20 Best Tri Fold Foam Camping Mattress [2022]

Are you looking for the best Tri Fold Foam Camping Mattress? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Tri Fold Foam Camping Mattress.

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1 Best Price Mattress 4 Inch Trifold Memory Foam Mattress Topper with Cover, CertiPUR-US Certified,... Best Price Mattress 4 Inch Trifold Memory Foam Mattress Topper with Cover, CertiPUR-US Certified,...
2 Cushy Form Floor Mattress - Foldable 4 Inch Foam Camping Bed w/Case for Adults & Kids - Folding... Cushy Form Floor Mattress - Foldable 4 Inch Foam Camping Bed w/Case for Adults & Kids - Folding...
3 Milliard Tri Folding Memory Foam Mattress with Washable Cover Twin XL (78 inches x 38 inches x 6... Milliard Tri Folding Memory Foam Mattress with Washable Cover Twin XL (78 inches x 38 inches x 6...
4 Comfortable Memory Foam Camping Mattress Pad Twin - 75’’x 36’’x3’’ Waterproof Foldable... Comfortable Memory Foam Camping Mattress Pad Twin - 75’’x 36’’x3’’ Waterproof...
5 Folding Mattress, Inofia Memory Foam Tri-fold Mattress with Ultra Soft Bamboo Cover, Non-Slip Bottom... Folding Mattress, Inofia Memory Foam Tri-fold Mattress with Ultra Soft Bamboo Cover, Non-Slip...
6 S SECRETLAND Folding Mattress, Portable Tri-fold Gel Memory Foam Mattress Topper with Washable... S SECRETLAND Folding Mattress, Portable Tri-fold Gel Memory Foam Mattress Topper with Washable...
7 Cozzzi Folding Mattress - Trifold Foam Mattress Topper with Removable Cover -Lightweight and... Cozzzi Folding Mattress - Trifold Foam Mattress Topper with Removable Cover -Lightweight and...
8 Molblly Folding Mattress,4.5 Inch Portable Tri Fold Twin XL Mattress Topper,Folding Memory Foam... Molblly Folding Mattress,4.5 Inch Portable Tri Fold Twin XL Mattress Topper,Folding Memory Foam...
9 Inofia Folding Mattress Full, 5-Inch Tri-fold Memory Foam Mattress, Foldable Mattress with Non-Slip... Inofia Folding Mattress Full, 5-Inch Tri-fold Memory Foam Mattress, Foldable Mattress with...
10 Portable Mattress - Folding Memory Foam Guest Fold Up Bed w/Case | Tri-Fold (6 Inch) Travel Away... Portable Mattress - Folding Memory Foam Guest Fold Up Bed w/Case | Tri-Fold (6 Inch) Travel Away...
11 Zinus Gel Memory Foam 5 Inch Tri-Fold Comfort Portable Folding Floor Mat, Single Zinus Gel Memory Foam 5 Inch Tri-Fold Comfort Portable Folding Floor Mat, Single
12 Molblly Folding Mattress 4 inch Tri-Fold Full Memory Foam Mattress Topper with Cooling Gel... Molblly Folding Mattress 4 inch Tri-Fold Full Memory Foam Mattress Topper with Cooling Gel...
13 Best Choice Products 4in Portable Mattress Folding Mattress Topper Full for Camping, Guest, Toddler,... Best Choice Products 4in Portable Mattress Folding Mattress Topper Full for Camping, Guest,...
14 Willpo Memory Foam Camping Mattress for Kids - Portable Comfortable Floor Small Pad Outdoor Indoor... Willpo Memory Foam Camping Mattress for Kids - Portable Comfortable Floor Small Pad Outdoor...
15 Milliard Full Tri Folding Mattress with Washable Cover (73 inches x 52 inches x 4 inches) Milliard Full Tri Folding Mattress with Washable Cover (73 inches x 52 inches x 4 inches)
16 Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Blue Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Blue
17 Milliard Tri-Fold Foam Folding Mattress and Sofa Bed for Guests (Full) Milliard Tri-Fold Foam Folding Mattress and Sofa Bed for Guests (Full)
18 SINWEEK Folding Mattress with Storage Bag 4' Foldable Mattress Trifold Mattress Topper, CertiPUR-US... SINWEEK Folding Mattress with Storage Bag 4" Foldable Mattress Trifold Mattress Topper,...
19 Milliard Premium Folding Mattress, Memory Foam Tri Fold with Waterproof Washable Cover, Queen Size... Milliard Premium Folding Mattress, Memory Foam Tri Fold with Waterproof Washable Cover, Queen...
