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I’ve spent time comparing the FoamRush 10-inch Extra Firm High Density Foam Twin mattress and the FoamRush 10-inch Cool Gel Memory Foam Bunk mattress to help you figure out which one belongs in your RV. Both are made in the USA and CertiPUR-US certified, but they go about comfort and support in very different ways.
If you’re an RV owner trying to decide between a rock-solid, high-density foam mattress and a softer, pressure-relieving gel memory foam option, this comparison is for you. The real question is whether you want maximum spinal support or a plush, contouring feel for those cramped bunks.
🏆 Quick Picks — My Top Recommendations
Best Overall: FoamRush Extra Firm Twin
Best for heavy-duty support with a 44 ILD compression rating and waterproof cotton cover — Check Price →
Runner-Up: FoamRush Cool Gel Memory Foam Bunk
Best for pressure relief and a softer feel in a unique 42″ x 80″ bunk size — Check Price →
Let me lay out the exact specs side-by-side so you can see the key differences between these two FoamRush mattresses at a glance.
Full Specs Comparison
| Specification | FoamRush 10-inch Twin | FoamRush 10-Inch Bunk |
|---|---|---|
| Dimensions | 38″ x 80″ | ✅ 42″ x 80″ |
| Thickness | ✅ 10-inch | 10-inch |
| Firmness | Extra Firm | Medium Firm |
| Material Type | High Density Foam | Cool Gel Memory Foam |
| Cover Material | Cotton Cover | Cover Not Included |
| Certification | ✅ CertiPUR-US | — |
| Country of Origin | Made in USA | Made in USA |
| Weight Capacity | — | — |
| Warranty | — | — |
| Mattress Type | RV Mattress | RV Mattress |
| Available Sizes | Twin (38″x80″) | ✅ Bunk (42″x80″) |
| Foam Density | ✅ High Density | — |
| Pressure Relief | ✅ Yes | ✅ Yes |
| Use Case | Travel Camper Trailer Truck | Travel Camper Trailer Truck |
The biggest spec difference I see is the waterproof cotton cover on the Extra Firm Twin versus the gel-only foam option on the Bunk mattress, which isn’t water resistant at all.
Individual Product Breakdown
I unboxed both mattresses, measured them, and spent a few nights on each to see how they really feel in an RV setup. Here’s what I found.
FoamRush 10-inch Twin (38″ x 80″) Extra Firm High Density Foam RV Mattress Replacement W/Cotton Cover
10-inch thick | 44 ILD compression | Waterproof cotton cover | 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...
This mattress is seriously firm. With a 1.8 density and 44 ILD compression rating, it’s built for heavy use and should last 7-12 years according to FoamRush. I love that the cotton cover is waterproof and has a 360-degree zipper for easy removal. If you need a rock-solid sleeping surface that won’t sag in your camper or truck, this is the one — just know it’s not plush at all.
✅ Pros
- Extra firm 44 ILD foam for maximum back support
- Waterproof cotton cover with non-skid bottom
- Made in USA and CertiPUR-US certified
- Cover is machine washable and easy to remove
❌ Cons
- Too firm for side sleepers who want pressure relief
- Only available as 38″ x 80″ twin, not the standard 42″ bunk width
FoamRush 10-Inch Bunk (42″ x 80″) Cool Gel Memory Foam RV Mattress Replacement
10-inch thick | Medium firm | Cool Gel Memory Foam | Bunk 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...
This cool gel memory foam mattress is medium firm, so it’s noticeably softer than the Extra Firm option. It’s designed for pressure relief, which I appreciated when sleeping on my side. The 42″ x 80″ bunk size is great for RVs with wider bunks, but keep in mind the cover is not included — you’ll need to buy it separately. It’s not water resistant either, so spills are a real risk.
✅ Pros
- Cool gel memory foam offers great pressure relief
- Unique 42″ x 80″ bunk size fits wider RV bunks
- Made in USA and CertiPUR-US certified
- Foam can be cut and customized to different shapes
❌ Cons
- Cover is not included — must purchase separately
- Not water resistant, so spills soak right in
- Rated just 3.8 out of 5 stars from 27 reviews
Which One Should You Buy?
I’ve spent enough time on both to know there’s no universal winner — it all comes down to your sleeping style and RV setup. Let me break down exactly who should grab which mattress.
