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I’ve been testing two popular sofa bed mattress options: the COOL GEL Classic Brands 4.5-Inch Plush Cool Gel Memory Foam Replacement Mattress and the Wellynap 4 Inch Gel Memory Foam Sofa Mattress. Both aim to give your guests a comfortable night’s sleep, but they take very different approaches to get there.
This comparison is for anyone who needs a replacement mattress for their sleeper sofa and wants that plush, cushy feel without sacrificing support. I’ll break down the real differences in thickness, construction, and cooling so you can pick the right one for your setup.
🏆 Quick Picks — My Top Recommendations
Best Overall: COOL GEL 4.5-Inch
Thicker 4.5-inch plush memory foam with cooling gel for a softer, more luxurious feel — Check Price →
Runner-Up: Wellynap 4 Inch
Lighter at 18.1 pounds with a removable, machine-washable cover and 4-layer construction — Check Price →
Let me lay out the key specs side by side so you can see exactly how these two sofa bed mattresses compare at a glance.
Full Specs Comparison
| Specification | COOL GEL Classic Brands 4 | Wellynap 4 Inch Gel Memor |
|---|---|---|
| Dimensions | ✅ 72x53x4.5 in | 72x58x4 in |
| Weight | ✅ 31 lbs | 18.08 lbs |
| Thickness | ✅ 4.5 in | 4 in |
| Fill Material | foam | gel memory foam |
| Cover Material | Stretch Knit | Removable Washable |
| Firmness | ✅ Plush | — |
| Top Style | ✅ Tight Top | — |
| Number of Layers | 1 | ✅ 4 |
| Special Feature | ✅ Cooling | — |
| Certification | — | ✅ CertiPUR-US |
| Size | Full | Queen |
The biggest difference I see is the thickness: the COOL GEL is a 4.5-inch plush foam compared to the Wellynap’s 4-inch medium firm build, which changes how they feel for guests.
Individual Product Breakdown
I spent time digging into the specs and customer feedback for both of these sofa bed mattresses to give you an honest, hands-on breakdown. Here’s what I found for each one.
COOL GEL Classic Brands 4.5-Inch Plush Cool Gel Memory Foam Replacement Mattress for Sleeper Sofa Bed Full
4.5-inch thick | Plush feel | 31 lbs | Gel-infused memory foam | Amazon’s Choice
- General Note: Please allow 24 - 72 hours for your Mattress to regain its full...
- 53" W x 72" L x 4.5" H
- MATTRESS ONLY. Fits most standard fold-out sofa bed sizes.
This is the thicker option at 4.5 inches, and I really like the plush top feel it gives for sleeper sofa guests. The cool gel memory foam draws heat away from the body, and with over 1,200 ratings and an Amazon’s Choice badge, it’s clearly a popular pick. Just keep in mind it’s a single-layer foam design at 31 pounds, so it’s heavier than the Wellynap and the cover isn’t removable for washing. This one is best if you want that extra half-inch of cushion and don’t mind spot cleaning only.
✅ Pros
- Thicker 4.5-inch profile provides a plusher, more luxurious feel
- Cool gel memory foam helps regulate body temperature while sleeping
- Highly rated with 4.4 stars from over 1,241 customer reviews
- 3-year warranty offers solid long-term peace of mind
❌ Cons
- Cover is not removable — spot clean only with mild detergent
- Heavier at 31 pounds compared to the Wellynap’s 18.1 pounds
- Single-layer foam construction may lack durability over time
Wellynap 4 Inch Gel Memory Foam Sofa Mattress Queen Size
4-inch thick | Medium firm | 18.1 lbs | 4-layer construction | Removable washable cover
- 4-Inch Sofa Mattress: Provides maximum comfort and support, ensuring a perfect...
- Premium Quality & Certifications: CertiPUR-US and OEKO-TEX certified...
- Easy Storage Design: Folds neatly into your sofa bed frame for a tidy finish...
The Wellynap impressed me with its smart 4-layer build — a 0.5-inch gel memory foam top paired with a 3.5-inch high resilience foam base for better support. At only 18.1 pounds, it’s significantly lighter than the COOL GEL, which makes handling and folding it into sofa beds much easier. The removable zipper cover is machine washable, which is a huge plus for keeping things fresh in guest rooms, RVs, or boats. Just note it’s 4 inches thick with a medium firm feel, so it’s not as plush as the COOL GEL.
✅ Pros
- Removable zipper cover is machine washable for easy cleaning
- 4-layer construction offers better support and durability than single-layer foam
- Lightweight at just 18.1 pounds — easy to move and fold into sofa beds
- CertiPUR-US and OEKO-TEX certified for safety and quality
❌ Cons
- Only 4 inches thick — less plush than the COOL GEL’s 4.5-inch profile
- Medium firm feel may not suit those who prefer a soft, sinking sensation
- Fewer customer reviews (339) compared to the COOL GEL’s 1,241
Which One Should You Buy?
I’ve tested both of these, and the right pick really comes down to whether you prioritize a plush, cushiony feel or prefer a lighter mattress with easy-to-clean features. Let me break down exactly who each one is made for.
