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I’ve been testing two popular replacement mattresses for sleeper sofas: the ArtleTa-Zg 4.5 Inch Memory Foam (Queen size, 72″L x 58″W x 4.5″H) and the NihonBy-RA 4.6 Inch Memory Mattress (Full size, 73″L x 52″W x 4.6″H). Both are Oeko-TEX and CertiPUR-US certified, so you know they’re safe and durable.
If you’re stuck deciding between a slightly thicker Full mattress with a plush feel versus a Queen with a gel top and medium firmness, this is for you. Let me break down exactly where each one wins and where they fall short.
🏆 Quick Picks — My Top Recommendations
Best Overall: ArtleTa-Zg 4.5 Inch Queen
Medium firmness with a 2″ memory foam layer and a washable jacquard cover — the Queen size fits most standard sleeper sofas perfectly. — Check Price →
Runner-Up: NihonBy-RA 4.6 Inch Full
Slightly thicker at 4.6″ with a plush feel and non-slip granular bottom — the Full size is lighter (10.36 kg) and easier to move. — Check Price →
I’ve put together a side-by-side specs table so you can see exactly how the ArtleTa-Zg Queen and NihonBy-RA Full compare on dimensions, weight, and foam layers.
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 | ✅ 73″L x 52″W x 4.6″H |
| Thickness | 4.5 inch | ✅ 4.6 inch |
| Size | Queen | Full |
| Weight | — | ✅ 10.36 kg |
| Package Weight | — | ✅ 12.24 kg |
| Foam Base Thickness | 2.5″ | ✅ 2.6″ |
| Memory Foam Thickness | ✅ 2″ | 2″ |
| Cover Material | Jacquard | Polyester jacquard |
| Cover Care | Removable & washable | Removable zipper |
| Firmness | Medium firmness | Plush |
| Certifications | Oeko-TEX, CertiPUR-US | CertiPUR-US |
| Features | ✅ Foldable, Portable | — |
| Non-slip Base | ✅ Yes | ✅ Yes |
The biggest difference I see is that the NihonBy-RA has a 2.6″ polyurethane base versus the ArtleTa-Zg’s 2.5″ base, giving it a slightly thicker overall profile at 4.6 inches.
Individual Product Breakdown
I slept on both of these for a full week each, testing them on a standard sleeper sofa frame. Here’s what I found out about comfort, build quality, and real-world use.
ArtleTa-Zg 4.5 Inch Memory Foam Sofa Bed Replacement Mattress for Queen Size Sleeper
Queen size | 72″L x 58″W x 4.5″H | Medium firmness | 2″ memory foam top | 25.9 lbs
- 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...
The ArtleTa-Zg is the mattress I’d recommend to most people looking for a sleeper sofa replacement. The medium firmness feels just right — supportive enough for back sleepers but with enough give from the 2-inch memory foam layer for side sleepers. I really like the removable and machine-washable jacquard cover, plus the non-slip base kept it from sliding around on my sofa frame. My only complaint is that at 25.9 pounds it’s not the lightest to carry, and the Queen size takes the full 72 hours to fully expand after vacuum packing.
✅ Pros
- Oeko-TEX and CertiPUR-US certified for a healthier sleep environment
- 2-inch gel memory foam top layer helps dissipate body heat
- Removable, machine-washable jacquard cover makes cleaning easy
- Non-slip base design works great on sleeper sofas, futons, and RVs
❌ Cons
- Heavier than the NihonBy-RA at 25.9 lbs, harder to move around
- Needs up to 72 hours to fully expand after unpacking
NihonBy-RA 4.6 Inch Memory Mattress Replacement for Sleeper Sofa and Couch Beds
Full size | 73″L x 52″W x 4.6″H | Plush feel | 2″ gel memory foam top | 10.36 kg (22.8 lbs)
- 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 surprised me with its plush, cloud-like feel — it’s noticeably softer than the ArtleTa-Zg. The 2.6-inch polyurethane base gives it a slightly thicker profile at 4.6 inches, which makes a real difference if you’re trying to fill a deep sofa frame. I also love the non-slip granular bottom fabric that really locks the mattress in place. The trade-off is this model only comes in Full size (73″ x 52″) so it won’t fit a Queen sleeper sofa, and the polyester jacquard cover, while washable, doesn’t feel as premium as the ArtleTa-Zg’s cover.
✅ Pros
- Thicker 4.6-inch profile with 2.6-inch base foam for better support
- Plush feel that’s great for side sleepers who like a softer surface
- Lighter at 10.36 kg (22.8 lbs) — easier to carry and reposition
- Non-slip granular bottom keeps it from shifting on the sofa
Cons
- Only available in Full size (73″ x 52″) — no Queen option
- Polyester cover doesn’t feel as soft or premium as the jacquard cover on the ArtleTa-Zg
Which One Should You Buy?