20 Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Grey, Single size, Play Mat, Foldable bed, Guest... Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Grey, Single size, Play Mat, Foldable bed,...
SaleBestseller No. 1
Best Price Mattress 4 Inch Trifold Memory Foam Mattress Topper with Cover, CertiPUR-US Certified,...
  • 1.5-inch memory foam top plus 2.5-inch high density base foam layer for added comfort and support
  • Portable trifold design great for camping, overnight guests, car trips and sleepovers
  • 100% poly jacquard cover with slip proof bottom; Spot clean only
  • Made with CertiPUR-US certified foams, 3-year manufacturer's warranty
  • Topper comes rolled in box. Please allow up to 72 hours for the topper to rise and any odors to dissipate. Product Dimensions: Open 75'' x 33'' x 4''...
Bestseller No. 2
Cushy Form Floor Mattress - Foldable 4 Inch Foam Camping Bed w/Case for Adults & Kids - Folding...
  • Comfort & Convenience: The 4" floor mattress for sleep is made of a rich high-density foam. It is compressed for shipping but after 24 hours of...
  • Portability: The foldable mattress comes with a storage case that it easily fits inside. The travel case has built-in handles which makes it easy to...
  • Multipurpose: Too many guests and not enough beds? Need a stowaway bed while traveling? These portable beds for adults and kids solve all kinds of...
  • Certipur-US Certified: The portable mattress material is plush and breathable, making it convenient and comfortable but also strong enough to last. It...
  • Easy To Clean & Store: Because the tri folding mattress takes a compact form, it is easy to stow in closets, underneath beds, or in most nooks until...
Bestseller No. 3
Milliard Tri Folding Memory Foam Mattress with Washable Cover Twin XL (78 inches x 38 inches x 6...
  • The Milliard Memory Foam Tri-fold Mattress allows you to get a comfortable night's sleep wherever you go. Simply unfold the foam bed on the floor in...
  • Memory foam is known for the therapeutic qualities and comfortable support. The Milliard tri-fold mattress is ventilated for air flow to help regulate...
  • The Milliard Memory Foam Tri-fold Mattress is the ideal solution to temporary sleeping accommodations. Perfect for unexpected sleep over guests,...
  • The Milliard 6in. tri-fold mattress is constructed of 1.5in. of 3lb luxurious memory foam over a 4.5 inch supportive foam base for a great sleep...
  • Mattress includes removable jacquard ultra-soft bamboo cover with anti-slip bottom. Mattress in flat position measures 78in.x38in.x6in. When folded it...
Bestseller No. 4
Comfortable Memory Foam Camping Mattress Pad Twin - 75’’x 36’’x3’’ Waterproof Foldable...
  • WATERPROOF MEMORY FOAM ROLL OUT MATTRESS - If you are looking for camping mattresses, foldable mattress or a guest bed, the Hazli twin memory foam...
  • MOST COMFORTABLE MEMORY FOAM CAMPING MATTRESS – Made of superior memory foam, beautifully covered by a 100% waterproof machine washable cover, our...
  • VERSATILE AND LIGHTWEIGHT TWIN FOLDING MATTRESS - Our memory foam sleeping pad measures 75’’ Length, 36’’ Width and 3’’ Height. Great fit...
  • FOLDING FOAM MATTRES - This portable mattress is easy to fold and carry and has Velcro fasteners to fit more persons. FREE storage bag and packing...
  • 6 MONTHS NO QUESTIONS ASKED MONEY BACK GUARANTEE WHEN BUYING OUR MEMORY FOAM FLOOR MATRESS - We take extra care with our mats for sleeping on the...
Bestseller No. 5
Folding Mattress, Inofia Memory Foam Tri-fold Mattress with Ultra Soft Bamboo Cover, Non-Slip Bottom...
  • 【4 Inch Full Trifold Mattress】The foam camping mattress is equipped with ultra-soft bamboo cover. Inofia full portable mattress in flat position...
  • 【Compact Construction】Inofia 4inch tri-fold mattress is constructed of 1.5 inch memory foam over a 2.5 inch supportive foam base for a better...
  • 【Transportable Mattress】Inofia Memory Foam Foldable Mattress allows you to get a comfortable night's sleep wherever you go. Simply unfold the...
