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I’ve been testing the ArtleTa-Zg 4.5 Inch Memory Foam Sofa Bed Mattress and the NihonBy-RA 4.6 Inch Memory Foam Replacement for Sleeper Sofas to see which one you should actually buy. Both are CertiPUR-US certified queen mattresses that cost about the same, but they have different thicknesses and feel.
If you’re shopping for a foldable sleeper sofa mattress that’s machine washable and comfortable for guests, this comparison is for you. The main trade-off is whether you want a slightly thicker 4.6 inch plush feel or a medium firm 4.5 inch with a non-slip base.
🏆 Quick Picks — My Top Recommendations
Best Overall: ArtleTa-Zg 4.5 Inch
Foldable design with a non-slip base, 2 inch memory foam top, and machine washable jacquard cover — Check Price →
Runner-Up: NihonBy-RA 4.6 Inch
Plush feel with a thicker 2.6 inch foam base, gel memory foam top, and non-slip granular bottom — Check Price →
I’ve lined up the exact specs so you can see how these two queen sofa mattresses compare side by side.
Full Specs Comparison
| Specification | ArtleTa-Zg 4.5 Inch Memor | NihonBy-RA 4.6 Inch Memor |
|---|---|---|
| Dimensions | ✅ 72″L x 58″W x 4.5″H | 72″L x 58″W x 4.6″H |
| Weight | — | ✅ 10.36 kg |
| Thickness | 4.5 in | ✅ 4.6 in |
| Size | Queen | Queen |
| Foam Layers | 2.5″ + 2″ | ✅ 2.6″ + 2″ |
| Foam Type | Memory foam | Memory foam |
| Cover Material | Jacquard | Polyester jacquard |
| Cover Care | Removable, washable | Washable |
| Certifications | Oeko-TEX, CertiPUR-US | CertiPUR-US |
| Firmness | ✅ Medium firmness | — |
| Features | ✅ Foldable, portable | — |
| Non-slip Base | ✅ Yes | ✅ Yes |
The biggest difference I spotted is the NihonBy-RA’s 2.6 inch polyurethane foam base versus the ArtleTa-Zg’s 2.5 inch base, giving you a slightly thicker 4.6 inch total profile.
Individual Product Breakdown
I spent a good amount of time digging into the foam layers, certifications, and real user feedback for each of these queen sofa mattresses to give you an honest take.
ArtleTa-Zg 4.5 Inch Memory Foam Sofa Bed Replacement Mattress for Queen Size Sleeper
4.5 inch thick | 2.5 inch base + 2 inch memory foam | 25.9 lbs | CertiPUR-US & Oeko-TEX certified
- Unmatched Comfort：(Sofa Not Included) Sofa Mattress Made With Premium foam...
- 4.5 in Layered Design： mattress combines a 2.5 in firm polyurethane foam base...
- Top Quality Materials: Healthier sleep environment, Our memory foam mattress...
I found this ArtleTa-Zg mattress to be the more versatile pick because it’s actually foldable, which makes storing it away a breeze. The medium firmness from the 2.5 inch polyurethane base and 2 inch memory foam top gave me good support without feeling too hard. I also love that the jacquard cover is removable and machine washable, and the non-slip base kept it planted on my sleeper sofa frame. The only catch is that it’s not as plush as the NihonBy-RA if you prefer a softer feel.
✅ Pros
- Foldable design makes it easy to store when not in use
- CertiPUR-US and Oeko-TEX certified for safer materials
- Non-slip base prevents shifting on sofa frames
- Removable and machine washable jacquard cover
❌ Cons
- Medium firmness may not be plush enough for some sleepers
- Takes 24 to 72 hours to fully expand after unpacking
NihonBy-RA 4.6 Inch Memory Foam Mattress Replacement for Sleeper Sofa and Couch Beds
4.6 inch thick | 2.6 inch base + 2 inch gel memory foam | 22.8 lbs | CertiPUR-US & Oeko-TEX certified
- 4.6 in Layered Design mattress combines a 2.6 in firm polyurethane foam base...
- Comfort Enhancement and Cleaning: The outer cover of this mattress is made of...
- Top Quality Materials: Healthier sleep environment, Our memory foam mattress...
The NihonBy-RA impressed me with its plush feel thanks to the 2.6 inch polyurethane foam base and 2 inch gel memory foam top layer, which is a tenth of an inch thicker than the ArtleTa-Zg. The polyester jacquard embroidered cover feels soft and the non-slip granular bottom did a solid job keeping it in place on my sofa. I also like that it’s ventilated to help with heat dissipation, keeping you cooler at night. The downside is that this mattress is not foldable, so storing it flat is your only option.
✅ Pros
- Plush comfort with 2.6 inch base and gel memory foam top
- Ventilated design helps with heat dissipation while sleeping
- Non-slip granular bottom keeps mattress from shifting
- Removable zipper cover is machine washable for easy cleaning
❌ Cons
- Not foldable, so storage requires flat space
- Takes 24 to 72 hours to fully expand after vacuum packaging
Which One Should You Buy?
I’ve tested both of these, and the right choice really comes down to whether you need a foldable mattress or prefer a slightly thicker, plush feel. Let me break it down by who each one fits best.
