King Size Futon Mattress: 3 Floor Mattresses

As an Amazon Associate I earn from qualifying purchases. Links marked “Affiliate link” may earn us a commission at no extra cost to you. Learn more.

Quick answer

Three king size futon mattress options are compared here by their listed size, and the sections below use each product’s own listing data. MAXYOYO Japanese Floor Mattress 4″ Thick lists 80″ L × 78″ W; ZonLi Japanese Floor Mattress Futon Mattress lists 80″ L × 76″ W; Extra Thick Futon Mattress lists 80″ L × 60″ W. By listed floor footprint, Extra Thick Futon Mattress is the smallest (33.33 sq ft) and MAXYOYO Japanese Floor Mattress 4″ Thick the largest (43.33 sq ft). Specifications come from Amazon listing data checked October 3, 2026; we have not tested these products. Recheck the selected variant and the current price on Amazon before ordering, because titles and specification fields can change.

Quick compare: the products in this guide

Sizes come from the Amazon listings as we read them; check the product page for the current details before you buy.

Product	Listed details	Link
MAXYOYO Japanese Floor Mattress 4″ Thick King Size Foldable Futon Mattress	King; material type Foam, High-density Base Support Foam, High-density Foam, Polyester	See details on Amazon Affiliate link
ZonLi Japanese Floor Mattress Futon Mattress King Size 6 Inch Thick	King (80″L x 76″W x 6″Th); material type Polyester	See details on Amazon Affiliate link
Extra Thick Futon Mattress – Japanese Floor Mattress for Adults, Portable…	Queen; material type Foam	See details on Amazon Affiliate link

Three options at a glance

Pick	Listed dimensions	Floor footprint	Footprint rank
MAXYOYO Japanese Floor Mattress 4″ Thick	80″ L × 78″ W	6240 sq in (43.33 sq ft)	Largest
ZonLi Japanese Floor Mattress Futon Mattress	80″ L × 76″ W	6080 sq in (42.22 sq ft)	Middle
Extra Thick Futon Mattress	80″ L × 60″ W	4800 sq in (33.33 sq ft)	Smallest

1. MAXYOYO Japanese Floor Mattress 4″ Thick King Size Foldable Futon Mattress — Largest listed footprint

Listed details: dimensions 80″ L × 78″ W; item weight 22 pounds; material Foam, High-density Base Support Foam, High-density Foam, Polyester; color Black.

The MAXYOYO is a 4 inch thick foldable Japanese floor mattress in black, listed as king size at 78 inches wide by 80 inches long, which is 43.33 square feet. The cover is polyester and the fill is polyester with a high-density base support foam layer in the middle. The item weight is 22 pounds. The listing asks you to dry the mattress in the sun first so it recovers faster after compressed shipping. The package is said to include one same-color dustproof cover, one pair of bandages and one storage bag. The listing does not state a firmness rating or a weight capacity.

Pros

• Listed as king size, 78 × 80 inches, and the widest of the three
• Dustproof cover, a pair of bandages and a storage bag are listed in the package
• High-density base support foam in the middle layer, per the listing

Cons

• Largest footprint at 43.33 sq ft, so it needs a lot of floor when unrolled
• Only 4 inches thick, the thinnest of the two that state a thickness
• The listing says to sun-dry it first because it ships compressed, so it is not ready right away

Who it is for / who should skip it: Pick it if you want a true king-width mat with a cover and storage bag included. Skip it if you want a thicker mattress or need it ready to use right away.

2. ZonLi Japanese Floor Mattress Futon Mattress King Size 6 Inch Thick — Middle listed footprint

Listed details: dimensions 80″ L × 76″ W; item weight 16 ounces; material Polyester; color Black.

