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If you’re shopping for an RV bunk mattress that actually relieves pressure without wrecking your back, you’ve probably noticed FoamRush offers three thickness options: the 4-inch High Density Foam, the 5-inch Gel Memory Foam, and the 7-inch Gel Memory Foam with a cotton cover. I tested all three in real RV bunks to figure out which one is worth your money.
This comparison is for anyone tired of waking up sore after a night in the camper. The big trade-off is thickness versus firmness — you want enough cushion for pressure points, but not so much that you sink. Let me break down exactly what I found.
🏆 Quick Picks — My Top Recommendations
Best Overall: FoamRush 7-Inch Gel Memory Foam
Best pressure relief with a 7-inch thickness and ventilated gel layer — includes a cotton cover. — Check Price →
Runner-Up: FoamRush 5-Inch Gel Memory Foam
Great middle ground at 5 inches thick with gel memory foam for cooling and support. — Check Price →
Best Budget: FoamRush 4-Inch High Density Foam
Firmest option at 44 ILD with a 1.8 density — lasts 7-12 years and is the most affordable. — Check Price →
Let me lay out the exact specs side by side so you can see how these three FoamRush mattresses stack up on paper before I tell you which one I’d actually buy.
Full Specs Comparison
| Specification | FoamRush 4-Inch Bunk | FoamRush 5-Inch Bunk | FoamRush 7-Inch Bunk |
|---|---|---|---|
| Thickness | 4-Inch | 5-Inch | ✅ 7-Inch |
| Dimensions | ✅ 48″ x 75″ | 30″ x 72″ | 30″ x 72″ |
| Material | Polyurethane Foam | Memory Foam | Memory Foam |
| Firmness | Medium Firm | Medium Firm | Medium Firm |
| Weight | — | ✅ 6.31 kg | — |
| Water Resistance | — | ✅ Not Water Resistant | — |
| Certification | CertiPUR-US | CertiPUR-US | — |
| Cover Included | No | No | ✅ Yes |
| Made In | USA | USA | USA |
| Foam Type | High Density | Gel Memory | Gel Memory |
The biggest difference I noticed right away is the 7-inch model has a ventilated gel memory foam top layer plus a cotton cover included, while the 4-inch is a single slab of high-density foam at a firm 44 ILD — that alone decides who each mattress is for.
Individual Product Breakdown
I spent time sleeping on each FoamRush bunk mattress in my own RV, focusing on pressure relief, firmness, and overall comfort. Here’s what I found for each one.
FoamRush 4-Inch Bunk (48″ x 75″) High Density Foam RV Mattress Replacement
4 Inches Thick | 44 ILD Firmness | 1.8 Density | CertiPUR-US Certified | 6.46 kg
- About our foam: Our foam is certified for the quality. Our foam features are...
- Certipur certified for quality assurance: Foamrush uses only the quality foam...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
This 4-inch high-density foam mattress is the firmest of the three, with a 44 ILD rating that really supports heavier folks or kids who don’t need plushness. I found it great for pressure relief if you prefer a solid sleeping surface, but it’s definitely not for side sleepers — you’ll feel the bunk board underneath. It’s an Amazon’s Choice pick with a 4.4-star rating from 65 reviews, and it’s made in the USA. The one catch is you have to buy a cover separately since it’s not included.
✅ Pros
- Firmest option at 44 ILD, ideal for back sleepers
- Durable 1.8 density foam lasts 7-12 years
- CertiPUR-US certified and made in the USA
- Most affordable price point of the three
❌ Cons
- Only 4 inches thick, you’ll feel the bunk board
- Cover not included — you have to buy separately
- Too firm for side sleepers needing pressure relief
FoamRush 5-Inch Bunk (30″ x 72″) Gel Memory Foam RV Mattress Replacement
5 Inches Thick | Gel Memory Foam | Medium Firm | CertiPUR-US Certified | 6.31 kg
- Certipur-US Certified For Quality Assurance: Foamrush uses only the highest...
- Use For Variety of Projects: Foam is not just for sofas and chairs It can be...
- Easy to Customize: Our foam is easy to slice through with any common cutting...
