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Twin XL Mattresses

Shop award-winning twin xl size foam mattresses for great sleep, at an even greater price.


Foam Mattress


Better sleep starts with One.
Price: $1,245 Sale Price: $930


Hybrid Mattress


Dreamy ergonomic comfort.
Price: $1,875 Sale Price: $1,405


Hybrid Mattress


Cooler sleep. All night.
Price: $2,495 Sale Price: $1,870

Dream Max

Hybrid Mattress


The ultimate ergonomic support.
Price: $3,125 Sale Price: $2,340

Snow Max

Hybrid Mattress


Maximum support. Coolest sleep. All night.
Price: $3,745 Sale Price: $2,805

How big is a Twin XL size mattress?

A Twin XL size mattress is 80 inches long and 38 inches wide.

Mattress sizing chart

Twin Mattress - 38" x 75"

Often found in kid's rooms and studio apartments.

Twin XL Mattress - 38" x 80"

Often found in college dorm rooms and studio apartments

Full Mattress - 53" x 75"

Often found in guest rooms.

Queen Mattress - 60" x 80"

Often found in master bedrooms.

King Mattress - 76" x 80"

Often found in extra large master bedrooms.

California King Mattress - 72" x 84"

Often found in extra large master bedrooms, perfect for gathering the family.

Supreme comfort for truly astonishing sleep

Casper's Twin XL foam mattresses delivers cloud-like softness and support you’ll never want to go without. At 38 in wide and 80 in long, it’s 5 in longer than a standard Twin. You can combine two Twin XL mattresses on a standard King-size bed frame.

Cooler sleep, better sleep

The Original Twin XL mattress is built from breathable, open-cell memory foam that allows excess heat to escape. Staying cool at night is essential for deep, rejuvenating sleep - and it’s made possible with the premium-quality, proprietary Casper foam.

Certified safe for you and the environment

our Casper Twin XL size mattress is manufactured from safe, non-toxic materials. All of our foams are CertiPUR-US® certified, meaning they’re made without ozone depleting chemicals and regulated by the Consumer Product Safety Commission Low VOC.

Free shipping. Free returns. Hassle not included.

Order your Twin XL mattress, and it’ll be on your doorstep within a few days. Try sleeping on it for up to 100 nights. If you don’t love it, and give you a full refund anytime after the 30-Night Adjustment Period.

Twin XL Hybrid Mattresses

Discover the pinnacle of luxury and convenience with our Twin XL size hybrid mattresses. Fusing the adaptable resilience of coil springs with the rich softness of memory foam, these mattresses are designed to align with your body while providing gentle elevation. Our thoughtful design emphasizes fluid air circulation, guaranteeing a cool sleep. Dive in below and experience the perfect amalgamation of comfort, support, and advanced cooling – all crafted to enhance your sleep experience.

Snow Max
Wave Hybrid Mattress

Snow Max

Our ultimate cooling hybrid mattress. Engineered with precision-cut foam and encased coils for a breathable and supportive medium-soft feel and Snow Technology for 12+ hours of cooler sleep.

Dream Max

Dream Max

Our ultimate hybrid mattress with precision-cut foam and encased coils. Engineered with a gooey yet supportive medium-soft feel perfect for any sleep style—especially side sleepers.

Dream Hybrid Mattress


Our hybrid mattress pairs responsive foam with traditional encased coils. Designed with a gooey-medium feel that’s perfect for any sleep style—especially side sleepers.

Twin XL Memory Foam Mattresses

Step into the oasis of serenity with our twin XL memory foam mattresses. Expertly crafted with cutting-edge memory foam mattress technology, these mattresses are an invitation to a realm where every curve of your body is gently embraced, aligning your back and alleviating daily stresses as you lie down. Our memory foam mattress selections promise a harmonious blend of enveloping warmth and refreshing coolness. Dive in below and find your sanctuary of sleep that meets your distinct comfort needs.

The Original


The One was engineered using feedback and data from customers like you. If sleeping on a cloud sounds good, consider this your sweet spot.

Memory Foam vs. Hybrid Twin XL Mattresses

Twin XL memory foam mattresses stand out for their outstanding body-adaptive qualities and movement segregation, ensuring each sleeper feels nestled all night. These offer a sleep experience tailored to your body, enhancing pressure point relief.

On the other hand, hybrid mattresses take things up a notch by combining the unrivaled plushness of memory foam with the durable bounce of springs. This synergy results in a mattress that provides the warm embrace of memory foam while delivering improved air circulation, premium edge reinforcement, and a touch of bounce.

Interested in diving deeper? Explore our detailed memory foam vs. hybrid mattresses guide.

Frequently Asked

Standard twin xl bed mattress dimensions measure 38 inches wide and 80 inches long. The longer size of this single bed makes it an easy pick for college dorm rooms, studio apartments, or a split-king setup.

twin XL mattress is a comparable bed to a twin mattress but the main difference is that a twin XL has an added 5 inches of length and therefore measures 38 x 80 inches altogether. You’ll also find this type of twin size mattress in college dorms, as well as some apartment and condominium bedrooms.

Learn more in our guide on Twin vs Twin XL.

A twin bed may feel too cramped for an adult to sleep comfortably in, therefore a different mattress size, like a twin xl or full may be better. However, it all depends on your sleeping needs and living space.

Historically, twin beds weren’t made for the average adult. They were sold in pairs for children’s rooms, hostels, and other co-living spaces. While twin beds work well for kids, they tend to be too small for grownups, especially larger individuals and restless sleepers.

For very small bedrooms, however, a twin bed may be necessary to save space. In that case, the least you can do to maximize your comfort is to upgrade to a Casper twin mattress in a box.

Most bunk beds are designed for twin mattresses, so the answer is usually yes— it makes for a great bunk bed mattress size! However, some bunk bed models accommodate a twin XL mattress (38 x 80 inches), and others have varied upper and lower bunks, usually with a twin on top and a double bed on the bottom. Before purchasing, make sure to double-check all bed frame dimensions.

How Casper keeps prices low and quality high

When Casper was founded in 2014, many people were skeptical. Would consumers really buy a standard king size mattress without testing it first? Several years and numerous awards later, we have an answer: It turns out no one likes visiting stuffy mattress showrooms to make high-stakes purchases under the scrutiny of needy salespeople. (Who knew??)

Everyone loves the ease and convenience of buying online from a trusted source, and having a high-quality mattress shipped in a box to their doorstep. And people keep spreading the word that our mattresses deliver unparalleled comfort and support, top-notch construction quality, and high-tech, innovative design.

But the Casper experience isn’t just about quality, trust, and transparency. Our mattresses are a mere fraction of other brands’ prices. That’s because we’ve flipped the mattress industry on its head. By eliminating showrooms and middlemen, we keep our costs low - and pass those savings on directly to you.