What Is a Full XL Mattress?
A Full XL measures 54 inches wide × 80 inches long — the same width as a standard Full/Double but 5 inches longer. That extra length matches Queen, King, and Twin XL mattresses, making it a universal fit for adults of all heights.
Important: A Full XL is NOT a Queen. A Queen is 6 inches wider (60" vs 54"). If you need a Queen, this isn't it.
| Size | Width | Length | Comparison to Full XL |
|---|---|---|---|
| Full/Double | 54" | 75" | Same width, 5" shorter |
| Full XL | 54" | 80" | — |
| Twin XL | 38" | 80" | 16" narrower, same length |
| Queen | 60" | 80" | 6" wider, same length |
Why Full XL Mattresses Are Hard to Find
Walk into any mattress store and ask for a Full XL. Most salespeople will look confused or try to redirect you to a Queen.
The mattress industry standardized around five sizes: Twin, Full, Queen, King, and California King. Full XL exists outside that system. Retailers don't stock it. Demand stays low because availability is limited. It's a cycle that leaves Full XL owners without options.
From my removal work, here's what happens: Full XL mattresses stay in homes far longer than they should — often 10-15+ years instead of the standard 7-8 year lifespan. By the time I pick them up, they're in terrible condition: permanent body impressions, deteriorated foam, compressed coils. The owners knew the mattress was shot. They just didn't know where to find a replacement.
Who Needs a Full XL?
Based on the Full XL mattresses I've removed over the years, owners typically fall into these categories:
Taller sleepers in smaller spaces — You're over 6' tall and need the 80" length, but your room can't fit a Queen's extra 6" of width. Full XL gives you Queen/King length in a smaller footprint.
Medical facilities, dorms, and camps — XL lengths (Twin XL and Full XL) are common in hospitals, assisted living, and dormitories where space is limited but mattresses need to fit adults of all heights.
RV and camper owners — Many RVs come with Full XL beds, especially larger Class A motorhomes. When the factory mattress wears out (and they always do), you need an exact replacement.
Guest rooms and cottages — When you need to accommodate taller guests but the room is too small for a Queen.
Where to Buy Online
Online is where you'll find the widest selection of Full XL mattresses. These retailers specialize in custom and odd sizes.
Brooklyn Bedding / RVMattress.com
4 Mattresses Available in 54×80 Full XL
Brooklyn Bedding manufactures their own mattresses in Phoenix, Arizona. Their RVMattress.com site (same company) focuses specifically on RV and custom sizes with more budget-friendly options.
Mattress Insider
3 Mattresses Available in 54×80 Full XL
Mattress Insider has been making custom-size mattresses in Colorado for over a decade. They specialize in RV, truck, and odd-size mattresses, so Full XL is a standard offering.
Michigan Discount Mattress
Michigan Discount Mattress has specialized in custom and odd-size mattresses since 2005. They offer dozens of Full XL options across different construction types.
Full XL mattresses available:
- Memory foam, hybrid, latex, and innerspring options
- Double-sided (flippable) mattresses — rare find
- Layer-by-layer construction breakdowns
- Filter by firmness and construction type
Shipping: Free to 48 states
Website: michigandiscountmattress.com
Amazon
Amazon carries Full XL mattresses from multiple brands. Search "Full XL mattress 54x80" to see current options.
Brands commonly available:
- Brooklyn Bedding / Dreamfoam
- Novilla
- Zinus (check for fiberglass — avoid if tag says "do not remove cover")
- FoamRush
Note: Quality varies significantly. Look for CertiPUR-US certification and verify the mattress is fiberglass-free.
Where to Buy In-Store
Finding a Full XL mattress in a physical store is difficult. Here are your limited options:
Brooklyn Bedding Showrooms
Brooklyn Bedding operates showrooms in Arizona, Utah, and Minnesota where you can try their mattresses in standard sizes. The feel is identical in Full XL — only dimensions change.
Find locations: brooklynbedding.com/pages/showrooms
Medical Supply Retailers
Some medical supply stores carry Full XL mattresses since XL lengths are common in healthcare settings. Quality is typically basic hospital-grade foam — functional but not comfortable for nightly home use.
Local Custom Mattress Shops
Many cities have local mattress makers who can produce custom sizes. Search for "custom mattress" + your city.
RV Dealerships
Some RV dealerships stock replacement mattresses for common RV sizes including Full XL.
Note: Based on my removal work, quality is typically basic — I recommend buying from one of the manufacturers mentioned on this page.
What I Look for in a Full XL Mattress
Full XL is an unusual size with unusual use cases. The mattresses I remove come from RVs, dorms, guest rooms, and bedrooms where space is tight. What works in these environments is different from what works in a master bedroom with a King. Here's what I've learned from tearing them apart.
Single Sleeper vs. Shared Sleep
Most Full XL mattresses I pick up were used by a single sleeper, not a couple. That changes what matters in construction.
When one person sleeps on a 54-inch-wide mattress, body weight concentrates in the center third. I see this pattern constantly in the mattresses I remove — the middle is destroyed while the edges barely show wear. In mattresses designed for couples (where weight distributes across the full surface), this concentrated wear leads to premature body impressions and breakdown.