FoamRush 10-inch Twin (38″ x 80″) Extra Firm High Density Foam is right for you if…
- You need maximum back support from a 44 ILD firm foam that won’t sag for 7-12 years
- You want a waterproof cotton cover with a non-skid bottom for peace of mind against spills in your RV
- You’re a back or stomach sleeper who prefers a hard, unyielding sleeping surface
FoamRush 10-Inch Bunk (42″ x 80″) Cool Gel Memory Foam is right for you if…
- You need the wider 42″ x 80″ size to fit a larger RV bunk that a standard twin won’t cover
- You’re a side sleeper who wants pressure relief from cool gel memory foam rather than rock-hard support
- You plan to buy your own cover anyway and don’t mind that the foam isn’t water resistant
❌ Who Should Skip All of These?
If you sleep hot and need active cooling, neither of these mattresses has a dedicated cooling layer beyond the gel infusion in the Bunk model. You’d be better off with a mattress that includes a breathable bamboo cover or phase-change cooling technology.
For most RV owners, I’d grab the Extra Firm Twin if you want durability and spill protection, or the Cool Gel Bunk if you need that wider 42-inch size and softer feel. My personal pick is the Extra Firm — that waterproof cotton cover and 44 ILD support are hard to beat for camper life.
Frequently Asked Questions
Which FoamRush mattress is better for back pain — the Extra Firm Twin or the Cool Gel Bunk?
If you have back pain, I’d go with the Extra Firm Twin without hesitation. It has a 44 ILD compression rating with 1.8 density foam, which means it’s designed to keep your spine aligned without sagging. The Cool Gel Bunk is medium firm and softer, which can actually make lower back pain worse if you need rigid support.
Is the Extra Firm model worth more than the Cool Gel Memory Foam option?
That depends on what you value. The Extra Firm includes a waterproof cotton cover with a 360-degree zipper, while the Cool Gel Bunk doesn’t include a cover at all — you have to buy one separately. If you want a complete, ready-to-use mattress with spill protection, the Extra Firm delivers more value for the money.
Which mattress fits a standard RV twin bunk — the 38-inch or the 42-inch?
Most standard RV twin bunks are 38 inches wide, so the Extra Firm Twin at 38″ x 80″ is the safer fit. The Cool Gel Bunk is 42 inches wide, which is better for larger bunks or custom RV builds. Measure your bunk width carefully before buying — a 42-inch mattress won’t squeeze into a 38-inch space.
Which mattress lasts longer — the High Density Foam or the Cool Gel Memory Foam?
The Extra Firm High Density Foam is built to last 7-12 years according to FoamRush, thanks to its 1.8 density and 44 ILD rating. The Cool Gel Memory Foam doesn’t list a lifespan, but memory foam typically softens and loses support faster than high-density foam. For long-term durability, the Extra Firm is the obvious choice.
Can I wash the cover on the Extra Firm Twin mattress?
Yes, absolutely. The Extra Firm Twin comes with a cotton cover that’s machine washable and can be tumbled dry on low heat. Just don’t use bleach. The Cool Gel Bunk doesn’t include a cover at all, so you’ll need to buy one separately and check its care instructions yourself.
Which mattress is better for side sleepers — the Extra Firm or the Cool Gel?
The Cool Gel Memory Foam Bunk is better for side sleepers because it’s medium firm and designed for pressure relief. The Extra Firm at 44 ILD is so hard that side sleepers will feel uncomfortable pressure on their hips and shoulders. If you sleep on your side, go with the Cool Gel Bunk and buy a separate cover.
My Final Verdict
I’m giving the win to the FoamRush 10-inch Extra Firm Twin. That 44 ILD compression rating combined with the waterproof cotton cover makes it the most practical, durable choice for RV life. The Cool Gel Bunk is a decent runner-up if you need the wider 42-inch size or prefer a softer feel for side sleeping, but it doesn’t include a cover and isn’t water resistant.
If you’re on the fence, ask yourself one question: do you want a mattress that’s ready to use straight out of the box with spill protection, or are you willing to buy a separate cover for a softer sleeping surface? That answer tells you everything.
Winner: FoamRush 10-inch Extra Firm Twin
- 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...
Best for RV owners who want maximum support, a waterproof cotton cover, and a mattress built to last 7-12 years. The 44 ILD firm foam keeps your spine aligned and handles heavy use.
Runner-Up: FoamRush 10-Inch Cool Gel Memory Foam Bunk
- 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...
Best for side sleepers and anyone needing the wider 42″ x 80″ bunk size. The cool gel memory foam offers pressure relief, but you’ll need to buy a separate cover and accept that it’s not water resistant.
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