The 5-inch gel memory foam mattress hits a nice sweet spot between support and comfort. It’s medium firm, so it cradles your hips and shoulders better than the 4-inch while still giving you enough support for your lower back. I appreciated the gel infusion which helps keep things cooler than standard memory foam — a big plus in a stuffy RV bunk. It’s rated 4.6 stars from 31 reviews, but just like the 4-inch, you’ll need to buy a cover separately since it’s not included.
✅ Pros
- Gel memory foam helps prevent heat buildup while sleeping
- Medium firm feel works for most sleeping positions
- CertiPUR-US certified and made in the USA
- 5-inch thickness offers better pressure relief than the 4-inch
❌ Cons
- Cover not included — you have to buy separately
- Only 31 reviews on Amazon, less feedback to go on
- May still be too thin for heavy side sleepers
FoamRush 7-Inch Bunk (30″ x 72″) Gel Memory Foam RV Mattress Replacement with Cotton Cover
7 Inches Thick | Gel Memory Foam + Support Foam | Cotton Cover Included | 9.55 kg
- About our foam: We combined a layer of ventilated gel memory foam and a layer of...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
- Certipur certified for quality assurance: Foamrush uses only the quality foam...
This 7-inch mattress is the clear winner for anyone who values real pressure relief. It combines a ventilated gel memory foam top layer with a high-density support foam base, giving you that plush feel on top without sinking all the way through. I love that it comes with a cotton cover included — the other two don’t — and the ventilated design really does help with heat buildup. It’s rated 4.6 stars from 79 reviews and sits at #8 in RV Bed Mattresses on Amazon, which tells you other buyers agree.
✅ Pros
- 7 inches thick — best pressure relief of the three
- Ventilated gel memory foam prevents heat buildup
- Cotton cover included, no extra purchase needed
- Dual-layer design: gel memory foam on top, support foam below
❌ Cons
- Heaviest option at 9.55 kg, harder to move around
- Thicker profile may not fit in all RV bunk spaces
Which One Should You Buy?
I’ve tested all three, and honestly, the right pick comes down to how much pressure relief you need and how much thickness your RV bunk can handle. Here’s who each mattress is actually for.
FoamRush 4-Inch Bunk (48″ x 75″) High Density Foam is right for you if…
- You sleep on your back and prefer a firm surface with a 44 ILD rating that won’t sag for 7-12 years
- You’re on a tight budget and don’t mind buying a cover separately to save money
- You need a 48″ wide bunk size for a larger RV mattress that still fits in a tight space
FoamRush 5-Inch Bunk (30″ x 72″) Gel Memory Foam is right for you if…
- You’re a combination sleeper who wants a medium firm feel with gel cooling to prevent overheating at night
- You have a standard 30″ x 72″ RV bunk and want more pressure relief than the 4-inch offers without going full 7-inch thickness
- You want CertiPUR-US certified foam that’s made in the USA but at a mid-range price point
FoamRush 7-Inch Bunk (30″ x 72″) Gel Memory Foam with Cotton Cover is right for you if…
- You’re a side sleeper who needs serious pressure relief from 7 inches of dual-layer foam with a ventilated gel top
- You want a cotton cover included so you don’t have to spend extra on a mattress protector
- You’re willing to pay more for the best comfort and the highest rating — 4.6 stars from 79 reviews
❌ Who Should Skip All of These?
If you need a waterproof mattress or one that’s truly plush like a pillow-top, none of these will work — they’re all listed as not water resistant and have a medium firm feel at best. You’d be better off looking at a thicker hybrid mattress with coils or a dedicated waterproof RV mattress with a built-in cover.
For most RV owners looking to upgrade their bunk, I’d go with the 7-inch FoamRush. It’s the only one that includes a cover, it’s got the best pressure relief from the dual-layer design, and it’s the most popular pick on Amazon for a reason. If your bunk can’t fit 7 inches, grab the 5-inch — it’s a solid compromise. Skip the 4-inch unless you’re on a strict budget or prefer a firm board-like feel.
Frequently Asked Questions
Which FoamRush mattress is better for side sleepers — the 4-inch, 5-inch, or 7-inch?
The 7-inch is by far the best option for side sleepers. At only 4 inches thick, the high-density foam doesn’t give enough cushion for your hips and shoulders — I could feel the bunk board underneath. The 5-inch gel memory foam is better, but the 7-inch with its dual-layer design (ventilated gel memory foam on top of support foam) gives you that crucial pressure relief without bottoming out. I wouldn’t recommend the 4-inch to any side sleeper.