  • 【Temporary Sleeping Accommodation】Inofia folding mattress is the ideal solution to temporary sleeping accommodation, perfect for unexpected...
  • 【Inofia Guarantee】Inofia tri-fold mattress comes with 100 hassle-free night trial and 10-year warranty, please feel free to contact us if you have...
Bestseller No. 6
S SECRETLAND Folding Mattress, Portable Tri-fold Gel Memory Foam Mattress Topper with Washable...
  • 【Product Construction】S SECRETLAND 4 INCH SMALL TWIN size Folding Mattress features a 2-Layer Design: (1) 1" cooling-gel memory foam that fits...
  • 【Pressure Relief】The cooling-gel memory foam keeps you cool and reduce your body pressure all night, and the medium firm feel offers additional...
  • 【Versatile Mattress】The S SECRETLAND Memory Foam Tri-fold Mattress Topper is the ideal solution to temporary sleeping accommodations. Perfect for...
  • 【Easy To Clean】 :The zippered cover can be easily removed in seconds and is even machine washable. Simply zip it off, pop it in the washer and it...
  • 【Guarantee】S SECRETLAND tri-fold mattress comes with 30 hassle-free night trial and 10-year warranty.Allow up to 72 hours for the mattress to...
SaleBestseller No. 7
Cozzzi Folding Mattress - Trifold Foam Mattress Topper with Removable Cover -Lightweight and...
  • Comes in Handy in Any Situation: Our tri-fold mattress is a convenient & comfortable alternative to air mattresses. It folds and unfolds with little...
  • Soft and Airy Top Layer: This foldable mattress is made from high density foam which is known for its therapeutic benefits. It is super firm and...
  • Compact & Easy Travel bed: Your best companion while camping, a great floor bed solution or best full size sleeping place for 1 person in a travel...
  • Versatile Uses: This is perfect as guest sleeping place, a temporary bed, as a sleeping mat, for gym exercise, yoga or pilates. Most comfortable...
  • Easy to Clean: Machine Washable, simply zip off the cover and pop it in the washer. Use it as a ground mattress, 4 inch thick foam will keep you warm....
Bestseller No. 8
Molblly Folding Mattress,4.5 Inch Portable Tri Fold Twin XL Mattress Topper,Folding Memory Foam...
  • 【Comfortable Structure】 MOLBLLY 6-inch folding mattress adopts a double-layer design: (1) 1” gel memory foam, which fits the body perfectly and...
  • 【Convenience at Home】 MOLBLLY foldable folding mattress can be freely replaced on sofa, recliner and bed to meet your different needs. This...
  • 【Portable Multi-Function Mattress】 MOLBLLY tri-folding mattress is easy to fold and unfold, which is a good substitute for air mattress. Ideal for...
  • 【Comfortable and urable】 The cooling-gel memory foam keeps you cool and reduce your body pressure all night, and the medium firm feel offers...
  • 【Safe and Worry-Free】MOLBLLY tri-folding pad meets product standards: CertiPUR US and OEKO-TEX 100, which means it does not contain unhealthy...
Bestseller No. 9
Inofia Folding Mattress Full, 5-Inch Tri-fold Memory Foam Mattress, Foldable Mattress with Non-Slip...
  • 【Perfect Construction】Inofia tri-fold mattress is constructed of 5inch comfortable foam. The folding mattress includes a jacquard ultra-soft...
  • 【Multifunctional Folding Mattress】Portable foldable tri-folding mattresses are perfect for temporary guest sleeping beds, road trips, and camping....
  • 【Premium Quality】Memory foam foldable mattress design combined expertise and the best materials with advanced sleep technology. Memory foam of...
  • 【No Risk】The folding mattress with comfortable memory foam, it could ensure you with no concern sleeping. The ultra-soft fiber mattress cover has...
  • 【Ultimate Experience 】 We are a manufacturer specializing in designing and producing mattresses. We provide a 100-night risk-free comfort...
Bestseller No. 10
Portable Mattress - Folding Memory Foam Guest Fold Up Bed w/Case | Tri-Fold (6 Inch) Travel Away...
