Fact checked by Jonathan Eilenberg, CPE
Jonathan Eilenberg, CPE
Jonathan Eilenberg is a Certified Professional Ergonomist who is a Senior Ergonomics Engineer at Casper with over 6 years of experience in occupational injury prevention.
A twin XL mattress measures 38 inches wide by 80 inches long, while a split king mattress is essentially two twin XL mattresses placed side by side, measuring 76 inches wide by 80 inches long total.
If it’s been a while since you dipped your toes into the wonderful world of mattress shopping, welcome back, it’s cozy here. But no one would blame you if your return came with a little bit of confusion — last you looked there were only twin mattresses and king mattresses. Now, there are long lists of specialty sizes that might make you wonder if you’re dreaming.
Pinch yourself. Now that you’ve confirmed you’re wide awake, it’s only natural you have a few questions. Like, what is a twin XL mattress? Or, even more confounding, a split king for that matter? And what exactly is the difference?
Consider this guide your modern manifesto on these two mattress sizes: we’re taking you deep into the dream world of twin XL vs split king mattresses and who they’re best for.
You might have guessed the answer to this one — or at least got the basic idea right when you guessed the twin XL mattress is much like the twin, only a bit bigger. A twin XL is a compact mattress similar to a twin mattress with one key difference: its length.1
While both twin and twin XL mattresses share the same measurements side to side, the twin XL offers an additional five inches in length for those sleepers who desire a dash more legroom with their afternoon nap. Let’s further acquaint you with the twin XL mattress by going beyond the basics: what are its pros and cons?
The twin XL size may be lesser known than the mattresses that frequent most bedrooms, like a king or queen. But mattress aficionados will know it provides any sleep space with a particular set of pros. The twin XL measures 38” wide and 80” inches long.1 Its extra inches at the end make this mattress ideal for1:
Whether or not a mattress is right for you depends on the size of your sleep space and your unique sleep needs. With that in mind, the twin XL size may come with a few cons for a certain sleeper including1:
You may be wondering why a split king mattress and a twin XL mattress are being discussed in the same guide — aren’t they two vastly different mattresses when it comes to size?
Well, not exactly: a split king mattress is essentially a king mattress, just split down the middle.2
If the picture of this mattress in your mind’s eye is a little blurry, think of it as two twin XL mattresses pushed together. Typically, each twin XL mattress is placed side by side on a king bed frame, connected closely enough to look and function like a normal king mattress.2
The split king’s mattress measurements match a standard king’s too — at 80” long, with the width of each mattress adding up to 76” wide, a split king brings all the benefits of a king mattress to the bedroom when it comes to size and splay space, with additional adaptability.2 Let’s dig a little deeper into the pros of a split king.
Much like the twin XL mattress, the split king mattress is ideal for sleepers whose setup requires a more specialized mattress size. The pros of a split king are just as apparent as its size, including2:
But even the best mattress for you is not without its drawbacks.
Despite its ample size and adaptability, the split king mattress may pose a few challenges. Here are some cons to consider when contemplating whether to purchase a split king mattress2:
Yes, split California king mattresses are available from several manufacturers. Split Cal king mattresses consist of two separate mattresses, each measuring 36 inches wide by 84 inches long. When placed side by side, they form a complete California king size bed of 72 inches wide by 84 inches long.
When shopping for a split California king mattress, consider factors like firmness level, material, cooling properties, and whether it’s compatible with an adjustable base if you plan to use one.
Now, for the answer to the question you’ve been most curious about. Who are these specialty mattress sizes for? And are they right for my sleep space?
A Twin XL bed is a versatile choice for various scenarios, particularly for individual sleepers. Here are the primary reasons to choose a Twin XL bed:
A Twin XL bed is suited for single sleepers, college students, guest rooms, children, and those seeking a budget-friendly option. It provides the necessary comfort and space efficiency for various living situations.
At Casper, comfort is key regardless of size. Choose from a collection of twin XL mattresses that save space but don’t sacrifice the solace of a good night’s sleep.
For ultimate comfort, try the Dream Max. Designed with multiple layers from top to bottom, a cozy cover and breathable flex foam start easing you into a relaxed state the moment you hit the hay. But that’s not all: memory foam and flex coils provide deeper support for a dreamy sleep that lasts till morning.
Choosing a split king bed often ends the heated household debate on which mattress to buy. Because the split king is technically two mattresses joined together by a king bed frame, you can choose a style and feel that’s best for you — and so can your bedfellow. Here are some specific reasons to choose a Split King bed:
If you and your sleep partner have variable sleep needs then this bed is best for you. Are you ready to redesign how you sleep but unsure where to start? You’re in the right place.
Put an end to the bedtime bickering over mattress styles with Casper. If your partner prefers a simple setup with all the fundamentals that make a good night’s sleep, start with The One. This medium-firm affordable mattress supplies support you can feel. With three layers of breathable foam and a bit of bounce, their body will be thanking them in the morning.
But if you sleep best with more supple support, there’s a mattress for you, too. The Dream hybrid memory foam mattress is engineered from hybrid technology to reduce sleep disturbance and ease tossing and turning. Additional support in the center of the mattress cushions your hips, waist, and lower back so you and your partner wake up on the right side of the bed.
Yes, twin XL sheets fit a split king bed as easily as an XL. Simply fit the individual bed sheets over each side of the bed and voilà: you’re ready to experience the comfortable, custom sleep you’ve been craving.
But wait — since we’re on the topic of comfort, let’s address the question dividing the room. Or more accurately, splitting the bed.
At Casper, we know the comfortability of your mattress is key to deep, dreamy sleep. And just like your preferred mattress style, the design of your bed frame, or the pattern on your pillowcases, comfort can be subjective.
So, when it comes to whether or not you can feel the split in a split king mattress, the answer isn’t a simple yes or no. It depends on a few factors:
If you are a sensitive sleeper concerned the divide may affect your sleep cycle, don’t lose Zs over it just yet — easily address any sensory needs by adding a mattress topper to your mattress.
Our Comfy Mattress Topper is made from perforated memory foam that keeps you cool while cradling every nook and cranny. A quilted knit cover seamlessly pairs with your mattress to complete the look for maximum sleep style and comfort.
In the modern world of mattresses, there’s an option for everyone. When it comes to choosing a split king vs twin XL mattress, it’s important to consider the size of your sleep space and your unique sleep needs to determine the best mattress for you.
Still stuck on which mattress to choose? Here at Casper, each mattress is mindfully designed and obsessively engineered to solve every sleep problem, no matter how small — or big for that matter.
Let us simplify the process. Our collection of mattresses offers ease for every sleeper, from a medium-firm feel to maximum memory foam support, to breathable top layers that keep you cool. Choose your mattress wisely, and sleep deeply with Casper.
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