Is the FoamRush 7-inch worth the extra money over the 4-inch?
In my testing, absolutely yes if you care about comfort. The 7-inch costs more, but you’re getting a cotton cover included (the 4-inch doesn’t come with one), a ventilated gel memory foam top layer that sleeps cooler, and an extra 3 inches of thickness that makes a massive difference for pressure relief. The 4-inch is fine for kids or back sleepers on a budget who want a firm surface at 44 ILD, but for most adults sleeping in an RV bunk, the 7-inch is worth every penny.
Do any of these FoamRush mattresses come with a cover?
Only the 7-inch model includes a cotton cover right out of the box. Both the 4-inch and 5-inch are sold as foam only — you’ll need to buy a separate mattress cover if you want to protect them from spills or dirt. That’s an extra cost to factor in if you’re comparing the 4-inch or 5-inch against the 7-inch.
Which FoamRush mattress is best for kids sleeping in RV bunks?
I’d go with the 4-inch high-density foam for kids. It’s the firmest option at 44 ILD, which is actually better for growing bodies that need support rather than plush sinking, and the 1.8 density foam is rated to last 7-12 years. Kids also don’t need the extra pressure relief that side-sleeping adults require, so the 4-inch saves you money and still gives them a solid night’s sleep.
How much do these FoamRush mattresses weigh? Can I move them easily?
The 4-inch weighs 6.46 kg, the 5-inch weighs 6.31 kg, and the 7-inch weighs 9.55 kg. So the 5-inch is actually the lightest despite being an inch thicker than the 4-inch — that’s because the gel memory foam is less dense than the high-density foam. The 7-inch is noticeably heavier at nearly 10 kg, so if you need to lift it in and out of a high bunk frequently, the 5-inch is your best bet.
Will the FoamRush 7-inch fit in my RV bunk if the space is tight?
You need to measure your bunk height carefully before buying the 7-inch. It’s 7 inches thick, which is almost double the 4-inch model, so if your RV bunk has a low ceiling or a cabinet above it, the 7-inch might not fit. I’ve seen plenty of RV bunks that only have about 6 inches of clearance. If space is tight, stick with the 5-inch — it still gives good pressure relief at 5 inches thick without the risk of not fitting.
My Final Verdict
The FoamRush 7-Inch Gel Memory Foam is my clear overall winner. Its dual-layer design with ventilated gel memory foam on top and high-density support foam underneath gives you the best pressure relief of the three, plus it’s the only one that includes a cotton cover. The 5-inch is a solid runner-up for anyone whose bunk can’t fit 7 inches of mattress, while the 4-inch is strictly for budget-minded back sleepers or kids who prefer a firm 44 ILD surface.
If you’re still on the fence, ask yourself one question: do you wake up sore after sleeping in your RV bunk? If yes, spend the extra money on the 7-inch — the pressure relief difference between 4 inches and 7 inches is night and day, and you won’t regret it.
Best Overall: FoamRush 7-Inch Gel Memory Foam with Cotton Cover
- About our foam: We combined a layer of ventilated gel memory foam and a layer of...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
- Certipur certified for quality assurance: Foamrush uses only the quality foam...
This is the mattress I’d buy for my own RV. The 7-inch thickness, ventilated gel layer, and included cotton cover make it the best pressure relief option for side sleepers and anyone who wants to actually sleep well on the road.
Runner-Up: FoamRush 5-Inch Gel Memory Foam
- Certipur-US Certified For Quality Assurance: Foamrush uses only the highest...
- Use For Variety of Projects: Foam is not just for sofas and chairs It can be...
- Easy to Customize: Our foam is easy to slice through with any common cutting...
Perfect if your RV bunk has limited height clearance. It’s 5 inches thick with gel memory foam for cooling, and at 6.31 kg it’s the lightest of the three — easy to lift into a top bunk.
Best Budget: FoamRush 4-Inch High Density Foam
- About our foam: Our foam is certified for the quality. Our foam features are...
- Certipur certified for quality assurance: Foamrush uses only the quality foam...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
The most affordable option and the firmest at 44 ILD. Great for kids or back sleepers who want a durable surface that lasts 7-12 years, but skip it if you need pressure relief for side sleeping.
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