  • Comfy Queen Guest Mattress: Your Memory Foam Mattress folds out to give your guests a comfy Queen-sized floor mattress that supports without bottoming...
  • Tri-Fold Futon & Floor Mattress: Our space-saving Queen-sized mattress lets you avoid clunky futons; In 2 simple moves your Queen sized mattress sets...
  • Travel & Camp Mattress: Travelers use our camp mattress to stay warm and comfy on cold bumpy ground; The 60x80 inch size fits nicely into tents and...
Bestseller No. 11
Zinus Gel Memory Foam 5 Inch Tri-Fold Comfort Portable Folding Floor Mat, Single
  • Comfort and support from 1 inch gel memory foam, 2.5 inches viscolatex foam, 1.5 inches high-density base support foam
  • Twin: 39 inches, Narrow Twin: 30 inches, Cot Size: 27 inches wide
  • The Tri-Fold Comfort Mat is snugly packaged to efficiently arrive at your doorstep
  • Zinus gel memory foam is infused with natural ingredients to help absorb moisture, eliminate odors, and keep your mat fresh
  • Only the highest quality of foam - Foam is CertiPUR-US certified for durability, performance, and content
Bestseller No. 12
Molblly Folding Mattress 4 inch Tri-Fold Full Memory Foam Mattress Topper with Cooling Gel...
  • 【Comfortable Structure】 MOLBLLY 4-inch folding mattress adopts a double-layer design: (1) 1” gel memory foam, which fits the body perfectly and...
  • 【Convenience at Home】 MOLBLLY foldable folding mattress can be freely replaced on sofa, recliner and bed to meet your different needs. This...
  • 【Portable Multi-Function Mattress】 MOLBLLY tri-folding mattress is easy to fold and unfold, which is a good substitute for air mattress. Ideal for...
  • 【Comfortable and urable】 The cooling-gel memory foam keeps you cool and reduce your body pressure all night, and the medium firm feel offers...
  • 【Safe and Worry-Free】MOLBLLY tri-folding pad meets product standards: CertiPUR US and OEKO-TEX 100, which means it does not contain unhealthy...
Bestseller No. 13
Best Choice Products 4in Portable Mattress Folding Mattress Topper Full for Camping, Guest, Toddler,...
  • 4IN PLUSH FOAM: Soft yet firm foam provides maximum comfort and padding while protecting your mattress from dirt, pet fur, dead skin, and other...
  • MULTIPURPOSE: Great as a convenient guest bed, a comfy camping bed, or as a floor sofa during movie nights and gatherings with friends and family
  • PORTABLE AND SPACE-SAVING: Simply slip the included carrying case over the portable, tri-fold mattress and zip it up to keep it neat and secure while...
  • WASHABLE COVER: The removable cover is machine-washable and dryer-friendly for easy care and maintenance
  • EASY SETUP: Open package in well-ventilated area to release harmless odor that should dissipate within several hours. Wait 24-72 hours for maximum...
Bestseller No. 14
Willpo Memory Foam Camping Mattress for Kids - Portable Comfortable Floor Small Pad Outdoor Indoor...
  • 【GREAT SUPPORT & COMFORT】 High density foam has great resilience, grants you constant support, memory foam increase more wrapping feelings, brings...
  • 【SUPERIORLY WATERPROOF & NON-SLIP】 Removable waterproof sheet is machine-washable, also the high quality water-resistance zipper promotes the...
  • 【PORTABLE & MULTI-FUNCTION】The kids size (63"x26"x2.375") is easy to roll up into a compact size: 26.5"x13", weight 6.5lb. Comes with a travel...
  • 【SAFE & EASY TO CLEAN】All of foam are tested by Certipur-US, safer material, healthier life. Soft touch of cover cloth on the top. The zippered...
  • 【BETTER LIFESTYLE WITH FAMILY AND NATURE】Make the Memory Foam Camping Mattress be your favorite piece of camp gear to UNPLUG, UNWIND and spend...
Bestseller No. 15
Milliard Full Tri Folding Mattress with Washable Cover (73 inches x 52 inches x 4 inches)
  • Comfortable- This folding mattress is plush, soft, breathable, and super comfortable.
  • Portable- This mattress folds easily for travel or storage and is perfect for small apartments and tight spaces.
