The Good Trade editors endorse products we’ve personally researched, tested, and genuinely love. We earn a commission when you purchase products or services through some of the links provided. Learn more about our methodology and business model here.

We’ve researched, tested, and slept on nontoxic mattresses and bed frames for years — these are our picks for split king mattresses that are organic, customizable, and supportive.

We all have different sleep needs. For couples, these differences can get frustrating when you share a bed. You want to feel close at night, but you don’t want to wake up with a sore back from the plush mattress your partner prefers, or vice versa.

Here’s where a split king mattress can save the day. Whether or not a brand offers a designated “split king” as one of the sizing options on a particular mattress, the difference is the same — a split king is always just two separate twin XL mattresses, which are typically 38 by 80 inches each, set next to each other on a king bed frame.

Split kings let you customize each side of your king bed — maybe you want medium firmness on your side while your partner wants firm support on their side. And not all firmness levels are created equal — how firm a mattress feels to you has a lot to do with your body weight, so mattresses aren’t usually a one-size-fits-both situation. What feels like a medium mattress to someone who’s 190 pounds might feel firm to someone who’s 120 pounds.

And because they’re technically two separate mattresses, split kings help prevent motion transfer between each side of the bed.

Read more about the benefits of split king mattresses and what to look for when shopping for one. When shopping for bedroom products, we always prioritize “clean” products made with natural materials. This is especially important for mattresses because we spend so much time in direct contact with our bedding.

Who should consider a split king mattress?

Split king mattresses are great for couples with differing comfort preferences, especially widely differing preferences — if one person likes plush and one likes firm — along with couples who have big differences in weight or who have distinct health or mobility needs.

Reduced motion transfer is another huge benefit — this is helpful for folks who are light sleepers or couples who have different sleep schedules.

If you have an adjustable bed frame (or are thinking of getting one), a split king might offer you even more customization. Some adjustable frames let you raise the bed separately, side by side, which you can’t take full advantage of until you have a split king.

Because a split king can come apart into two twin XL mattresses, they’re also great for people who live in tight spaces. They’re much easier to move with than conventional kings since they can better navigate staircases and tight corners — great for folks who live in small city apartments.

What should you look for when shopping for a split king mattress?

When shopping for split king mattresses, note that some brands will have specific “split king” options you can buy, and on some you’ll just need to purchase two twin XL mattresses and place them on the same base. If you’re buying a split king to get two different firmness levels on each side and you buy a brand’s designated “split king” option, make sure they let you customize each side’s firmness level. If they don’t, just buy two separate twins in different firmnesses.

You’ll want to measure your bedroom and your bed frame to confirm that the split king will fit in your space (each side of a split king is usually 38 by 80 inches). And, when mattresses shopping, always look for brands that offer trial periods or warranties.

Why consider a nontoxic and organic mattress?

We always look for products made of natural materials like latex, cotton, and wool rather than synthetic foams and fabrics when shopping for mattresses. We spend up to a third of our time practically face-to-face with our bedding, so it’s especially important to us that these products are made of natural materials that don’t offgas potentially harmful or irritating chemicals. And a natural product will break down fully at the end of its lifecycle, rather than breaking down into microplastics and toxic waste. When we do consider mattresses with synthetic materials, we always look for the CertiPUR-US label.

Our criteria:

Our editors have outfitted their bedrooms with nontoxic and organic mattresses and bed frames, researched certifications and interviewed brands, and even visited factories to determine the most supportive sleeping options for you. When selecting the best split king options for couples. We often revisit this guide to add new picks when they meet the criteria below.

• NONTOXIC & ORGANIC | Every mattress on this list has received rigorous certifications for safe materials and eco-friendly production; each brand’s specific certifications are listed in the icon section above their feature. None of the mattresses on this list contain harsh flame retardants, and all are free from toxic chemicals, PFAS, VOCs, and fiberglass.
• COMFORT | Comfort is key, so we try each mattress brand ourselves, spend hours scouring online reviews, and represent all the feedback from our readers that we collect through surveys, comments, and emails. The brands on this list are here because they are organic and we love to sleep on them.
• QUALITY & DURABILITY | Nothing second-rate here. We’ve selected brands that have a track record for making comfortable and supportive mattresses and bedframes, with warranties that guarantee their construction.

For more nontoxic bedroom goods, check out our guides to the best organic mattresses and organic bedding made of natural materials. And if you’re in the market for a new bedframe on which to place your two new twin XL mattresses, see our guides to wooden bedframes and upholstered bedframes — and adjustable bedframes, since some of these allow for even more customization for partners sharing a split king.