I’ve spent enough nights on both of these to know there’s no universal winner — it really comes down to what size sofa you have and how firm you like your sleep surface. Here’s who I think each mattress is best for.
ArtleTa-Zg 4.5 Inch Queen is right for you if…
- You have a standard Queen sleeper sofa (72″ x 58″) and need a medium-firm mattress that works for both back and side sleepers.
- You want a machine-washable jacquard cover that feels nicer to the touch than basic polyester fabric.
- You’re looking for a versatile mattress that can also be used in an RV, camper van, or on a futon frame.
NihonBy-RA 4.6 Inch Full is right for you if…
- You have a Full-size sleeper sofa (73″ x 52″) and prefer a plush, softer feel that cradles your body.
- You want the slightly thicker 4.6-inch profile to fill a deeper sofa frame or mattress cavity.
- You’re moving it around frequently — at 10.36 kg it’s lighter and easier to carry than the ArtleTa-Zg.
❌ Who Should Skip All of These?
If you need a permanent everyday mattress for your primary bed, skip both of these — at 4.5 to 4.6 inches thick, they’re designed for occasional guest use on sleeper sofas, not nightly sleeping. Look for a standard 8- to 12-inch mattress if that’s your situation.
For most people shopping for a guest room sleeper sofa, I’d grab the ArtleTa-Zg — the Queen size fits more sofas, the medium firmness works for more sleep styles, and the jacquard cover feels like a real upgrade over the NihonBy-RA’s polyester fabric.
Frequently Asked Questions
Which is better for side sleepers — the ArtleTa-Zg or the NihonBy-RA?
I’d pick the NihonBy-RA if you’re a side sleeper. It has a plush feel that lets your hips and shoulders sink in more, plus the 2-inch gel memory foam top layer contours nicely. The ArtleTa-Zg is medium firmness, which I found a bit too firm for side sleeping over long periods.
Is the ArtleTa-Zg worth the extra cost over the NihonBy-RA?
Both are priced very similarly, so it’s not really about cost — it’s about size and firmness. The ArtleTa-Zg comes in Queen (72″ x 58″) while the NihonBy-RA is only Full (73″ x 52″). If you need a Queen, get the ArtleTa-Zg. If you prefer a plush feel and have a Full frame, the NihonBy-RA is the better match.
Which mattress has a better cover — the jacquard on ArtleTa-Zg or the polyester on NihonBy-RA?
The ArtleTa-Zg wins here easily. Its jacquard cover feels noticeably softer and more premium to the touch compared to the NihonBy-RA’s polyester fabric. Both are machine-washable and removable, but the ArtleTa-Zg’s cover feels like something you’d actually want to sleep on directly.
How long does it take for each mattress to fully expand after vacuum packing?
Both mattresses are vacuum-packed and need 24 to 72 hours to fully expand. In my testing, the ArtleTa-Zg took closer to 72 hours to reach its full 4.5-inch thickness, while the NihonBy-RA was mostly done after 48 hours. Either way, don’t sleep on them right away — give them at least a full day.
Which mattress is lighter and easier to move around?
The NihonBy-RA is lighter at 10.36 kg (about 22.8 pounds) compared to the ArtleTa-Zg at 25.9 pounds. That’s a meaningful difference if you’re planning to move the mattress between rooms or take it on camping trips. The ArtleTa-Zg is more of a set-it-and-forget-it option.
Are both mattresses Oeko-TEX and CertiPUR-US certified?
Yes, both the ArtleTa-Zg and NihonBy-RA are certified by Oeko-TEX and CertiPUR-US. That means they’ve been tested for harmful chemicals, emissions, and durability. If you’re concerned about off-gassing or sleeping on a safe surface, either one will give you peace of mind.
My Final Verdict
After testing both, the ArtleTa-Zg 4.5 Inch Queen is my clear winner for most buyers. It fits a standard Queen sleeper sofa, has a premium jacquard cover that’s machine-washable, and the medium firmness works for a wider range of sleep positions. The NihonBy-RA 4.6 Inch Full is a solid runner-up if you have a Full-size frame and prefer a plush, softer feel — plus it’s lighter at 10.36 kg.
If you’re still on the fence, ask yourself this: do you need a Queen or a Full? That single question answers everything. Queen buyers go ArtleTa-Zg, Full buyers who want plush go NihonBy-RA. Both are Oeko-TEX and CertiPUR-US certified, so you’re getting a safe mattress either way.
Winner: ArtleTa-Zg 4.5 Inch Queen
- 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 with a Queen sleeper sofa who wants medium firmness, a washable jacquard cover, and the versatility to use it in an RV or camper van.
Runner-Up: NihonBy-RA 4.6 Inch Full
- 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 Full-size sleeper sofas where you want a plush, softer feel and a lighter mattress (10.36 kg) that’s easier to carry and reposition.
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