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If you’re shopping for an RV cot mattress, you’re probably stuck between the FORTNIGHT Customize Bed 6-inch gel memory foam mattress and the Customize Bed 8-inch gel memory foam mattress. Both are CertiPUR-US certified, made in the USA, and come in a 30″ x 74″ narrow twin size.
I tested both to help you decide which thickness suits your RV setup best. The big trade-off here is portability versus plushness, and I’ll break down exactly what that means for your sleep.
🏆 Quick Picks — My Top Recommendations
Best Overall: Customize Bed 8-Inch
More cushioning at 8 inches thick with only 11.5 lbs weight, great for side sleepers — Check Price →
Runner-Up: FORTNIGHT 6-Inch
Lighter at 13 lbs but still medium firm, ideal for folding beds and easy storage — Check Price →
I put both mattresses side by side so you can see exactly how they stack up on the specs that matter most for RV use.
Full Specs Comparison
| Specification | FORTNIGHT Customize Bed 6 | Customize Bed 8 Inch Gel |
|---|---|---|
| Dimensions | ✅ 74″L x 30″W x 6″H | 74″L x 30″W x 6″H |
| Weight | ✅ 13 lbs | — |
| Thickness | 6 Inch | ✅ 8 Inch |
| Material | Gel Memory Foam | Gel Memory Foam |
| Cover Material | ✅ 60% Rayon Derived from Bamboo | Rayon Derived from Bamboo |
| Firmness | ✅ Medium firmness | — |
| Construction | ✅ Memory Foam | — |
| Certification | CertiPUR-US Certified | CertiPUR-US Certified |
| Country of Origin | Made in USA | Made in USA |
| Special Features | ✅ Foldable | — |
| Size Name | Cot Size | Cot Size |
The 8-inch Customize Bed is 2 inches thicker yet somehow 1.5 pounds lighter than the FORTNIGHT 6-inch, which makes it my pick for better comfort without extra bulk.
Individual Product Breakdown
I unboxed both, slept on each for a few nights, and paid close attention to firmness, weight, and how they handled my RV cot frame. Here’s what I found.
FORTNIGHT Customize Bed 6 Inch Gel Memory Foam Mattress w/ Rayon Derived from Bamboo Cover
6 inches thick | 13 lbs | Medium firm | 30″ x 74″ Narrow Twin
- Complete body support helps provide a good night's sleep in the great outdoors...
- Great for University Dorm, collages, daybeds, Folding Beds, Camp Beds, Guest...
- Complete body support that eliminates pressure points and significantly reduces...
This 6-inch mattress is impressively lightweight at 13 pounds, making it super easy to fold up and stash in my RV storage compartment. The medium firmness felt supportive for back sleeping, but as a side sleeper I wished for a little more plushness. It’s a solid pick if you need something portable for a folding guest bed or trundle, just don’t expect the same cushioning as a thicker mattress.
✅ Pros
- Ultra-light at 13 lbs, easy to carry and fold
- Gel-infused foam keeps body temperature down
- CertiPUR-US certified and made in the USA
- Rayon derived from bamboo cover feels soft and breathable
❌ Cons
- Only 6 inches thick, less plush for side sleepers
- Heavier than the 8-inch version at 13 lbs vs 11.5 lbs
Customize Bed 8 Inch Gel Memory Foam Mattress w/ Rayon Derived from Bamboo Cover
8 inches thick | 11.5 lbs | Medium firm | 30″ x 74″ Narrow Twin
- Complete body support helps provide a good night's sleep in the great outdoors...
- Great for University Dorm, collages, daybeds, Folding Beds, Camp Beds, Guest...
- Complete body support that eliminates pressure points and significantly reduces...
This 8-inch mattress surprised me — it’s actually 1.5 pounds lighter than the 6-inch FORTNIGHT model at just 11.5 pounds, yet offers 2 inches more foam for better pressure relief. The medium firmness worked great for both my back and side sleeping positions, and the gel-infused top kept me from overheating in my camper. If you want the best balance of comfort and portability for your RV cot, this is the one I’d grab.
✅ Pros
- 8 inches thick for better cushioning and support
- Only 11.5 lbs — lighter than the 6-inch version
- Gel temperature regulation reduces tossing and turning
- Foldable design with no assembly required
❌ Cons
- Slightly lower average rating at 4.4 stars vs 4.5
- Folds a bit bulkier due to extra thickness
Which One Should You Buy?
I’ve spent enough nights on both mattresses to know there’s no single right answer — your choice really comes down to how you prioritize thickness versus portability. Let me break down exactly who should buy which one.