What holds up better: Mattresses with reinforced center thirds or zoned support systems. The support core needs to handle concentrated weight, not distributed weight. Pocketed coils with a reinforced lumbar zone work well here. All-foam mattresses need higher-density base foam (at least 2.0 lb/ft³) to resist the concentrated compression.
Thickness Considerations for Different Environments
Full XL mattresses end up in places with height restrictions — RV cabinets, bunk beds, dorms with low ceilings, adjustable bed frames. I've removed mattresses from RVs where the owner couldn't close their overhead storage because the replacement mattress was too thick.
Before you buy, measure your clearance:
- RVs: Check the space between your platform and any overhead cabinets or slide-out mechanisms. Many RV owners need mattresses under 10 inches.
- Adjustable frames: Thick mattresses (12"+) may not flex properly. Check your frame's specs.
- Bunk beds: Safety rails assume a certain mattress height. Too thick and you lose the protection.
The good news: a thinner mattress doesn't mean a worse mattress. An 8-inch mattress with quality materials will outlast a 14-inch mattress with cheap foam. I've torn apart plenty of thick mattresses that were mostly filler — low-density comfort foam stacked on more low-density foam. Focus on material quality, not inches.
Weight and Maneuverability
Full XL mattresses often need to fit through tight spaces — RV doors, narrow hallways, steep stairs to guest rooms. An 80-pound all-foam mattress is much easier to wrestle into an RV than a 120-pound hybrid.
I've done hundreds of RV mattress removals. The owners who bought heavy hybrids often regret it — not because of sleep quality, but because getting the mattress in and out is a two-person ordeal every time they need to access storage underneath or replace the mattress years later.
If portability matters: All-foam mattresses are significantly lighter. Latex mattresses are heavier than memory foam but more durable. Hybrids with coils are heaviest but provide the best support for heavier sleepers.
Foam Quality for Longevity
Like all custom sizes, Full XL mattresses get kept longer than they should because replacements are hard to find. That makes initial quality even more important.
Based on what I see in my teardowns:
- Memory foam comfort layers: Look for 4+ lb/ft³ density. Cheaper foam (under 3 lb/ft³) breaks down within a few years, especially under the concentrated weight of a single sleeper.
- Polyfoam: Should be at least 1.8 lb/ft³. Anything lower crumbles and loses support fast.
- Natural latex: The longest-lasting option. I've removed 15-year-old latex mattresses that still had usable life. Worth the upfront cost if you want the mattress to last.
Why These Details Matter for Full XL
You're buying this size because it fits a specific space — an RV, a dorm, a small room. When that mattress fails, you can't just swap in any mattress from the local store. You need another Full XL, and your options are limited.
I've seen too many people stuck sleeping on worn-out Full XL mattresses because they bought cheap and didn't want to deal with finding another one. Get quality construction upfront. Read my full breakdown of why mattresses fail to understand what separates mattresses that last from ones that end up at my facility in 5 years.
Before You Buy: Check Your Frame
Full XL bed frames are hard to find, so people hold onto them for decades. The problem: a damaged frame will ruin your new mattress.
Check before ordering:
- Support rails — bent, cracked, or wobbly?
- Center support — present and solid?
- Slats — no more than 3-4" apart, none cracked?
- Corner brackets — tightened?
Check Your Box Spring
After 10-15+ years, box springs break down internally. Run your hand along the entire surface. Any soft, sunken, or uneven spots mean it's compromised and will cause your new mattress to sag.
For RV Owners
Check your clearance — Measure the depth available in your RV. A 14" luxury mattress won't work if you only have 10" of clearance.
Check for odd cutouts — Some Full XL RV beds have notches or rounded corners. All-foam mattresses can compress around minor cutouts. Complex shapes may need custom work.
Full XL Sheets and Bedding
Full size sheets (54×75) will NOT fit. They're 5 inches too short and will pop off constantly.
Queen sheets (60×80) can work since they're the same length, but they're 6" wider and will be loose on the sides. Use sheet straps to keep them in place.
The better option: Buy actual Full XL sheets (54×80):
- Amazon — Search "Full XL sheets 54x80"
- Mattress Insider — Custom sheets in any size
- Egyptian Linens
- AB Lifestyles
FAQ
What size is a Full XL mattress?
54 inches wide by 80 inches long. It's the same width as a standard Full/Double but 5 inches longer.
Is Full XL the same as Queen?
No. A Queen is 60" × 80" — 6 inches wider than a Full XL. They're often confused because they're the same length.
Will Full sheets fit a Full XL mattress?
No. Full sheets are 54" × 75", which is 5 inches too short. They'll constantly pop off the corners. Buy Full XL specific sheets (54×80) or use Queen sheets with straps.
How long does a Full XL mattress last?
With quality materials, 7-10 years for nightly use. I regularly pick up Full XL mattresses that are 10-15+ years old — not because they last longer, but because owners kept sleeping on worn-out mattresses since they didn't know where to find replacements.
Can I try a Full XL before buying?
Most online retailers offer 100-365 night trial periods. Some showrooms (Brooklyn Bedding) let you try standard sizes in person — the feel is identical, only dimensions change.
What to Do With Your Old Mattress
When you buy a new Full XL mattress online, you're left to figure out what to do with the old one.
Need Your Old Mattress Removed?
Getting rid of an odd-size mattress can be tricky. I've put together a complete guide to your disposal and recycling options.
See Your Options →About This Guide
