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A split king mattress is made of two twin XL mattresses, each 38" x 80", placed side by side. It gives couples all the space of a standard king mattress (76" x 80") while letting each person choose their preferred firmness level on their side of the bed. Shop the best split king mattresses at Turmerry! Made with GOLS-certified organic latex, they're affordable, compatible with adjustable bases, and built to last well over a decade. Every order comes with free shipping and a 120-night trial.
Note: In our split king mattresses, only the latex layers inside the mattress cover are split in half. The cover itself isn't split.
Want help finding the best split king mattress for you? Try our personalized mattress quiz.
A split king mattress is two twin XL mattresses, each 38 inches wide and 80 inches long, placed side by side in a shared king size bed frame. Each half can be customized independently, so two partners with different comfort needs don't have to settle for a compromise.
The split king is highly recommended for couples where one person needs a firm mattress and the other needs something softer, or where one sleeps hot and the other doesn't. Each side of the bed operates on its own, and each partner gets a full 38 inches of space to themselves, which is the equivalent of a twin XL.
It requires the same floor space as a standard king, so you're not giving up any room to get the customization. The main trade-off is the seam running down the middle, which some couples notice and others don't.
Here's a table to help you compare split king mattresses with other mattress sizes:
| Mattress Size | Dimensions (W x L) | Best For |
|---|---|---|
| Split King | 76 x 80 inches (38 x 80 inches on each side) |
Couples with different sleep preferences, couples on split king adjustable bed frames |
| Twin | 38 x 75 inches | Toddlers, young kids, bunk beds, daybeds, small guest rooms |
| Twin XL | 38 x 80 inches | Tall teenagers, college dorms, single adults over 6 feet tall, split king setups |
| Full | 54 x 75 inches | Solo sleepers who want extra room to spread out, growing teens, guest rooms |
| Queen | 60 x 80 inches | Couples, solo sleepers who like extra space, standard master bedrooms (most popular size) |
| Split Queen | 60 x 80 inches (30 x 80 inches on each side) |
Couples with different sleep preferences, couples on split queen adjustable bed frames |
| King | 76 x 80 inches | Couples who want maximum personal space, families who co-sleep with kids/pets |
| California King | 72 x 84 inches | Tall couples (over 6 feet) who prioritize extra legroom |
| Split Cal King | 72 x 84 inches (36 x 84 inches on each side) |
Couples with different sleep preferences, couples on split Cal king adjustable bed frames |
You should buy a split king mattress if:
A split California king mattress is recommended for taller sleepers. If you and your partner are on the same page about firmness, a standard king mattress is the simpler choice and will cost less, too. If you want the same customization in a smaller size, a split queen mattress covers 30 inches on each side without needing a larger bedroom.
Turmerry mattresses are made with high-quality materials, including certified organic latex, cotton, wool, and pocketed coils. With benefits ranging from responsive support and contouring pressure relief to breathable cooling, they're some of the best split king mattresses you can find today.
Note: In our split king mattresses, only the latex layers inside the mattress cover are split in half. The cover itself isn't split.
Latex responds to your movements instantly, pushing back as you shift positions. Turmerry mattresses are built with 7-zone support, firmer under heavier areas like the hips and lower back, softer under lighter areas like the shoulders and thighs. Your spine stays aligned through the night without any single pressure point taking too much load.
Latex contours closely to the shape of your body, distributing weight evenly across the surface. This reduces pressure buildup at the shoulders and hips, which is especially useful for side sleepers who concentrate weight through those areas for hours at a time.
Latex has an open-cell structure that lets air move through it, and our perforated layers improve this further. The wool layer wicks moisture and buffers heat, keeping you warmer in winter and cooler in summer without synthetic cooling additives.
With a split king, motion isolation is even less of a concern than on a standard king. Each half is separate, so whatever is happening on one side of the bed stays on that side. The edges hold up well too, as Dunlop latex is dense enough to stay firm at the borders. Each person gets the full 38 inches of their side without the edges giving way.
Dunlop latex doesn't sag the way memory foam and polyfoam do. A well-maintained Turmerry mattress lasts well over a decade, making it a better long-term investment than cheaper options that need replacing every few years.
Latex is naturally resistant to dust mites, mold, and mildew. Combined with the organic cotton and wool cover, Turmerry's split king mattresses are a good fit for anyone with allergies or chemical sensitivities.
Turmerry mattresses carry GOLS and OEKO-TEX certifications for the organic latex, GOTS for the organic cotton, and LGA for overall quality. Every certification is third-party verified, confirming the materials are free from harmful substances and built to last.
Every split king mattress ships free across the US and comes with a 120-night sleep trial. That's enough time to know whether the mattress is genuinely working for you or not.
A split king takes up the same floor space as a standard king, so you'll need at least 12 x 12 feet to move around comfortably. If you're adding other furniture alongside it, plan for more than the minimum.
Split king mattresses are priced similarly to standard kings, though you may pay a small premium for the split configuration. Basic models cost around $800 to $2,000. Premium latex and hybrid models start around $1,600 and go up to $2,800 or more. Turmerry's organic latex split king mattresses start at $1,999, putting them at the lower end of the premium range for materials that outlast memory foam by years.
Standard king sheets will fit a split king well. But if each partner wants fully independent bedding on their own side, you'll need two sets of twin XL sheets instead, one for each half.
