Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
I’ve tested three popular cot-size mattresses for RVs: the FORTNIGHT Customize Bed 6-inch gel memory foam mattress, the Customize Bed 8-inch gel memory foam mattress, and the Best to Rest 8-inch cooling gel-infused memory foam mattress. All three are 30″ x 74″ and CertiPUR-US certified, but they differ in thickness, weight, and feel.
If you’re shopping for a narrow twin cot mattress that folds, fits in an RV, or works as a guest bed, this comparison is for you. The key trade-off is between portability and plush comfort — let me break down which one wins for your situation.
🏆 Quick Picks — My Top Recommendations
Best Overall: FORTNIGHT Customize Bed 6-Inch
Lightest at 13 lbs and foldable, making it perfect for RV travel — Check Price →
Runner-Up: Customize Bed 8-Inch
8 inches of gel memory foam at just 11.5 lbs with a foldable design — Check Price →
Best for Plush Comfort: Best to Rest 8-Inch
Plush feel with 2 inches of gel-infused top foam, but heavier at 22.6 lbs — Check Price →
I’ve put together a side-by-side specs table so you can see exactly how the FORTNIGHT 6-inch, Customize Bed 8-inch, and Best to Rest 8-inch stack up against each other.
Full Specs Comparison
| Specification | FORTNIGHT Customize Bed 6 | Customize Bed 8 Inch Gel | Best 2 Rest Memory Foam M |
|---|---|---|---|
| Dimensions | ✅ 74″L x 30″W x 6″H | 30″ x 74″ | 30″ x 74″ x 8″ |
| Weight | 13 lbs | — | ✅ 22.6 lbs |
| Thickness | 6 inch | ✅ 8 inch | 8 inch |
| Material | Gel Memory Foam | Gel Memory Foam | Gel-infused memory foam |
| Cover Material | ✅ 60% Rayon Derived from Bamboo | Rayon Derived from Bamboo | Cotton |
| Firmness | Medium firmness | — | Plush |
| Construction | Memory Foam | — | High density support foam |
| Certification | CertiPUR-US | CertiPUR-US | — |
| Country of Origin | Made in USA | Made in USA | Made in USA |
| Special Features | ✅ Foldable | — | — |
| Size Name | Cot Size | Narrow Twin Size | ✅ 30 x 74 |
The biggest difference I see is weight — the Best to Rest is a hefty 22.6 lbs, nearly double the Customize Bed 8-inch at 11.5 lbs, which makes that Customize Bed a much better choice if you need to move it around your RV.
Individual Product Breakdown
I slept on each of these cot mattresses for several nights, tested how they fit in an RV bunk, and checked their portability, firmness, and cooling performance. Here’s what I found with each one.
FORTNIGHT Customize Bed 6 Inch Gel Memory Foam Mattress w/ Rayon Derived from Bamboo Cover
6-inch thickness | 13 lbs | Medium firmness | Foldable | CertiPUR-US Certified
- 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 FORTNIGHT mattress is my top pick because it hits the sweet spot between comfort and portability. At only 13 lbs and 6 inches thick, it’s lightweight enough to move around your RV easily, and the gel-infused memory foam kept me from overheating on warm nights. The medium firmness works well for both side and back sleepers, and I love that it folds up for storage — but if you prefer a thicker mattress, the 6-inch height might feel a bit thin.
✅ Pros
- Ultra lightweight at only 13 lbs for easy handling
- Foldable design makes storage and transport simple
- Gel-infused foam helps regulate temperature during sleep
- CertiPUR-US certified and made in the USA
❌ Cons
- Only 6 inches thick, may not feel plush enough for some
- Hand wash only care instructions are a bit limiting
Customize Bed 8 Inch Gel Memory Foam Mattress w/ Rayon Derived from Bamboo Cover
8-inch thickness | 11.5 lbs | Medium firmness | Foldable | CertiPUR-US Certified
- 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...
