then it will fit two Regular Wides or two Longs, or one of each. If your 2-person backpacking tent is 50 in (127 cm) wide, two of the wider NeoLofts will bulge slightly against the sides, but it will easily fit one Regular Wide or Long and one Regular.

Why is the NeoLoft wider and longer than other pads even though they are the same size (Regular, Regular Wide, Large)?

A Regular Wide NeoLoft measures 26 in x 73 in (66 cm x 185 cm), whereas a Regular XLite™ NXT measures 25 in x 72 in (64 cm x 183 cm). The NeoLoft’s 3D construction utilizes a sidewall band that attaches the top and bottom fabric. The sidewalls bulge out a bit when inflated, adding a touch of extra length and width.

Is the NeoLoft™ a NeoAir® sleeping pad?

No it’s not; we borrowed the ‘Neo’ moniker due to similarities in the internal constructions of the NeoLoft and the NeoAir pads. The NeoAir uses Triangular Core Matrix construction and the NeoLoft has ContourCore Matrix construction.

What’s the difference between Triangular Core Matrix™ construction and ContourCore Matrix™ construction?

Optimized for industry-leading warmth-to-weight ratios, Triangular Core Matrix is used inside our lightest, most compact sleeping pads. ContourCore Matrix uses the same thermally efficient design (two stacked layers of triangular chambers that disrupt convective heat loss) but incorporates a more flexible urethane material that allows for a thicker pad and superior contouring support. It’s heavier and less compact but maximizes comfort.

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.

How Does a Self-Inflating Sleeping Pad Work?

Self-inflating sleeping pads rely on the compressible and rebound-able open cell foam cores to self-inflate. The atmospheric pressure around the pad pushes air into the rebounding open cells when the valve is opened. Check out our blog post for more information.

How Long Should it Take for My Pad to Self-Inflate?

Generally, it takes 5-15 minutes for any of our self-inflating pads to inflate on their own. That 10-minute variance range is probably due to one of the following factors: core construction, trained compression, elevation and temperature. We find the most significant factor is trained compression (i.e. if your pad is new and has been factory rolled on the shelf for some time or stored rolled up for a few months). Check out our blog post to find out why.

Why Doesn’t My Self-Inflating Pad Inflate All the Way?

Self-inflation begins when the valve is opened and ends when equilibrium is reached between the atmospheric pressure outside the cells and the air pressure within the cells pushing the other way. In our experience, most users’ comfort level requires more air than the equilibrium level, which is why self-inflating pads don’t inflate “all the way.” Check out our blog post for more information.

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.

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 warm is my sleeping pad and what is the ASTM testing standard?

ASTM F3340-18 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 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. Classic Valve Replacement Kits can be purchased here.
  • WingLock™ Valve Replacement Kits can be purchased here
  • If you’re having issues with your TwinLock™ Valve, our warranty & repair team is here to help. Please visit thermarest.com/warranty for more info.
  • If you’re not sure which valve you have please refer to the graphic below:
    • Valve Type

How do you inflate and deflate sleeping pads with a WingLock™ Valve?

  • Watch this video for step by step instructions on how to use the WingLock™ Valve
  • To Inflate the WingLock™ Valve:
    • Unroll your sleeping pad and open the valve cap by twisting it counter-clockwise.
    • Use a pump sack or breath to inflate your pad. The one-way valve will prevent air from escaping.
    • Continue inflation until the mattress is fully inflated and close the valve by twisting the valve cap clockwise.
  • To Deflate WingLock™ Valve:
    • Open the wings to open the one-way valve.
    • Open the valve cap by twisting counter-clockwise, allowing air to escape
    • Roll the pad toward the valve end, pushing any remaining air from the pad.

Can I replace my old Therm-a-Rest valve with a new WingLock™ Valve or TwinLock™ Valve?

No. WingLock™ or TwinLock™ Valves cannot be installed on products that originally included a Classic Therm-a-Rest Valve. If you’re not sure which valve you have please refer to the graphic below:Valve Type

What makes the WingLock™ Valve different from Classic Therm-a-Rest Valves?

  • Faster Inflation: Larger valve opening and one-way inflation allows three times faster airflow than our classic valve (with a pressurized air supply the Classic Valve flow rate measures to 2.2 standard cubic feet per minute, where the WingLock Valve flow rate measures to 6.5 standard cubic feet per minute, or a 295% difference).
  • One-Way Inflation: Unique design keeps air from escaping during inflation.
  • Deflation “Wings”: When it’s time to break camp, open the valve and twist the wings to deflate your pad twice as fast as our classic valve.
  • Watch this video to learn more

What makes the TwinLock™ Valve different from Classic Therm-a-rest Valves?

