38″ × 80″ · The standard dorm size and the building block of a Split King
Twin XL Mattresses on Sale
A Twin XL is 38 inches wide and 80 inches long, five inches longer than a standard Twin. It is the size used in most college dorm rooms, and it is also the mattress that two-up adjustable base setups are built around.
The Twin XL mattresses listed here are authentic luxury showroom and closeout models, so you can get a better mattress than the usual dorm option for far less than retail.
- Dimensions
- 38″ × 80″
- Room size
- About 7 × 10 ft or larger
- In stock now
- 12 listings
Twin XL mattresses in stock
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TEMPUR-ProAdapt Soft 2.0
TEMPUR-ProAdapt Soft 2.0 Twin XL
TEMPUR-ActiveBreeze Medium Hybrid 2.0
TEMPUR-ActiveBreeze Medium Hybrid 2.0 Twin XL
TEMPUR-LuxeBreeze Soft 2.0
TEMPUR-LuxeBreeze Soft 2.0 Twin XL
TEMPUR-ProBreeze Medium Contour 2.0
TEMPUR-ProBreeze Medium Contour 2.0 Twin XL
Beautyrest Black Series 2 Pillow Top
Beautyrest Black Series 2 Pillow Top Twin XL
TEMPUR-LuxeAdapt Medium Hybrid 2.0
TEMPUR-LuxeAdapt Medium Hybrid 2.0 Twin XL
TEMPUR-LuxeBreeze Soft 1.0
TEMPUR-LuxeBreeze Soft 1.0 Twin XL
Beautyrest Black Series 3 Firm
Beautyrest Black Series 3 Firm Twin XL
TEMPUR-ProAdapt Firm 1.0
TEMPUR-ProAdapt Firm 1.0 Twin XL
TEMPUR-Adapt Medium 2.0
TEMPUR-Adapt Medium 2.0 Twin XL
TEMPUR-ProBreeze Hybrid 1.0
TEMPUR-ProBreeze Hybrid 1.0 Twin XL
TEMPUR-ProAdapt Firm 2.0
TEMPUR-ProAdapt Firm 2.0 Twin XL
Twin XL for college and small rooms
Most dorm beds are Twin XL, which is why college bedding is sold under that label. Check your school housing guide for the exact mattress size before you order, since a few rooms use other sizes.
A Twin XL also works well for a single adult in a small bedroom, a guest room, or a daybed, and for tall teens who have outgrown a standard Twin.
Twin XL and adjustable bases
Two Twin XL mattresses side by side measure the same as a King (76 by 80 inches). Couples who want independent adjustable-base control choose that setup, often called a Split King.
If you plan to buy a pair, make sure both mattresses are the same model and firmness so the surface feels continuous in the middle.
Frequently asked questions
What are the dimensions of a Twin XL mattress?
A Twin XL is 38 inches wide by 80 inches long, about 3 feet 2 inches by 6 feet 8 inches.
Is a Twin XL the same as a dorm bed?
Most US college dorm beds are Twin XL, but some use other sizes, so confirm with your school before ordering.
Can two Twin XLs make a King?
Yes. Two Twin XL mattresses side by side are 76 by 80 inches, the same footprint as a King. This is the Split King setup used with dual adjustable bases.
Do you deliver to dorms and apartments?
We deliver across the Mid-Atlantic by route. For dorms and apartments, send the address and any building access rules, such as elevator hours, and we will plan the delivery.
Compare other sizes
Helpful guides
- Mattress Size Guide: Dimensions, Room Sizes and How to ChoosePicking the wrong size is the most expensive mattress mistake. Here are the real dimensions, room requirements and who each size suits.
- How Long Do Mattresses Last? Signs It Is Time to Replace YoursMost mattresses last about 7 to 10 years, but quality, weight and care change that. Here is how to tell when yours is done.