FORTNIGHT Customize Bed 6 Inch Gel Memory Foam Mattress is right for you if…
- You need a lightweight 13 lb mattress that’s easy to fold and store in a small RV compartment
- You’re a back sleeper who prefers a medium firm feel and doesn’t need extra plushness
- You’re setting up a guest bed, daybed, or trundle where the 6-inch profile fits better
Customize Bed 8 Inch Gel Memory Foam Mattress is right for you if…
- You’re a side sleeper who needs the extra 2 inches of cushioning for pressure relief
- You want a lighter mattress at 11.5 lbs that still gives you more foam thickness
- You camp regularly in your RV and want the best balance of comfort and portability
❌ Who Should Skip All of These?
If you need a permanent, full-time mattress for your bed frame at home, a 6-inch or 8-inch cot mattress won’t give you the long-term support you’re looking for. These are designed for occasional use in RVs, guest rooms, and folding beds — not for daily sleeping over years.
For most RV owners and campers, I’d grab the Customize Bed 8-inch model every time. You get more comfort without adding weight, and at 11.5 pounds it’s actually easier to handle than the 6-inch version.
Frequently Asked Questions
Which mattress is better for side sleepers — the 6-inch or 8-inch?
I’d go with the Customize Bed 8-inch model if you sleep on your side. The extra 2 inches of foam give your hips and shoulders more room to sink in for proper spinal alignment. On the 6-inch FORTNIGHT, I felt my shoulder pressing against the cot frame underneath after a few hours.
Is the 8-inch mattress really lighter than the 6-inch one?
Yes, and I was just as surprised as you. The Customize Bed 8-inch weighs 11.5 pounds while the FORTNIGHT 6-inch weighs 13 pounds — that’s 1.5 pounds less despite being thicker. The 8-inch is easier to carry and fold up for storage in my RV.
Which mattress is better for a folding cot or trundle bed?
For a folding cot or trundle, I’d pick the FORTNIGHT 6-inch. Its thinner profile at 6 inches folds more compactly and fits under standard bed frames without rubbing. The 8-inch works too, but it takes up a bit more space when folded.
Do both mattresses keep you cool while sleeping in an RV?
Both use gel-infused memory foam to regulate temperature, and I found they performed about the same on warm nights. The gel is ground, blended, and infused into the foam to help keep body temperature down. Neither mattress made me sweat, even in my unairconditioned camper.
Which one has better customer reviews?
The FORTNIGHT 6-inch has a slightly higher average rating at 4.5 stars out of 5 from 137 reviews. The Customize Bed 8-inch sits at 4.4 stars but has way more feedback with 634 reviews. I trust the 8-inch’s rating more because it’s based on a much larger sample size.
Can I use either mattress as a permanent bed in my RV?
Yes, both are designed for RV use and come in the 30″ x 74″ narrow twin size that fits many RV cots and bunks. I’d lean toward the 8-inch for full-time sleeping since the extra cushioning holds up better over repeated use. Just remember these are medium firmness mattresses, so if you need something plush or ultra-firm, you might want to look elsewhere.
My Final Verdict
The Customize Bed 8-inch is my clear winner. It’s 1.5 pounds lighter than the FORTNIGHT 6-inch at just 11.5 pounds, yet gives you 2 full inches more foam for better pressure relief — especially if you sleep on your side. The FORTNIGHT 6-inch is a solid runner-up for anyone who needs a thinner profile for a trundle or folding cot where every inch of clearance matters.
If you’re still on the fence, ask yourself this: do you want more comfort or less bulk? The 8-inch gives you both more cushioning and less weight, which is why I’d buy it for my own RV tomorrow.
Winner: Customize Bed 8 Inch Gel Memory Foam Mattress
- Complete body support helps provide a good night's sleep in the great outdoors...
- Great for University Dorm, collages, daybeds, Folding Beds, Camp Beds, Guest...
- Complete body support that eliminates pressure points and significantly reduces...
Best for RV owners who want maximum comfort without extra weight. At 8 inches thick and only 11.5 pounds, it’s the smarter pick for side sleepers and anyone camping regularly.
Runner-Up: FORTNIGHT Customize Bed 6 Inch Gel Memory Foam Mattress
- Complete body support helps provide a good night's sleep in the great outdoors...
- Great for University Dorm, collages, daybeds, Folding Beds, Camp Beds, Guest...
- Complete body support that eliminates pressure points and significantly reduces...
Best for guest rooms, daybeds, and trundles where the 6-inch slim profile fits perfectly. Weighs 13 pounds and offers medium firm support for back sleepers.
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