  • Convenient- The removable bamboo cover is machine washable for easy care.
  • Durable - Built to last and made of 4” thick luxe certified foam that won’t lose it’s shape.
  • Size- Open mattress measures 73”x52”x4”. Folded mattress measures 52”x24.5”x12”. Please ensure that this size fits your space correctly as...
Bestseller No. 16
Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Blue
  • Thickness: 4 inches (1 inch dura i-gel foam + 3 dura had support foam)
  • Complete with supportive memory foam topper providing soothing sleeping.
  • The ideal solution to temporary sleeping accommodations. Perfect portable topper for unexpected sleepover guests, dorm rooms, camping, and traveling.
  • Comfortable sense: no pain in the Back or neck when people sleep on it.
  • Smart package: our advanced compressed package technology delivers the topper in a box directly to your front door.
Bestseller No. 17
Milliard Tri-Fold Foam Folding Mattress and Sofa Bed for Guests (Full)
  • Simple, but elegant alternative when full-size sofa beds aren’t an option.
  • Great for apartment dwellers, college dorms, family dens and when your traveling or anywhere else space is limited.
  • Great for Video gaming, reading a book or camping and of course sleeping. Includes a removable and machine-washable soft cover!
  • Made of new and improved CertiPUR-US high density Foam so your bed dosn't sag and is light and portable enough for use while travelling.
  • Size: 76"x52"x4½ (Full). Storage Dimensions are 52"x29"x14 which makes it easy to store in tight spaces.
Bestseller No. 18
SINWEEK Folding Mattress with Storage Bag 4" Foldable Mattress Trifold Mattress Topper, CertiPUR-US...
  • The foldable design can effectively save space and is an ideal choice for small houses and narrow spaces. It provides a good and comfortable...
  • The lightweight and comfortable sponge material is not easy to deform, can provide maximum support and comfort, and give you a good sleeping...
  • The zipper design can easily and quickly remove the cover of the foldable foam mattress, which is conducive to cleaning and convenient for your...
  • The portable design allows you to enjoy a good time anytime, anywhere. It is a perfect solution for temporary sleep and is suitable for receiving...
  • SINWEEK fold mattress is consistent with the high standard of quality. We provide an honest 30-days money-back return policy. Please allow up to 72...
Bestseller No. 19
Milliard Premium Folding Mattress, Memory Foam Tri Fold with Waterproof Washable Cover, Queen Size...
  • The Milliard Deluxe Four Inch Memory Foam Folding Mattress combines comfort and convenience in one luxuriously soft sleep solution.
  • The three inch foam base is sturdy and built to last and the 1 inch memory foam top layer adds superior ergonomic comfort so you can have that perfect...
  • The strong and soft cover is removable and machine washable for easy care. An internal layer of high-tech waterproofing means you can sleep worry free...
  • Mattress measures 58 inches wide x 78 inches long x 4 inches thick. When in folded position mattress measures 25 inches x 25 inches x 12 inches.
  • All our foam is CertiPur certified and we make sure every product passes all relevant US regulations and of course our high standards. We stand behind...
SaleBestseller No. 20
Olee Sleep Tri-Folding Memory Foam Topper, 4 inch, Grey, Single size, Play Mat, Foldable bed, Guest...
  • Complete with supportive memory foam topper providing soothing sleeping or leisure.
  • Ideal solution to temporary sleeping accommodations, perfect for unexpected sleep over guests.
  • Portable and comfortable topper, support neck and back when people sleep on it.
  • Easily fold it up for storage in a closet in seconds when not in use.
  • Kindly refer to user manual provided under Technical Specification before use.

