Question 1

What is the difference between a twin and a Twin XL mattress?

Accepted Answer

A twin mattress measures 38" × 75". A Twin XL measures 38" × 80"  -  the same width but 5 inches longer. That 5-inch difference is the entire reason the Twin XL exists: it accommodates sleepers who are 6 feet tall or taller who would otherwise have their feet hanging off a standard twin. The two sizes are the same width, so they fit the same bed frames, and Twin XL sheets are the same width as twin sheets (just longer). If the person sleeping on it is under 6 feet tall, a standard twin works fine. If they are 6' or taller, Twin XL is the right call.

Question 2

What are Twin XL mattress dimensions?

Accepted Answer

A Twin XL mattress measures 38 inches wide by 80 inches long  -  that is 3 feet 2 inches wide and 6 feet 8 inches long. It is the same length as a queen or king mattress, just significantly narrower. The minimum room size for a Twin XL is approximately 7′×10′. A recommended room size is 8′×10′, which gives you walking clearance on both sides and space for a nightstand. Twin XL is the standard size for most U.S. college dormitory beds.

Question 3

Is a Twin XL good for an adjustable base?

Accepted Answer

Yes  -  Twin XL is specifically designed for adjustable base use. The most common adjustable base configuration for couples is a split king: two Twin XL mattresses placed side by side on a split king adjustable frame. This setup lets each person control their own head and foot position independently. Because the Twin XL is exactly half the width of a king (38" + 38" = 76"), the fit is precise. Most major adjustable base brands  -  including Tempur-Pedic  -  size their split king bases to accept two standard Twin XL mattresses. If you are buying a Twin XL for an adjustable base, choose a flexible foam or hybrid  -  not a rigid innerspring  -  for best compatibility.

Question 4

Is a Twin XL the right size for a college dorm?

Accepted Answer

Almost certainly yes. The Twin XL is the standard dorm mattress size in the United States. Most college and university dormitory bed frames are built to hold a 38" × 80" mattress. Before ordering, confirm your dorm's bed dimensions with your housing office  -  a small number of older dorms still use standard twin (38" × 75") frames. For most students, a Twin XL mattress is the correct purchase. We carry Twin XL mattresses at every price point from $439, including options thin enough for dorm bunk frames.

Question 5

Do two Twin XL mattresses make a king?

Accepted Answer

Yes. Two standard Twin XL mattresses placed side by side measure 76" × 80"  -  exactly the same dimensions as a standard king mattress. This is a popular configuration for couples who want different firmness levels, different materials, or the ability to use a split king adjustable base. Each person can choose their own mattress independently. A bed bridge or split king connector keeps the two mattresses from separating during the night, and standard king sheets (which are oversized) fit over both mattresses together. The only limitation is that a split king requires a king-size bed frame or adjustable base.

Question 6

How much does a Twin XL mattress cost?

Accepted Answer

At LA Mattress Store, Twin XL mattresses range from $439 for a quality foam or innerspring to $5,199 for a Tempur-Pedic LuxeAdapt or Stearns & Foster Estate tier in Twin XL size. The best value range for most shoppers is $599-$1,299, where you find strong hybrid options. For a luxury Twin XL  -  typically used in a split king adjustable base setup  -  $1,500-$2,500 covers the top tier from most premium brands. All Twin XL mattresses include free delivery and our 120-night sleep trial.

Question 7

What is the best firmness for a Twin XL mattress?

Accepted Answer

Firmness depends on sleep position and body weight. Side sleepers typically need plush to medium-soft for hip and shoulder pressure relief. Back sleepers do best with medium to medium-firm for lumbar support. Stomach sleepers need firm to extra-firm to keep the hips from sinking. For college dorm use, medium is the most versatile choice  -  it works for most sleep positions and adjusts to a range of body types. For an adjustable base, medium to medium-firm is generally recommended as a starting point. We carry Twin XL mattresses in plush, medium, firm, and extra firm.

Question 8

Twin XL vs full mattress  -  which should I choose?

Accepted Answer

The choice between Twin XL and full comes down to width vs length. A Twin XL is 38" wide and 80" long. A full is 54" wide and 75" long. Twin XL is 16 inches narrower but 5 inches longer than a full. For a tall sleeper (6' or over) who sleeps alone and does not need much width, Twin XL is the better fit. For a shorter sleeper who moves around at night and wants more room to spread out, a full provides significantly more surface area. Twin XL also makes sense for dorm beds and split king setups  -  situations where a full is not practical.

Question 9

What room size do I need for a Twin XL mattress?

Accepted Answer

The minimum room size for a Twin XL mattress is approximately 7′×10′. At that size, you will have a few inches of clearance at the foot of the bed and on each side. The recommended room size is 8′×10′  -  that gives you roughly 24" of walking clearance on one side (the other can be against a wall), space for a nightstand, and a dresser opposite. The Twin XL's narrow 38" width makes it one of the easiest mattress sizes to fit in tight spaces, including dorm rooms, small bedrooms, and guest rooms.

Question 10

Can I try Twin XL mattresses in person at LA Mattress Store?

Accepted Answer

Yes. We carry 126 Twin XL mattresses across 9+ brands and have a strong selection available to try in person at our Los Angeles showrooms. This matters especially for adjustable base shoppers  -  we recommend testing your Twin XL mattress on an adjustable base before buying to confirm the flex and feel you want. All 5 of our LA showrooms carry Twin XL options from Tempur-Pedic, Stearns & Foster, Helix, and more. Mon-Sat 10am-8pm, Sun 10am-8pm. No appointment needed.

Question 11

Does LA Mattress Store offer free delivery on Twin XL mattresses?

Accepted Answer

Yes. All Twin XL mattresses come with free delivery. We also offer White Glove delivery on select orders  -  our team delivers, unpacks, sets up the mattress on your frame or adjustable base, and removes your old mattress at no charge. Every Twin XL mattress is backed by our 120-night sleep trial and 0% APR financing. Call us at (800) 218-3578 or visit any of our 5 LA showrooms.

Question 12

Does LA Mattress Store carry Twin XL mattresses in stock?

Accepted Answer

Yes. We carry a deep selection of Twin XL mattresses across 9+ brands, including Tempur-Pedic, Stearns & Foster, Helix, Eastman House, Englander, Diamond, and Spring Air. All major models are available to try in person at our 5 Los Angeles showrooms. Free delivery available 7 days a week, with White Glove service included on select orders. Call (800) 218-3578 or visit any showroom Mon-Sat 10am-8pm, Sun 10am-8pm.

Feature	Twin	You’re hereTwin XL	Full
Width	38"	38"	54"
Length	75"	80"	75"
vs Twin XL	5" shorter	-	5" shorter
Min room size	7′ × 9′	7′ × 10′	9′ × 10′
Recommended room	8′ × 10′	8′ × 10′	10′ × 10′
Best for	Kids, short adults	Tall teens, dorms, split king	Solo adults, smaller rooms
Price (LA)	From $299	From $439	From $379

Twin XL Mattresses

A Twin XL is 38″ wide × 80″ long.

Five ways to build a Twin XL.

Twin XL Hybrid

Twin XL Memory Foam

Twin XL Latex

Twin XL Innerspring

Twin XL Pillow Top

Top brands in Twin XL size.

Tempur-Pedic

Stearns & Foster

Helix

Every Twin XL mattress in stock.

Twin vs Twin XL vs Full.

Who a Twin XL is built for.

Taller teens and adults

College dorms

Adjustable base users

Split king half

Guest rooms

Test every Twin XL we carry, in person.