Mattresses
Best Twin XL Mattresses
Quick answer
The LETMOON Twin XL Mattress is our top pick among twin XL mattresses at $209.99, a 12 inch hybrid with CertiPUR-US certified foam and a manufacturer-described cooling feature, the most published features of the 4 true twin XLs in this catalog.
The LETMOON Twin XL Mattress is our top pick among twin XL mattresses at $209.99, a 12 inch twin XL hybrid with CertiPUR-US certified foam and a manufacturer-described cooling feature. A twin XL is the same 38 inch width as a standard twin but 5 inches longer, 80 inches instead of 75, which is the exact fix for a taller single sleeper who keeps outgrowing a standard twin. Only 4 mattresses in this catalog are true twin XL, so the tiers below are honest about that limited count and use a standard twin or a full as a clearly marked alternative where it makes sense.
On this page
- What are the exact dimensions of a twin XL mattress, and who needs one?
- How does a twin XL compare on size to a twin and a full?
- Which twin XL mattress costs the least?
- Which twin XL adds thickness, and is a standard twin enough instead?
- Which twin XL goes furthest on features, and when does a full make more sense?
- How do the 4 true twin XL mattresses compare on specs?
What are the exact dimensions of a twin XL mattress, and who needs one?
A standard twin XL mattress measures 38 inches wide by 80 inches long, the same width as a standard twin but 5 inches longer. That extra 5 inches matches the length of a queen or standard king, which is why twin XL is the default size in college dorms, where taller students outgrow a standard 75 inch twin quickly. At 80 inches, a twin XL fits sleepers up to roughly 74 to 76 inches tall by the common convention that a mattress should run 4 to 6 inches longer than its tallest user, a meaningful jump over the roughly 69 to 71 inch ceiling of a standard twin.
Twin XL is also the building block of a split king setup: two twin XL mattresses placed side by side create the same 76 by 80 inch footprint as a single king, letting each side of the bed sit on its own mattress or firmness. That layout only makes sense with a split-compatible frame or an adjustable base built for it, and none of the mattresses in this catalog are sold as a matched split king pair, but the Split Size Decision Calculator is worth checking if that setup is being considered.
At 38 inches wide, a twin XL is still a one-sleeper mattress, the same as a standard twin. The extra length does not add any shoulder room, so it solves a height problem specifically, not a two-person sleeping problem.
How does a twin XL compare on size to a twin and a full?
| Size | Width | Length | Common fit |
|---|---|---|---|
| Twin | 38 in | 75 in | One sleeper up to about 69 to 71 in tall |
| Twin XL | 38 in | 80 in | One sleeper up to about 74 to 76 in tall |
| Full | 54 in | 75 in | One sleeper who wants more width than length |
Industry standard
These are standard published dimensions, the same across manufacturers.
Which twin XL mattress costs the least?
The two lowest-priced true twin XL mattresses in this catalog, both 8 inches and both under $120.
Novilla Twin XL Mattress
$96.99An 8 inch twin XL with a manufacturer-described cooling feature, at $96.99, the least expensive twin XL in this catalog.
Best for: Dorm-room budgets or a first bed for a taller kid
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NapQueen 8 Inch Twin-XL Size Mattress
$117.00An 8 inch twin XL memory foam mattress at $117.00.
Best for: Shoppers comparing a second budget brand at the same 8 inch thickness
Check price on AmazonWhich twin XL adds thickness, and is a standard twin enough instead?
The thicker true twin XL in this catalog, plus an honest look at a standard twin for anyone whose sleeper does not actually need the extra 5 inches.
Zinus 12 Inch Twin XL Green Tea Memory Foam Mattress
$198.67A 12 inch twin XL with a medium firm feel as the maker describes it, at $198.67, 4 inches thicker than the Beginner picks.
Best for: A single sleeper who wants extra cushioning depth in twin XL
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EGOHOME 8 Inch Twin Mattress
$109.99Not a twin XL: this standard twin at $109.99 has the same medium firm feel and a similar feature list, but is 5 inches shorter, worth checking if the sleeper is under about 69 to 71 inches tall and does not need the extra length.
Best for: A shorter sleeper who does not need the extra 5 inches of length
Check price on AmazonWhich twin XL goes furthest on features, and when does a full make more sense?