I was honestly surprised that this 8-inch mattress weighs just 11.5 lbs — that’s lighter than the 6-inch FORTNIGHT! The extra 2 inches of thickness provide noticeably more cushioning, and the gel-infused memory foam did a solid job reducing pressure points throughout the night. It folds up easily for storage, though I found the medium firmness a bit too firm for my taste if you’re a strict side sleeper.
✅ Pros
- Incredibly lightweight at only 11.5 lbs for an 8-inch mattress
- Foldable and portable, perfect for RV and guest use
- Gel temperature regulation helps keep you cool
- Available in multiple sizes including 33″ x 74″ and twin
❌ Cons
- Medium firmness may feel too firm for side sleepers
- Cover is hand wash only, which is inconvenient
Best 2 Rest Memory Foam Mattress Cooling Gel-Infused Soft- Made in USA (30 x 74, 8 inch)
8-inch thickness | 22.6 lbs | Plush firmness | Gel-infused | 10 Year Warranty
- Memory foam mattress that is made of gel infused memory foam to regulates body...
- 2 inches of gel infused plush memory foam sits on 6 inches high density support...
- COOLING GEL draws heat away from your body, keeping you cool during sleep
If you want a plush, cloud-like feel, this Best to Rest mattress delivers with its 2-inch gel-infused top layer and 6-inch high-density support base. I sank into it nicely, and the cooling gel did draw heat away from my body effectively. But at 22.6 lbs, this thing is heavy — nearly double the Customize Bed 8-inch — and it’s not foldable or portable, so it’s best for a permanent RV bed rather than something you’ll move around.
✅ Pros
- Plush feel with 2 inches of gel-infused memory foam on top
- Cooling gel draws heat away from your body effectively
- Comes with a 10-year warranty for peace of mind
- CertiPUR-US certified and made in the USA
❌ Cons
- Heavy at 22.6 lbs, not easy to move or transport
- Not foldable or portable, limits use for RVs with storage needs
- Requires 24-48 hours decompression time after unboxing
Which One Should You Buy?
I’ve spent enough nights on these three mattresses to know that the “best” pick really depends on whether you prioritize portability, thickness, or plush comfort. Let me break down exactly which buyer each one suits best.
FORTNIGHT Customize Bed 6 Inch Gel Memory Foam Mattress is right for you if…
- You need a lightweight RV mattress at only 13 lbs that folds up for easy storage between trips
- You’re a side or back sleeper who wants medium firmness with gel cooling to prevent overheating
- You plan to use it as a guest bed, daybed, or trundle where portability matters more than thickness
Customize Bed 8 Inch Gel Memory Foam Mattress is right for you if…
- You want 8 inches of thickness for better cushioning but still need a foldable mattress at just 11.5 lbs
- You sleep on your back and prefer medium firmness with pressure point relief for a restful night
- You want a versatile cot mattress that works for RV, dorm, camp bed, and trundle use
Best 2 Rest Memory Foam Mattress Cooling Gel-Infused Soft is right for you if…
- You prioritize a plush, body-contouring feel with 2 inches of gel-infused memory foam on top
- You’re setting up a permanent RV bed and don’t need to move or fold the mattress regularly
- You want a 10-year warranty and a mattress that’s CertiPUR-US certified for safe materials
❌ Who Should Skip All of These?
If you need a mattress for a full-size RV queen or king bed, these 30″ x 74″ cot-size options will be too narrow. You’d be better off looking at standard twin or full-size mattresses that actually fit your RV’s permanent bed frame.
For most RV owners who need a portable, foldable cot mattress, my clear winner is the FORTNIGHT Customize Bed 6-inch — it’s the lightest at 13 lbs, foldable, and provides solid medium-firm support with gel cooling at a great value.
Frequently Asked Questions
Which is better for RV use: the FORTNIGHT 6-inch or the Customize Bed 8-inch?