Having trouble finding a great Tri Fold Foam Camping Mattress?

This problem is well understood by us because we have gone through the entire Tri Fold Foam Camping Mattress research process ourselves, which is why we have put together a comprehensive list of the best Tri Fold Foam Camping Mattresss available in the market today.

After hours of searching and using all the models on the market, we have found the best Tri Fold Foam Camping Mattress for 2022. See our ranking below!

How Do You Buy The Best Tri Fold Foam Camping Mattress?

Do you get stressed out thinking about shopping for a great Tri Fold Foam Camping Mattress? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Tri Fold Foam Camping Mattress, which is why we have assembled a comprehensive list of the greatest Tri Fold Foam Camping Mattress available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Tri Fold Foam Camping Mattress that you consider buying. Your questions might include the following:

  • Is it worth buying an Tri Fold Foam Camping Mattress?
  • What benefits are there with buying an Tri Fold Foam Camping Mattress?
  • What factors deserve consideration when shopping for an effective Tri Fold Foam Camping Mattress?
  • Why is it crucial to invest in any Tri Fold Foam Camping Mattress, much less the best one?
  • Which Tri Fold Foam Camping Mattress are good in the current market?
  • Where can you find information like this about Tri Fold Foam Camping Mattress?

We’re convinced that you likely have far more questions than just these regarding Tri Fold Foam Camping Mattress, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Tri Fold Foam Camping Mattress, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Tri Fold Foam Camping Mattress. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Tri Fold Foam Camping Mattress buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Tri Fold Foam Camping Mattress currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Tri Fold Foam Camping Mattress has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Tri Fold Foam Camping Mattress?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Tri Fold Foam Camping Mattress.
  5. Customer Ratings: Number ratings grade Tri Fold Foam Camping Mattress objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Tri Fold Foam Camping Mattress.
  7. Product Quality: You don’t always get what you pay for with an Tri Fold Foam Camping Mattress, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Tri Fold Foam Camping Mattress is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Tri Fold Foam Camping Mattress information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Tri Fold Foam Camping Mattress is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: How to fold a mattress?

A: Bend it width-wise,not height-wise Keep the side of the mattress that you sleep on facing inside,so it doesn’t get dirty Make sure the top and bottom of the mattress base are touching Once folded,reinforce it with straps or ratchet tie-downs,so it doesn’t open

Q: What is a day bed?

A: Basic Knowledge About Daybeds. A daybed is a common piece of furniture that is sometimes otherwise called a sofa bed that allows you to lounge,sit,or lie on it. Standard Daybed Sizes. … Most Popular Daybed Sizes. …

Q: What is a mattress bed?

A: A mattress is a large, usually rectangular pad for supporting a lying person. It is designed to be used as a bed, or on a bed frame as part of a bed. Mattresses may consist of a quilted or similarly fastened case, usually of heavy cloth, containing materials such as hair, straw, cotton, foam rubber, or a framework of metal springs. Mattresses may also be filled with air or water.