The most feature-loaded true twin XL in this catalog, and an honest alternative for a single sleeper who would rather have width than length.
LETMOON Twin XL Mattress
$209.99A 12 inch twin XL hybrid with CertiPUR-US certified foam and a manufacturer-described cooling feature, at $209.99, the highest-priced twin XL in this catalog.
Best for: A single sleeper who wants a hybrid coil base with the most published features
Check price on Amazon
EGOHOME Full Size Memory Foam Mattress
$179.99Not a twin XL: a full at $179.99 is 16 inches wider (54 vs 38 inches) but 5 inches shorter (75 vs 80 inches), a better fit for a single sleeper who moves around more than they need extra leg room.
Best for: A single sleeper who values shoulder room over the extra 5 inches of length
Check price on AmazonWho should not buy this tier: Sleepers taller than about 71 inches who need the extra length a twin XL provides over a full; the full alternative above is 5 inches shorter and will feel tight at that height.
How do the 4 true twin XL mattresses compare on specs?
| Spec | Novilla Twin XL Mattress | Zinus 12 Inch Twin XL Green Tea Memory Foam Mattress | LETMOON Twin XL Mattress |
|---|---|---|---|
| Price | $96.99 | $198.67 | $209.99 |
| Size | Twin XL | Twin XL | Twin XL |
| Thickness | 8 in | 12 in | 12 in |
| Construction | Memory foam | Memory foam | Hybrid |
| Feel | - | Medium firm | - |
| Cooling | Manufacturer describes a cooling feature | - | Manufacturer describes a cooling feature |
| CertiPUR-US foam | - | - | Yes |
A dash means the manufacturer does not publish that figure for this product. We do not estimate it.
How we chose
We did not test any of these mattresses in person. Picks are researched from each manufacturer's own published thickness, stated firmness and price, plus the recurring themes in verified owner reviews. This catalog has only 4 mattresses built in the true twin XL size, all covered in the tiers above; where a tier used a standard twin or full as an alternative, it is marked clearly as a size swap rather than presented as a twin XL.
Frequently asked questions
What is the actual size of a twin XL mattress?
A standard twin XL mattress measures 38 inches wide by 80 inches long, the same 38 inch width as a standard twin but 5 inches longer. That extra length matches a queen or standard king, which is why twin XL is the common choice for taller teenagers, college dorms, and single adults who want more legroom than a standard twin provides.
Why do college dorms use twin XL instead of a standard twin?
College dorm rooms are typically small, so the narrow 38 inch width of a twin fits the space, but many students are taller than a standard twin's 75 inch length comfortably accommodates. Twin XL solves that by adding 5 inches of length without adding width, letting the mattress still fit a compact dorm room while accommodating a taller sleeper.
Can two twin XL mattresses be combined into a king?
Yes. Two twin XL mattresses placed side by side create a 76 by 80 inch footprint, identical to a single king mattress, in a configuration called a split king. This lets each side of the bed have its own mattress or firmness, which is useful on an adjustable base, but it requires a frame or base specifically built for a split layout rather than a standard king frame.
How many twin XL mattresses are actually available in this catalog?
Only 4 mattresses in this catalog are built in the true 38 by 80 inch twin XL size, ranging from 8 to 12 inches thick. That is fewer choices than queen or king, so a shopper who does not specifically need the extra length over a standard twin may find more options by also checking this catalog's twin or full-size picks.
Is twin XL better than full for a single adult?
It depends on the priority. Twin XL is narrower but 5 inches longer than a full, so it suits a taller sleeper better, while a full is 16 inches wider but 5 inches shorter, giving more room to move but less legroom. A single sleeper under about 6 foot who values space to spread out may prefer a full; a taller sleeper generally does better on twin XL.
How to read the numbers on this page. Standard mattress and bedding dimensions are industry-wide and the same across manufacturers. Guidance like replacement intervals, firmness by body weight and walking clearance is convention rather than a measured standard, and every table here says which it is. Where a manufacturer does not publish a figure we leave it out instead of estimating. This is not medical advice: a mattress is not a treatment for a medical condition, and persistent pain is a reason to see a clinician.