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If you’re shopping for an RV mattress replacement, you’re probably staring at three FoamRush options: the 10-Inch Cool Gel Memory Foam (42″ x 80″), the 6-Inch High Density Foam (28″ x 75″), and the 10-Inch Extra Firm High Density Foam with a cotton cover (38″ x 80″). I’ve dug into the specs on all three to figure out which one actually belongs in your camper.
This comparison is for anyone tired of sleeping on a worn-out RV mattress who wants real pressure relief without breaking the bank. The trade-off here is thickness versus firmness versus size availability — and I’ll help you pick the right one.
🏆 Quick Picks — My Top Recommendations
Best Overall: FoamRush 10-Inch Cool Gel
10 inches of medium-firm gel foam with CertiPUR-US certification, best for comfort and pressure relief — Check Price →
Runner-Up: FoamRush 6-Inch High Density
Firm support at just 6 inches thick, ideal for tight bunks and heavy use (lasts 7-12 years) — Check Price →
Best for Waterproofing: FoamRush 10-Inch Extra Firm
10 inches of extra-firm foam with a waterproof cotton cover and non-skid bottom — Check Price →
Here’s how the FoamRush 10-Inch Cool Gel, 6-Inch High Density, and 10-Inch Extra Firm stack up side-by-side on the specs that actually matter for an RV mattress.
Full Specs Comparison
| Specification | FoamRush 10-Inch Bunk | FoamRush 6-Inch Bunk | FoamRush 10-inch Twin |
|---|---|---|---|
| Thickness | ✅ 10-Inch | 6-Inch | 10-inch |
| Size | ✅ 42″ x 80″ | 28″ x 75″ | 38″ x 80″ |
| Material | Cool Gel Memory Foam | High Density Foam | High Density Foam |
| Firmness | Medium Firm | Firm | Extra Firm |
| Certification | — | CertiPUR-US Certified | CertiPUR-US Certified |
| Cover Included | No | No | ✅ Yes |
| Country of Origin | Made in USA | Made in USA | Made in USA |
| Weight Capacity | — | — | — |
| Warranty | — | — | — |
| Foam Type | Gel Foam | High Density Foam | High Density Foam |
| Mattress Type | Bunk | Bunk | Twin |
The biggest difference I see is that the 10-Inch Extra Firm is the only one with a waterproof cotton cover and a non-skid bottom, while the other two don’t include any cover at all.
Individual Product Breakdown
I spent time comparing the thickness, firmness, available sizes, and included accessories on all three FoamRush mattresses. Here’s what I found in each one.
FoamRush 10-Inch Bunk (42″ x 80″) Cool Gel Memory Foam RV Mattress Replacement
10-inch thickness | Cool Gel Memory Foam | Medium Firm | CertiPUR-US Certified | 3.8 out of 5 stars (27 reviews)
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- Use for Variety of Projects: Foam is not just for sofas and chairs It can be...
- Easy to Customize: Our foam is easy to work through with tools such as most...
This is the thickest option at 10 inches, and the cool gel memory foam gives it a medium-firm feel that balances comfort and pressure relief. I like that it’s CertiPUR-US certified for safety, but you need to know the cover is not included — you’ll have to buy one separately or add it as an option. It’s best for anyone with a standard 42″ x 80″ bunk who wants plush support without sinking too much.
✅ Pros
- 10 inches of gel-infused foam for great pressure relief
- CertiPUR-US certified for quality and safety
- Available in many sizes, from 28″ x 72″ up to 48″ x 80″
- Made in the USA
❌ Cons
- Cover not included in the base price
- Not waterproof — spills could damage the foam
- Only 3.8 out of 5 stars, some users reported softness
FoamRush 6-Inch Bunk (28″ x 75″) High Density Foam RV Mattress Replacement
6-inch thickness | High Density Foam | Firm (44 ILD) | CertiPUR-US Certified | 4.0 out of 5 stars (16 reviews)
- About our Foam: Our foam is certified for suitability. Our foam features are...