The ZonLi is a 6 inch thick Japanese floor mattress in black polyester, listed as king size at 76 inches wide by 80 inches long, a 42.22 square foot footprint. The listing says it can be used as a topper, a bedroom or living room futon, a tatami mat, a guest sleeping mat or a yoga mat. The item weight is listed as 16 ounces, which looks low for a 6 inch thick king mattress, so verify it. The bullets say that the compressed package regains its thickness in 2-3 days and that you can sun-dry it or use a futon dryer. No weight capacity is stated.

Pros

• Thickest of the three at 6 inches, for a fuller cushioned feel
• Listed as usable as a topper, floor mattress, guest mat or tatami mat
• Regains thickness in 2-3 days after compressed shipping, per the listing

Cons

• The 16 ounce item weight looks too low for a 6 inch king mattress, so verify it
• Listed 76 inch width is narrower than the MAXYOYO’s 78 inches
• No fill description beyond polyester, and no weight capacity is stated

Who it is for / who should skip it: Pick it if you want the thickest option and a multi-use mat that regains shape within days. Skip it if you need a confirmed weight or a detailed fill spec.

3. Extra Thick Futon Mattress – Japanese Floor Mattress for Adults, Portable Foldable Sleeping Pad for Guest, Camping, Dorm,Futon Mattress Queen Size with Storage Straps, Black — Smallest listed footprint

Listed details: dimensions 80″ L × 60″ W; item weight 18 pounds; material Foam; color Black.

This listing is an extra thick foldable Japanese floor mattress in black foam, for adults, guests and camping. The dimensions are 80 inches long by 60 inches wide, a 33.33 square foot footprint, the smallest of the three. The title does not say king size, and 60 inches is 18 inches narrower than the MAXYOYO’s 78 inches and 16 inches narrower than the ZonLi’s 76 inches. The item weight is 18 pounds. The bullets say the bottom has 3D silicone anti-slip particles, that it rolls up for storage and that it is vacuum compressed for shipping. The listing does not state a thickness.

Pros

• Smallest footprint at 80 × 60 inches (33.33 sq ft)
• 3D silicone anti-slip particles on the bottom, per the listing
• Portable, rolls up when not in use, and weighs 18 pounds

Cons

• At 60 inches wide it is not king width by the other two listings’ numbers
• The listing does not state a thickness
• The title does not say king size, so the keyword does not match this product

Who it is for / who should skip it: Pick it if you need a narrower floor mattress for one sleeper or camping and the non-slip base matters. Skip it if you want a king-width bed.

What to check before buying king size futon mattress

Start with the real width, because king size is the whole point of the keyword. The MAXYOYO lists 78 inches wide by 80 inches long (43.33 sq ft). The ZonLi lists 76 by 80 inches (42.22 sq ft). The third lists 60 by 80 inches (33.33 sq ft) and its title does not say king size, so it does not match the keyword.

Second, compare thickness. The ZonLi lists 6 inches and the MAXYOYO lists 4 inches. The third listing does not state a thickness. A thicker mat feels more cushioned on a hard floor but is bulkier to fold and store.

Third, check the fill. The MAXYOYO lists a polyester cover, polyester fill and a middle layer of high-density base support foam. The third lists foam. The ZonLi lists polyester only.

Fourth, read the weight. The MAXYOYO is 22 pounds and the third is 18 pounds. The ZonLi lists 16 ounces, which looks too low for a 6 inch king mattress, so verify it before you plan how to carry it.

Fifth, check what arrives. The MAXYOYO lists a dustproof cover, a pair of bandages and a storage bag. The third lists a 3D silicone anti-slip bottom. The ZonLi lists nothing extra in the text provided.

Sixth, plan for recovery time. The MAXYOYO says to sun-dry it first, and the ZonLi says it regains thickness in 2-3 days. The third is vacuum compressed.

Decision rules: choose the MAXYOYO for the widest mat and the included cover and bag. Choose the ZonLi for the thickest cushioning if you accept the unclear weight. Choose the third only if 60 inches is wide enough. None lists a weight capacity.