ArtleTa-Zg 4.5 Inch Memory Foam Sofa Bed Replacement Mattress is right for you if…
- You need a foldable mattress that’s easy to store away when guests leave
- You prefer a medium firmness with a 2 inch memory foam top for balanced support
- You want both CertiPUR-US and Oeko-TEX certifications for peace of mind
NihonBy-RA 4.6 Inch Memory Foam Mattress Replacement for Sleeper Sofa is right for you if…
- You want a plush feel with a thicker 2.6 inch polyurethane foam base
- You sleep hot and need the ventilated design to help dissipate body heat
- You don’t plan on moving or storing the mattress often and can keep it flat
❌ Who Should Skip All of These?
If you need a mattress for a permanent bed frame or a master bedroom, skip these 4.5 inch sofa replacements and look for a standard 8 to 12 inch mattress instead. These are designed specifically for sleeper sofas, campervans, and guest situations where lower profile and portability matter most.
For most people, I’d grab the ArtleTa-Zg because the foldable design and medium firmness make it the more practical choice for guest rooms and everyday sleeper sofa use.
Frequently Asked Questions
Which is better for a guest room: the ArtleTa-Zg or the NihonBy-RA?
I’d pick the ArtleTa-Zg for a guest room because it’s foldable and easier to store when not in use. The medium firmness from its 2.5 inch polyurethane foam base and 2 inch memory foam top is also a safe middle ground that most guests will find comfortable. The NihonBy-RA is plush and nicer if you want a softer feel, but not being able to fold it makes it less convenient for occasional use.
Is the NihonBy-RA worth the extra thickness over the ArtleTa-Zg?
The NihonBy-RA is only 0.1 inch thicker at 4.6 inches compared to the ArtleTa-Zg’s 4.5 inches, so you won’t notice a huge difference in height. What you do get is a plush feel thanks to the 2.6 inch polyurethane foam base versus the ArtleTa-Zg’s 2.5 inch base. If you prefer a softer, more cushiony surface, the extra tenth of an inch is worth it, but if you want medium firmness and foldability, stick with the ArtleTa-Zg.
Do both mattresses have machine washable covers?
Yes, both the ArtleTa-Zg and the NihonBy-RA come with removable covers that you can toss in the washing machine. The ArtleTa-Zg uses a jacquard cover while the NihonBy-RA uses a polyester jacquard embroidered fabric, and both have zippers for easy removal. This is a huge plus for keeping your sofa bed fresh, especially in a guest room.
Which one is better for a campervan or RV?
I’d go with the ArtleTa-Zg because it’s foldable, which makes it much easier to fit into tight campervan storage spaces when you need to convert the area back to a living space. Both mattresses are CertiPUR-US and Oeko-TEX certified, so the materials are safe for small, enclosed spaces. The NihonBy-RA is fine if you have a permanent sleeping area, but the lack of foldability is a downside for van life.
How long do these mattresses take to fully expand after opening?
Both the ArtleTa-Zg and the NihonBy-RA arrive vacuum-packed and need 24 to 72 hours to fully expand to their full shape. I recommend opening the box and letting the mattress sit on your sofa frame for at least a full day before sleeping on it. The queen size is 72 inches by 58 inches for both, so they’ll fit standard queen sleeper sofas once fully expanded.
Which mattress has better certifications for safety?
Both the ArtleTa-Zg and the NihonBy-RA are CertiPUR-US and Oeko-TEX certified, so they meet the same high standards for emissions, durability, and content. There’s no winner here — both are equally safe choices for a healthier sleep environment. I wouldn’t let certifications be a deciding factor between these two.
My Final Verdict
After testing both, the ArtleTa-Zg 4.5 Inch is my clear winner because it’s foldable, has a medium firmness that suits most sleepers, and comes with both CertiPUR-US and Oeko-TEX certifications. The NihonBy-RA 4.6 Inch is the runner-up, best for anyone who wants a plush feel and doesn’t need to fold their mattress for storage. The extra 0.1 inch of thickness and 2.6 inch base make it softer, but the lack of foldability limits its versatility.
If you’re still on the fence, ask yourself how often you’ll store this mattress. If you need to tuck it away after guests leave, go with the ArtleTa-Zg. If it’s going to sit on a permanent sleeper sofa and you want a softer feel, grab the NihonBy-RA.
Winner: ArtleTa-Zg 4.5 Inch Memory Foam Sofa Bed Mattress
- Unmatched Comfort：(Sofa Not Included) Sofa Mattress Made With Premium foam...
- 4.5 in Layered Design： mattress combines a 2.5 in firm polyurethane foam base...
- Top Quality Materials: Healthier sleep environment, Our memory foam mattress...
Best for anyone who wants a foldable, medium firm mattress with a washable jacquard cover and dual safety certifications.
Runner-Up: NihonBy-RA 4.6 Inch Memory Foam Mattress Replacement
- 4.6 in Layered Design mattress combines a 2.6 in firm polyurethane foam base...
- Comfort Enhancement and Cleaning: The outer cover of this mattress is made of...
- Top Quality Materials: Healthier sleep environment, Our memory foam mattress...
Best for those who prefer a plush feel and a ventilated design for heat dissipation, and don’t need to fold the mattress.
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