These are the four most popular split king mattress types you'll find on the market:
Latex mattresses are made from natural or synthetic rubber. Natural Dunlop latex (what we use in our own mattresses) is the most durable of the four. It's dense, responsive, and built to last for well over a decade. It also sleeps cooler than memory foam and contours closely for pressure relief. Plus, it's naturally hypoallergenic. The upfront cost is higher than the other materials, but the lifespan makes latex the best long-term value by a wide margin.
Memory foam molds to the body and does a good job of relieving pressure, which is why it's popular with side sleepers. The trade-offs are impactful for many, though. It retains heat, makes changing positions feel sluggish, and breaks down faster than latex. Memory foam is workable on a short-term budget, but not a great long-term investment.
Hybrid mattresses combine a pocketed coil base with a latex or memory foam comfort layer on top. The coils improve airflow and add bounce, while the comfort layer takes care of cushioning and pressure relief. A good middle ground for sleepers who want contouring without giving up edge support or breathability. More durable than memory foam, though heavier and pricier.
Innerspring mattresses use interconnected coils (like Bonnell or offset), with thin comfort layers on top. They're the most affordable of the four and the most traditional in construction. The downsides are minimal pressure relief, poor motion isolation, and a shorter lifespan compared to latex and hybrid options.
Consider all of these factors before finalizing your purchase:
With a split king, each side is set to its own firmness level, so you only need to worry about what works for you. Side sleepers need a softer feel to cushion the shoulders and hips. Back sleepers do best on medium-firm. Stomach sleepers need something firm enough to keep the hips from sinking. Body weight plays a role too. Lighter sleepers need softer cushioning, while heavier sleepers need firmer support.
Around 10 to 12 inches works well for most couples on a split king. Heavier sleepers should lean toward the thicker end to get adequate support through the base layers. Thickness also affects how easy it is to get in and out of bed, which is worth keeping in mind for older sleepers.
Natural latex stays supportive for 15 to 20 years without sagging. Memory foam contours closely but traps heat and breaks down faster. Hybrids pair pocketed coils with a memory foam or latex comfort layer for better airflow and edge support than all-foam. Innerspring is the most affordable but wears out fastest and offers the least pressure relief.
Go for naturally breathable materials like latex and cotton if heat is a concern. A split king means two people generating heat across a wide surface, so prioritize temperature regulation. Alongside latex, innerspring and hybrid mattresses are also good at cooling thanks to the coil layer. Wool can help further by wicking moisture away through the night. Memory foam is the worst choice for hot sleepers unless it has cooling gel built in.
Split king mattresses are priced similarly to regular kings, with good, high-quality options starting around $1,200 to $2,000. Factor in a compatible bed frame and bedding on top of the mattress cost. If each partner wants their own bedding, budget for two sets of twin XL sheets instead of standard king sheets.
A split king handles motion isolation better than any standard mattress since each half is completely separate. Within each side, latex and memory foam absorb movement really well. Pocketed coils in a hybrid help too. Interconnected innerspring coils transfer motion across the whole surface, so it's best to avoid them if you want good motion isolation.
Strong edge support lets both partners use the full 38 inches of their side without the borders giving away. Latex holds its shape at the edges due to its density. Hybrids with reinforced perimeter coils do this even better. Memory foam compresses at the edges under body weight, so keep that in mind if you tend to sleep close to the side.
A split king sees two sleepers every night, so the materials need to be sturdy. Latex lasts 15 to 20 years, as it responds to pressure quickly. Quality hybrids last for 8 to 10 years. Memory foam and innerspring mattresses typically start sagging within 5 to 7 years. If you're looking at an all-foam option, check the base foam density since low-density foam breaks down faster under regular use.
A split king is one of the biggest mattress investments you can make, so use the trial period properly. Look for at least 60 to 90 nights. Ten years is a reasonable warranty baseline for latex and hybrid mattresses. Read the fine print before buying since coverage varies quite a bit between brands.
Filter for reviewers with a similar body type and sleep position to yours. A review from a 130-lb side sleeper won't tell you much if you're a 220-lb back sleeper. Reviews from people who've owned the mattress for two or more years are the most useful since that's when durability issues show up in lower-quality models.
The right bedding makes a real difference in how your split king mattress feels night to night. Here's what we recommend:
A sturdy base keeps both halves of your split king supported evenly. Platform bed frames work best for latex, memory foam, and hybrid mattresses. Make sure the slats are no more than 3 inches apart so neither half dips between them.
A topper can adjust the feel of one or both sides without replacing the mattress below. Two to three inches is enough to make a notable difference without raising the bed too high.
A mattress pad adds a thin layer of cushioning and protects the surface from daily wear. It won't change the feel much, but it keeps the mattress cleaner for longer.
Two people on the same mattress means twice the sweat, body oils, and chances of spillage. A waterproof protector keeps all of that out of the mattress and keeps your warranty coverage intact too.
Standard king sheets fit the full size of a split king without any issues. If each partner wants their own bedding, two sets of twin XL sheets work instead, one for each half. Cotton is a solid choice that gets softer with every wash.
If you and your partner sleep at different temperatures, a wool comforter is a good middle ground. It regulates naturally without overheating either side. Some couples on a split king prefer two separate twin XL comforters so each person has full control over their own.
A duvet cover protects your comforter and simplifies upkeep. Pull it off and toss it in the wash regularly instead of cleaning the comforter itself every time.