Worked example: fit math for these three options

This worked example is our own planning arithmetic from the listed dimensions, not test results. The wall length and walkway width are assumed example values; replace them with your measurements.

Wall example. Assume 96 inches of clear wall.

• MAXYOYO Japanese Floor Mattress 4″ Thick: 96 − 78 = 18 inches spare; centred, 9 inches on each side before trim, plugs or curtains.
• ZonLi Japanese Floor Mattress Futon Mattress: 96 − 76 = 20 inches spare; centred, 10 inches on each side before trim, plugs or curtains.
• Extra Thick Futon Mattress: 96 − 60 = 36 inches spare; centred, 18 inches on each side before trim, plugs or curtains.

Walkway example. The US Access Board gives 36 inches as the minimum clear width for an accessible route. That figure is a yardstick, not a rule for private homes. To keep 36 inches clear beside each product, the walkway between it and the opposite obstacle must be at least 36 inches plus its depth:

• MAXYOYO Japanese Floor Mattress 4″ Thick: 36 + 80 = 116 inches of total path width.
• ZonLi Japanese Floor Mattress Futon Mattress: 36 + 80 = 116 inches of total path width.
• Extra Thick Futon Mattress: 36 + 80 = 116 inches of total path width.

Footprint. Depth × width, converted at 144 square inches per square foot:

• MAXYOYO Japanese Floor Mattress 4″ Thick: 80 × 78 = 6240 sq in, or 43.33 sq ft.
• ZonLi Japanese Floor Mattress Futon Mattress: 80 × 76 = 6080 sq in, or 42.22 sq ft.
• Extra Thick Futon Mattress: 80 × 60 = 4800 sq in, or 33.33 sq ft.

Mistakes to avoid

• Assuming every listing is king width. The third mattress is 60 inches wide and its title does not say king. The MAXYOYO lists 78 and the ZonLi 76 inches.
• Trusting the 16 ounce weight. The ZonLi lists 16 ounces for a 6 inch king mattress, which looks wrong. Verify it before relying on it.
• Using it straight from the box. Compressed mattresses need time to expand. The MAXYOYO asks for sun-drying and the ZonLi says 2-3 days.
• Expecting a thickness figure everywhere. The third listing does not state one, so you cannot compare its cushioning.

Related guides

• what size desk for a small room
• best cube storage organizers for small rooms
• best narrow console tables for small entryways

Frequently asked questions

Which one is actually king width?

The MAXYOYO is listed as king size at 78 inches wide by 80 inches long, and the ZonLi is listed as king size at 76 by 80 inches. The third is 60 by 80 inches and its title does not say king size.

How thick are they?

The ZonLi is listed at 6 inches and the MAXYOYO at 4 inches. The third listing does not state a thickness, so ask the seller if cushioning matters to you.

How long until it is ready to use?

The ZonLi says the compressed package regains its thickness in 2-3 days. The MAXYOYO asks you to dry it in the sun first so it recovers faster. The third is vacuum compressed and its text does not give a recovery time.

What comes in the box?

The MAXYOYO lists one same-color dustproof cover, one pair of bandages and one storage bag. The ZonLi and the third listing do not list extras in the text provided, though the third has an anti-slip silicone bottom.

Products worth checking

We have not tested these products. Sizes and features come from the Amazon listings as we read them; where a listing does not say, we say so.

Sources checked

• US Access Board guide to clear width
• Amazon listing for MAXYOYO Japanese Floor Mattress 4″ Thick King Size Foldable Futon Mattress
• Amazon listing for ZonLi Japanese Floor Mattress Futon Mattress King Size 6 Inch Thick
• Amazon listing for Extra Thick Futon Mattress – Japanese Floor Mattress for Adults, Portable Foldable Sleeping Pad for Guest, Camping, Dorm,Futon Mattress Queen Size with Storage Straps, Black

Specifications come from the Amazon listings as we read them for this guide. Product details and availability can change, so confirm on the product page before you buy.

How we research our guides