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
At just 6 inches thick with a firm 44 ILD density, this is the most compact and supportive option for tight RV bunks. I appreciate that it’s rated to last 7-12 years, but it’s only available in a 28″ x 75″ size in this configuration — and again, there’s no cover included. This one is perfect for a camper bunk that doesn’t have much vertical clearance and needs a firm sleeping surface.
✅ Pros
- Firm 44 ILD foam provides excellent support
- Rated to last 7-12 years, very durable
- CertiPUR-US certified for safety
- Lightweight at only 6.24 kg (13.8 lbs)
❌ Cons
- Only 6 inches thick — less cushion for side sleepers
- Cover not included
- Not waterproof
FoamRush 10-inch Twin (38″ x 80″) Extra Firm High Density Foam RV Mattress Replacement W/Cotton Cover
10-inch thickness | Extra Firm High Density Foam | Waterproof Cotton Cover | CertiPUR-US Certified | Non-Skid Bottom
- About our Foam: Our foam is certified for suitability. Our foam features are...
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- About our Mattress Cover: Made of ultra plush cotton. Waterproof design prevents...
This one stands out because it comes with a waterproof cotton cover that has a non-skid bottom and a full 360-degree zipper — the other two don’t include any cover at all. It’s extra firm and 10 inches thick, so it offers serious support for heavier folks, but the 38″ x 80″ twin size won’t fit every RV bunk. If you need waterproof protection and a machine-washable cover, this is your pick.
✅ Pros
- Includes a waterproof cotton cover with non-skid bottom
- Extra firm support for heavy use
- Cover is machine washable with 360-degree zipper
- CertiPUR-US certified and made in the USA
❌ Cons
- Only available in twin (38″ x 80″) — limited size options
- Extra firm may be too hard for some sleepers
- Higher price point than the other two
Which One Should You Buy?
I’ve tested the numbers on all three, and the right pick comes down to how much vertical space you have in your RV bunk and whether you need a cover included. Here’s exactly who each mattress is built for.
FoamRush 10-Inch Cool Gel (42″ x 80″) is right for you if…
- You have a standard 42″ x 80″ bunk and want the most cushion at 10 inches thick
- You prefer a medium-firm feel with cool gel memory foam for pressure relief
- You don’t mind buying a separate cover since it’s not included in the base price
FoamRush 6-Inch High Density (28″ x 75″) is right for you if…
- Your RV bunk has limited headroom and only fits a 6-inch mattress
- You need a firm 44 ILD sleeping surface that lasts 7-12 years
- You’re on a tight budget and want the most affordable FoamRush option
FoamRush 10-Inch Extra Firm Twin (38″ x 80″) with Cotton Cover is right for you if…
- You want a waterproof mattress with a machine-washable cotton cover included
- You need extra firm support at 10 inches thick for heavier body weight
- Your RV uses a 38″ x 80″ twin size and you want a non-skid bottom to keep it in place
❌ Who Should Skip All of These?
If your RV bunk is a non-standard size like a short queen (60″ x 74″) or a truck sleeper (32″ x 29″), none of these specific configurations will fit without custom cutting — and FoamRush does make those sizes, so check their other listings. Also, if you absolutely need a mattress that arrives fully assembled with a cover in the box, the 10-Inch Extra Firm is your only option here since the other two don’t include covers.
For most RV owners with a standard 42″ x 80″ bunk who want comfort without fuss, I’d grab the FoamRush 10-Inch Cool Gel — it’s the best balance of thickness, pressure relief, and size availability. If your bunk is shallow or you’re on a strict budget, the 6-Inch High Density gets the job done at a firm 44 ILD rating that will hold up for years.
Frequently Asked Questions
Which FoamRush mattress is better for a tight RV bunk with low headroom?
Go with the FoamRush 6-Inch High Density (28″ x 75″). At only 6 inches thick, it leaves you the most vertical space in a cramped bunk. It’s also rated at a firm 44 ILD, which means it won’t sag or compress over time like a softer mattress might. The trade-off is less plushness for side sleepers, but if headroom is your main problem, this is the clear winner.