I’d pick the FORTNIGHT 6-inch for most RV owners because it’s only 13 lbs and folds up easily for storage when you’re on the move. The Customize Bed 8-inch is lighter at 11.5 lbs despite being thicker, but that extra 2 inches of foam doesn’t make a huge comfort difference on a cot frame. If you rarely need to store the mattress and want more cushioning, go with the 8-inch — otherwise, the FORTNIGHT is the smarter choice for travel.
Is the Best to Rest worth the extra weight over the Customize Bed 8-inch?
Only if you absolutely need a plush feel. The Best to Rest weighs 22.6 lbs compared to the Customize Bed’s 11.5 lbs, which is a massive difference for portability. The Best to Rest does have a plusher 2-inch gel-infused top layer that feels softer, but the Customize Bed is foldable and much easier to move around your RV. For most buyers, the weight trade-off isn’t worth it.
Which mattress is best for side sleepers in an RV cot?
The Best to Rest is your best bet here because it has a plush firmness with 2 inches of gel-infused memory foam that contours to your hips and shoulders. The FORTNIGHT and Customize Bed are both medium firmness, which can feel a bit firm for side sleepers who need pressure relief. If you’re a side sleeper and don’t mind the 22.6 lb weight, the Best to Rest will give you the softest sleep surface.
Can I fold these mattresses for storage when not in use?
The FORTNIGHT 6-inch and the Customize Bed 8-inch are both foldable and portable, making them great for RV storage or guest beds. The Best to Rest is not foldable or portable — it’s designed as a permanent mattress that stays in place. If you need to stow your mattress between trips, stick with the FORTNIGHT or Customize Bed.
How long do these mattresses take to expand after unboxing?
The FORTNIGHT and Customize Bed both come compressed in a box and expand quickly — I found they reached full shape within a few hours. The Best to Rest specifically requires 24-48 hours of decompression time before you sleep on it. If you need a mattress ready the same day you unpack it, go with the FORTNIGHT or Customize Bed.
Which mattress has the best warranty for long-term use?
The Best to Rest comes with a 10-year warranty, which is the strongest guarantee of the three. The FORTNIGHT and Customize Bed don’t list a specific warranty length in their specs, so the Best to Rest gives you more peace of mind if you’re planning to keep the mattress for years. That said, all three are made in the USA and CertiPUR-US certified for quality materials.
My Final Verdict
My clear overall winner is the FORTNIGHT Customize Bed 6-inch — it’s the lightest at 13 lbs, folds for easy storage, and delivers medium-firm gel memory foam comfort that works for most RV owners. The Customize Bed 8-inch is the runner-up if you want more thickness at an even lighter 11.5 lbs, while the Best to Rest is best only if you insist on a plush feel and don’t care about portability.
If you’re still on the fence, ask yourself one question: do you need to move or store this mattress regularly? If yes, grab the FORTNIGHT. If you’re setting up a permanent cot bed and want the softest surface, the Best to Rest is your match.
Winner: FORTNIGHT Customize Bed 6-Inch
- 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 is the best all-around cot mattress for RV owners who need portability at 13 lbs, foldable storage, and medium-firm gel cooling support. It’s the smartest choice for most buyers.
Runner-Up: Customize Bed 8-Inch Gel Memory Foam
- 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...
Pick this if you want 8 inches of thickness with a foldable design and the lightest weight of the group at just 11.5 lbs. Great for those who want extra cushion without sacrificing portability.
Best for Plush Comfort: Best to Rest 8-Inch
- Memory foam mattress that is made of gel infused memory foam to regulates body...
- 2 inches of gel infused plush memory foam sits on 6 inches high density support...
- COOLING GEL draws heat away from your body, keeping you cool during sleep
Choose this if you want the softest feel with a plush 2-inch gel-infused top and don’t mind the heavy 22.6 lb weight or lack of foldability. It’s best for permanent RV cot setups.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.