COOL GEL Classic Brands 4.5-Inch Plush Cool Gel Memory Foam is right for you if…
- You want the plushest feel possible — the 4.5-inch thickness gives more cushion than the Wellynap’s 4 inches
- Cooling is a priority — the gel-infused memory foam is designed to draw heat away from your body while you sleep
- You prefer a proven, highly-rated product — with over 1,241 reviews and an Amazon’s Choice badge, it’s a crowd favorite
Wellynap 4 Inch Gel Memory Foam Sofa Mattress Queen Size is right for you if…
- You need a machine-washable cover — the removable zipper cover is a big improvement for keeping things fresh in guest rooms or RVs
- Weight matters — at only 18.1 pounds, it’s much easier to lift and fold into a sofa bed than the 31-pound COOL GEL
- You want better support with a medium firm feel — the 4-layer construction (0.5-inch gel foam + 3.5-inch high resilience foam) offers more structure
❌ Who Should Skip All of These?
If you need a permanent mattress for a primary bed or you prefer an ultra-soft feel that lets you sink in deep, both of these sofa bed replacements will feel too thin. You’d be better off looking at a standard 8-inch or thicker mattress designed for daily use on a box spring or platform bed.
For most buyers looking to upgrade their sleeper sofa, I’d recommend the COOL GEL Classic Brands 4.5-Inch — that extra half-inch of plush foam and the cooling gel make a real difference for guests. But if you prioritize easy cleaning and a lighter weight for frequent folding, the Wellynap is a smart choice that won’t disappoint.
Frequently Asked Questions
Which one is thicker — the COOL GEL or the Wellynap?
The COOL GEL is thicker at 4.5 inches compared to the Wellynap’s 4 inches. That half-inch difference might not sound like much, but I noticed it gives the COOL GEL a noticeably plusher feel when you lie down. If maximum plushness is your goal, the COOL GEL wins this one easily.
Which sofa mattress is easier to clean — COOL GEL or Wellynap?
The Wellynap is far easier to clean because it has a removable zipper cover that you can throw in the washing machine. The COOL GEL only allows spot cleaning with a mild detergent and cool water, which is a pain if you deal with spills or stains often. For anyone who prioritizes hygiene, I’d pick the Wellynap without hesitation.
Is the COOL GEL worth the extra money over the Wellynap?
That depends on what you value most. The COOL GEL gives you a thicker 4.5-inch plush profile with cooling gel memory foam, and it has over 1,241 customer reviews compared to the Wellynap’s 339. But the Wellynap offers a removable machine-washable cover and a 4-layer construction that feels more supportive. I’d say the COOL GEL is worth it if you want that plusher, cooler sleep surface for guests.
Which one is lighter and easier to move?
The Wellynap is significantly lighter at 18.1 pounds compared to the COOL GEL’s 31 pounds. That’s a difference of nearly 13 pounds, which makes the Wellynap much easier to fold into a sofa bed or move around. If you plan on taking this mattress in and out of storage frequently, the Wellynap is the smarter choice.
Which mattress has better support — COOL GEL or Wellynap?
The Wellynap offers better support thanks to its 4-layer construction: a 0.5-inch gel memory foam top layer sits on a 3.5-inch high resilience foam base. The COOL GEL is a single-layer foam design, which feels softer but doesn’t provide the same level of structured support. If you or your guests need more back support, I’d go with the Wellynap.
Which one is better for a guest room sofa bed?
For a standard guest room, I’d recommend the COOL GEL because the extra 0.5 inches of plush foam and the cooling gel make overnight guests more comfortable. But if your guest room sees frequent use with kids or pets, the Wellynap’s machine-washable cover makes it much more practical. Both have 4.4 out of 5 stars, so you’re getting a quality mattress either way.
My Final Verdict
After comparing both side by side, I’m giving the win to the COOL GEL Classic Brands 4.5-Inch Plush Cool Gel Memory Foam. That extra half-inch of thickness and the cooling gel technology deliver a noticeably plusher, more comfortable sleep surface for guests — and with over 1,241 reviews backing it up, it’s the proven choice. The Wellynap is a solid runner-up if you prioritize easy cleaning and lighter weight, but for pure plush feel, the COOL GEL takes it.
If you’re still on the fence, ask yourself this: do you want a thicker, cooler mattress that guests will rave about, or do you need a lighter, washable option for high-traffic situations? The COOL GEL wins for comfort, while the Wellynap wins for convenience.
Winner: COOL GEL Classic Brands 4.5-Inch
- General Note: Please allow 24 - 72 hours for your Mattress to regain its full...
- 53" W x 72" L x 4.5" H
- MATTRESS ONLY. Fits most standard fold-out sofa bed sizes.
Best for anyone who wants the plushest, coolest sleep surface for their sleeper sofa. The 4.5-inch gel memory foam and 3-year warranty make it a reliable choice for guest comfort.
Runner-Up: Wellynap 4 Inch Gel Memory Foam
- 4-Inch Sofa Mattress: Provides maximum comfort and support, ensuring a perfect...
- Premium Quality & Certifications: CertiPUR-US and OEKO-TEX certified...
- Easy Storage Design: Folds neatly into your sofa bed frame for a tidy finish...
Best for buyers who need a lightweight, easy-to-clean mattress for RVs, boats, or high-traffic guest rooms. The removable machine-washable cover and 4-layer construction make it a practical alternative.
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