Is the FoamRush 10-Inch Extra Firm worth the extra money over the 6-Inch model?
It depends on what you’re after. The 10-Inch Extra Firm comes with a waterproof cotton cover that has a non-skid bottom and a 360-degree zipper — the 6-Inch model includes no cover at all. If you need waterproof protection and a machine-washable cover, the extra cost makes sense. But if you just need a firm, durable slab of foam for a shallow bunk, the 6-Inch gets the job done for less.
Which FoamRush mattress is best for pressure relief and comfort?
That’s the FoamRush 10-Inch Cool Gel (42″ x 80″). It’s the only one of the three that uses cool gel memory foam, and at 10 inches thick with a medium-firm feel, it offers the best balance of sink-in comfort and support. The other two are high-density foam with a firmer feel, so they won’t contour to your body the same way.
Does the FoamRush 6-Inch mattress come with a cover?
No, it does not. The base model is just the high-density foam slab — no cover, no waterproofing. You can add a mattress cover or a navy cover as an option when ordering, but it costs extra. The same goes for the 10-Inch Cool Gel. Only the 10-Inch Extra Firm Twin comes with a cotton cover included in the box.
Which FoamRush mattress is best for waterproof protection in an RV?
The FoamRush 10-Inch Extra Firm Twin (38″ x 80″) is the only one specifically listed as waterproof. It has a waterproof cotton cover with a non-skid bottom and a full 360-degree zipper, and it’s machine washable. The other two are labeled “Not Water Resistant,” so spills will soak into the foam and potentially ruin it.
Can I cut or customize these FoamRush mattresses to fit my RV bunk?
Yes, all three are made from foam that FoamRush says can be cut with a slicing device and trimmed to size. The 10-Inch Cool Gel and the 6-Inch High Density are sold as raw foam slabs, so they’re easier to customize. The 10-Inch Extra Firm has a cover sewn on, which makes cutting more complicated — you’d have to remove the cover first.
My Final Verdict
After comparing all three, my winner is the FoamRush 10-Inch Cool Gel (42″ x 80″) — it’s the only one that combines 10 inches of gel-infused memory foam with a medium-firm feel for real pressure relief, and it comes in the most sizes. The runner-up, the 6-Inch High Density, is your best bet if you’re crammed into a shallow bunk and need a firm 44 ILD surface that’ll last 7-12 years on a budget.
If you’re still on the fence, ask yourself one question: do you need a cover included or waterproof protection? If yes, the 10-Inch Extra Firm Twin with its cotton cover is your pick. If not, the 10-Inch Cool Gel gives you the best sleep quality for a standard RV bunk.
Best Overall: FoamRush 10-Inch Cool Gel (42″ x 80″)
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- Use for Variety of Projects: Foam is not just for sofas and chairs It can be...
- Easy to Customize: Our foam is easy to work through with tools such as most...
Perfect for anyone with a standard 42″ x 80″ RV bunk who wants 10 inches of cool gel memory foam with medium-firm support and CertiPUR-US certification.
Runner-Up: FoamRush 6-Inch High Density (28″ x 75″)
- About our Foam: Our foam is certified for suitability. Our foam features are...
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- Versatile: Our comfortable High Density Foam mattress has a variety of possible...
Best for tight bunks with limited headroom — the 6-inch profile and firm 44 ILD foam offer solid support and durability for 7-12 years.
Best for Waterproofing: FoamRush 10-Inch Extra Firm Twin (38″ x 80″)
- About our Foam: Our foam is certified for suitability. Our foam features are...
- Certipur-US Certified for Quality Assurance: Foamrush uses only the quality foam...
- About our Mattress Cover: Made of ultra plush cotton. Waterproof design prevents...
Ideal if you need a waterproof mattress with a machine-washable cotton cover and non-skid bottom — just make sure your RV fits the 38″ x 80″ twin size.
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