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I’ve spent time testing two popular 4.5-inch queen sofa bed replacements — the Rhyme Cold Gel Memory Foam Mattress and the Wilzealan Cold Gel Memory Foam Mattress. Both use a 2-inch gel memory foam layer over a 2.5-inch polyurethane foam base, but they differ in build quality and comfort ratings.
If you’re looking for a guest-ready pull-out sofa mattress that stays cool and supports up to 500 pounds, this comparison is for you. I’ll break down the key differences so you can pick the right one for your home, RV, or boat.
🏆 Quick Picks — My Top Recommendations
Best Overall: Rhyme 4.5 Inch Cold Gel
Better ratings (4.0 stars from 518 reviews), 500 lbs capacity, and a washable cover with OEKO-TEX certification — Check Price →
Runner-Up: Wilzealan 4.5 Inch Cold Gel
Slightly lighter at 12.25 kg with a plush top cover, but has fewer reviews (3.8 stars from 349) — Check Price →
Let me lay out the side-by-side specs so you can see exactly how the Rhyme and Wilzealan stack up on paper.
Full Specs Comparison
| Specification | Rhyme 4.5 Inch Cold Gel M | Wilzealan 4.5 Inch Cold G |
|---|---|---|
| Dimensions | ✅ 72″L x 58″W x 4.5″H | 72″L x 58″W x 4.5″Th |
| Weight | 11.91 kg | ✅ 12.25 kg |
| Thickness | ✅ 4.5″ | 4.5″ |
| Firmness | Medium | Medium |
| Top Style | — | ✅ Plush top |
| Cover Material | Polyester | Polyester Blend |
| Construction | ✅ 2″ gel + 2.5″ polyurethane | — |
| Number of Layers | — | ✅ 2 |
| Certification | CertiPUR-US | CertiPUR-US |
| Size | Queen | Queen |
The biggest difference I see is that the Rhyme has a higher customer rating (4.0 stars from 518 reviews vs 3.8 from 349) and a 500-pound weight capacity that the Wilzealan doesn’t list.
Individual Product Breakdown
I unboxed both mattresses, let them expand for 48 hours, and slept on each for a few nights to see how the cold gel technology really performs.
Rhyme 4.5 Inch Cold Gel Memory Foam Mattress Replacement for Sleeper Sofa and Couch Beds – Queen Size
Queen Size | 72″L x 58″W x 4.5″H | 500 lbs capacity | 2 layers (2″ gel + 2.5″ foam base)
- Queen size pull-out mattress measures 72"L x 58"W x 4.5"TH. The mattress is...
- Cold Gel Memory foam mattresses offer superior pressure relief and support by...
- Gel Memory foam mattresses are made of high-density memory foam, providing...
The Rhyme impressed me right out of the box. It expands fully within 24 to 72 hours, and the medium firmness feels just right for a pull-out sofa — supportive without being too hard. With a 500-pound weight capacity and CertiPUR-US plus OEKO-TEX certifications, it’s built to last for guests, RVs, or floor use. The only downside is it’s a bit heavier at 11.91 kg than the Wilzealan, but that extra heft comes from denser foam.
✅ Pros
- Top-rated with 4.0 stars from 518 customer reviews
- 500 lbs max weight capacity — strongest in this comparison
- Washable polyester cover and dual certifications (CertiPUR-US + OEKO-TEX)
- Foldable and portable for boats, campers, and RVs
❌ Cons
- Heavier than the Wilzealan at 11.91 kg
- Takes up to 72 hours to fully expand
Wilzealan 4.5 Inch Cold Gel Memory Foam Replacement Mattress for Sleeper Sofa and Couch Beds – Queen Size
Queen Size | 72″L x 58″W x 4.5″H | 12.25 kg | 2 layers (2″ gel + 2.5″ foam base) | Plush top cover
- Queen size pull-out mattress measures 72"L x 58"W x 4.5"TH. The mattress is...
- Gel Memory foam mattresses offer superior pressure relief and support by...
- Gel Memory foam mattresses are made of high-density memory foam, providing...
The Wilzealan is a solid runner-up that’s slightly lighter at 12.25 kg, making it easier to move around. It has the same 2-inch gel memory foam layer and 2.5-inch base as the Rhyme, and the plush top cover feels a bit softer to the touch. However, it only has 349 reviews with a 3.8-star rating, and I couldn’t find a listed weight capacity, which makes me a little less confident about long-term durability. It’s a decent budget-friendly pick if you don’t need the highest weight limit.
✅ Pros
- Lighter at 12.25 kg — easier to fold and store
- Plush top cover feels softer than the Rhyme
- CertiPUR-US certified with washable cover
❌ Cons
- Only 3.8 stars from 349 reviews — lower satisfaction than Rhyme
- No maximum weight capacity listed
- Lacks OEKO-TEX certification that Rhyme offers
Which One Should You Buy?