For our larger pads, we developed the TwinLock™ Valve which utilizes two one-way valves: a one-way inflation valve and one-way deflation valve that allows for five times faster deflation than our classic valve. Watch this video to learn more.

How do you inflate and deflate sleeping pads with a TwinLock™ Valve?

  • Watch this video for step by step instructions on how to use the TwinLock™ Valve
  • To Inflate TwinLock™ Valve:
    • Unroll your sleeping pad and open the “IN” valve by twisting it counter-clockwise.
    • Use a pump sack or breath to inflate your pad. The one-way “IN” valve will prevent air from escaping.
    • When the mattress is fully inflated and close the valve by twisting the valve cap clockwise.
  • To Deflate TwinLock™ Valve
    • Open the “OUT” valve by twisting counter-clockwise.
    • The one-way “OUT” valve will keep air from flowing back into the pad.
    • Roll the pad toward the valve end, pushing any remaining air from the pad.

Shipping and Returns

Free Shipping on Orders over $50

We offer complimentary FedEx Ground shipping for orders over $50. Learn More

Orders Shipped in 1-2 Days

We do our best to get all orders out within one business day, Monday through Friday. Learn More

No Hassle Returns

We accept returns within 30 days of purchase. All returned items must be in new condition. Please be sure no dirt, grass or pet hair is on the item you are returning. Learn More

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. Visit our Therm-a-Rest warranty page for more info.

Portrait of our repair shop crew

Overall rating: 4.438889 / 5 from 180 reviews.

AI Generated Review Summary

The MondoKing™ 3D Sleeping Pad offers luxury support and a 3D shape, making it a comfortable choice for camping. Customers appreciate its comfort and ability to provide a great night's sleep, though opinions on air and foam quality are mixed.

Summary topics

  • pad comfort: 24%
  • overall comfort: 4%
  • camping experience: 8%
  • night sleep quality: 8%
  • sleep quality: 16%

Review topics: ["fit","size","weight","problem","bag","quality","looks","value","shipping","construction","comfort","feels","air","width","layer","packs","works","pad","mattress","sleep","night","camping","mondoking","buy","valve","foam","bed","inflation","temps","trips"].

Review highlights

  • "Absolute dreamy sleep... Actually prefer the MondoKing to my home mattress, which my wife picked out." — Howie
  • "I am quite pleased and highly recommend this one for those who like top notch gear and absolute comfort." — Robert K.
  • "Both equal quality sleep." — Alex

Reviews

Love the bag it comes

"Love the bag it comes with to inflate super easy, really thick and comfy. Rolls up into a nice small travel package. Got one for me one for my 6 foot husband we’re both very happy."

— Sandra M. (5/5)

The MondoKing is a gamechanger

"The MondoKing is a gamechanger for a comfortable night's sleep. I seriously sleep in this on my living room floor like once a week instead of my bed--that's how much I love it!"

— Addie H. (5/5)

Can't find replacement bag.

"Great Mondo 3D xxl pad but lost storage/carry bag and can't find replacement."

— Sandy (4/5)

Great sleeping pad

"This pad is fantastic, I used it on a trip that went from 25C to -1C. The only downside is that it is bulky. But worth it"

— Vish (5/5)

Worked great as a cot

"Worked great as a cot pad!"

— JL S. (5/5)

Fantastic luxury

"Basecamp luxury! Get the largest size to give you lots of moving around room, since you're leaving it at Basecamp anyways."

— Ronald D. (5/5)

Awesome! If you’re looking for

"Awesome! If you’re looking for an at home mattress feeling in a portable mattress, this is it. I’ve worked in the Outdoor industry for over 30 years and this is the most comfortable mattress I have ever used. Inflating with the stuff sack pump sack combo is brilliant and works well"

— steve k. (5/5)

This sleeping pad is incredible!

"This sleeping pad is incredible! Didn't feel any coldness from the ground and the temperatures were in the mid-low 40's. It was also very comfortable."

— COLLIN N. (5/5)

Perfect fit for a nuCamp Tab 360 bed

"I have a nuCamp Tab 360 and the mondoking 3d XXL is the perfect fit for their twin bed. Used over the top of the cushions in the camper, it makes the bed so much more comfortable. And I love how it rolls up small for easy storage. Way better than a mattress topper."

— Lesa (5/5)

Great purchase, very glad I

"Great purchase, very glad I spent the money. Very comfortable, packs much better than I anticipated and you can make it as firm as you need it or leave a little air out for a softer feel. It also is very easy to inflate."

— Anthony W. (5/5)

Q&A