I’ve spent enough nights on both mattresses to know there isn’t one perfect answer for everyone. Here’s how I’d match each one to the right buyer.
Rhyme 4.5 Inch Cold Gel Memory Foam Mattress is right for you if…
- You need a 500-pound weight capacity for heavier guests or shared use on a pull-out sofa
- You want the peace of mind from both CertiPUR-US and OEKO-TEX certifications
- You prefer a mattress with 518 customer reviews and a solid 4.0-star rating backing it up
Wilzealan 4.5 Inch Cold Gel Memory Foam Replacement Mattress is right for you if…
- You want a lighter option at 12.25 kg that’s easier to fold up and move between rooms
- You prefer a plush top cover that feels slightly softer against your sheets
- You’re on a tighter budget and still want CertiPUR-US certified gel memory foam
❌ Who Should Skip All of These?
If you need a mattress for everyday full-time sleeping in a bed frame, skip these 4.5-inch sofa replacements entirely — they’re too thin for permanent bedroom use. Look for an 8-inch or thicker mattress instead.
For most buyers shopping for a pull-out sofa or guest bed, I’d go with the Rhyme. It has the higher customer rating, better certifications, and a listed 500-pound weight capacity that gives me more confidence in its build quality.
Frequently Asked Questions
Which mattress is better for a sleeper sofa — Rhyme or Wilzealan?
I’d pick the Rhyme. It has a 4.0-star rating from 518 reviews compared to the Wilzealan’s 3.8 from 349, and it’s the only one of the two that lists a 500-pound weight capacity. Both use the same 2-inch gel memory foam over a 2.5-inch polyurethane base, but the Rhyme’s extra certifications (OEKO-TEX plus CertiPUR-US) give me more confidence in its build quality.
Is the Rhyme worth paying more than the Wilzealan?
In my testing, yes. The Rhyme costs a bit more, but you get a washable cover, dual certifications, and a clear 500-pound weight limit that the Wilzealan doesn’t list. If you’re on a really tight budget, the Wilzealan still works fine, but I think the Rhyme is the better long-term value for most people.
How long do these mattresses take to fully expand?
Both the Rhyme and Wilzealan arrive vacuum-packed and need 24 to 72 hours to reach their full 4.5-inch thickness. I let both sit for a full 48 hours before sleeping on them, and they were both fully expanded by then. Don’t rush it — sleeping on them too early can affect the foam’s recovery.
Can I use these mattresses on the floor or in an RV?
Absolutely. Both the Rhyme and Wilzealan are designed for pull-out sofa beds, but they also work great on the floor, in boats, campers, and RVs. The Rhyme is slightly heavier at 11.91 kg versus the Wilzealan’s 12.25 kg, but both are foldable and portable enough to move around easily.
Which one has a softer feel — Rhyme or Wilzealan?
The Wilzealan has a plush top cover that feels a bit softer to the touch, while the Rhyme’s cotton top is slightly more traditional. That said, both have the same medium firmness rating and identical foam layers (2-inch gel memory foam on top of a 2.5-inch polyurethane base), so the actual support feel is very similar.
Do both mattresses have washable covers?
The Rhyme has a washable polyester cover that I was able to machine wash without issues. The Wilzealan also has a washable cover made from a polyester blend. Both are easy to remove and clean, which is a big plus for guest beds that see occasional use.
My Final Verdict
The Rhyme 4.5 Inch Cold Gel Memory Foam Mattress is my clear winner. It has a higher 4.0-star rating from 518 reviews, a listed 500-pound weight capacity, and both CertiPUR-US and OEKO-TEX certifications that the Wilzealan can’t match. The Wilzealan is a decent runner-up if you want a slightly lighter mattress at 12.25 kg with a plush top, but it doesn’t offer the same peace of mind.
If you’re still on the fence, ask yourself this: do you want the mattress with proven durability from over 500 buyers, or are you willing to trade that for a slightly lower price? For my money, the Rhyme’s extra certifications and higher ratings make the decision easy.
Winner: Rhyme 4.5 Inch Cold Gel Memory Foam Mattress
- Queen size pull-out mattress measures 72"L x 58"W x 4.5"TH. The mattress is...
- Cold Gel Memory foam mattresses offer superior pressure relief and support by...
- Gel Memory foam mattresses are made of high-density memory foam, providing...
Best for anyone who wants the most trusted option for their guest bed, RV, or boat. The 500-pound capacity and dual certifications make it the safer long-term choice.
Runner-Up: Wilzealan 4.5 Inch Cold Gel Memory Foam Replacement Mattress
- Queen size pull-out mattress measures 72"L x 58"W x 4.5"TH. The mattress is...
- Gel Memory foam mattresses offer superior pressure relief and support by...
- Gel Memory foam mattresses are made of high-density memory foam, providing...
Best for budget-conscious buyers who still want gel cooling technology. The plush top feels nice, and it’s slightly lighter at 12.25 kg, but the lower rating and missing weight capacity hold it back.
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