1. Avocado

Best For | Most certified sustainable split king
Features | Split king luxury organic plush mattress
Price | Starting at $3,168

One of the leaders in the clean bedding space, Avocado makes mattresses without polyurethane foams, chemical flame retardants, or fiberglass. Their bestselling Avocado Green Mattress is built with organic latex, wool, cotton, and up to 1,379 support coils, and it’s the most certified organic mattress on the market (B Corp, GOLS, GOTS, FSC, EWG…the list goes on). For a split king feel, they recommend buying two twin XL mattresses and placing them side by side. This way you can choose two different firmness levels on either side for different support needs — firm, medium, or plush. Avocado’s Luxury Organic Plush Mattress is one of its softer, more pressure-relieving options, made with 17 layers of organic and natural latex, wool, silk, hemp, and cotton. It comes in split king sizing, which makes it a strong choice for couples who want a softer surface but who still want a split king to minimize movement and heat transfer between both people during the night.

Customer Review | “Our Avocado bed is probably the most comfortable bed I have ever slept in. My husband has restless leg and kicks at night. We bought a split king, two XL twins shoved together, hoping it would help me sleep. It works! I don’t feel him kicking anymore. It is a firm mattress but it is a good firm. We got it with a pillow top. I highly recommend this bed for a good night’s sleep.” – Jennifer C. (Read more reviews.)

2. Saatva

Best For | Upper-flex kings
Features | Adjustable firmness mattresses, upper-flex king options
Price | Starting at $3,048

Saatva, one of the leaders in luxury mattresses and bedding products, makes split king versions of almost all of their mattress models (except their mattress designed specifically for Murphy beds). Their classic mattress is an innerspring with plenty of luxurious layers: a 3-inch pillowtop layer, a CertiPUR-US foam lumber support layer, and individually wrapped steel coils. It comes in both a split king and a split California king option. California kings are typically 4 inches narrower and 4 inches longer than a typical king, so it’s great for taller people — Saatva’s Solaire Adjustable Firmness Mattress (with 50 different firmness levels!) also comes in a split California king option. And their Solaire plus their Zenhaven Latex Mattress models come in upper-flex king options, so the upper half of the mattress is split so it can be propped up while you’re reading or watching TV.

3. Silk & Snow

Best For | Affordability
Features | Hybrid latex mattress, twin XL options, split king base
Price | Starting at $1,150

Silk & Snow creates high-end bedding products with conscious sourcing and manufacturing but at affordable price points. While none of their mattresses come in split king options, you can combine two twin XL mattresses on one base to create a split king — and their adjustable bed frame comes in a split king option in case you want to adjust the two halves of your bed differently. Silk & Snow’s standard mattress is a memory foam mattress — and because it goes for $550 for a twin, this brand is one of the most affordable on this list. The brand also makes a hybrid mattress made with both memory foam and innersprings, plus an organic version of the hybrid mattress that uses organic latex instead of memory foam.

Customer Review | “We love our twin XL hybrid mattresses. We purchased them for our new split king adjustable bed frame and the mattresses are a dream. Comfortable, soft enough to be plush but firm enough to provide solid support. We highly recommend Silk & Snow as a wonderful company to deal with as well. Dependable, excellent customer service and a solid, community minded business model.” – Margo C (Read more reviews.)

4. Birch

Best For | Breathability
Features | Natural materials, twin XL options
Price | Starting at $1,865

Birch is another brand that doesn’t manufacture a dedicated split king mattress — but you can achieve the same setup by placing two twin XL Birch mattresses side by side. And Birch is one of the most sustainable mattress options out there. Their best selling natural mattress is a hybrid latex/innerspring mattress crafted using natural latex, organic cotton, and ethically sourced wool, delivering breathable comfort with temperature regulation — natural materials are great for hot sleepers! The brand makes a few other mattress options, too — the essential mattress is their most affordable option (even though it’s also made with natural materials like latex, cotton, and steel coils) while the luxe natural mattress ups the luxury factor with layers of both firm and soft natural latex plus plenty of wool for loft and cushioning.

Customer Review | “We purchased the Birch mattresses along with the adjustable split king bases, and I can honestly say it has been a game changer. The adjustable bases are incredibly quiet, smooth, and easy to operate. The organic materials and latex interior make the bed exceptionally comfortable, and best of all, it does not aggravate my allergies.” – Tammy T (Read more reviews.)

5. Naturepedic

Best For | Non-split kings with different firmness levels on each side
Features | Natural materials, adjustable king mattresses
Price | Starting at $3,759

While Naturepedic doesn’t have a dedicated split king mattress, their premium EOS line gives a similar effect to a split king. In the EOS classic organic mattress, each side of the bed can be adjusted to different firmness levels for couples with conflicting sleep preferences. And if you want a true split king experience, the brand makes it easy — their EOS king layers lets you choose two separate twin XL mattresses in whatever firmness level you prefer. The EOS mattresses are hybrid models with innerspring coils, a comfort layer of latex, and a cotton and wool top layer for breathability. It also comes in a latex-free option and a vegan (wool-free) option. 

Customer Review | “Very comfortable. I like how it can be split into two different levels of firmness for each partner. It is a lot more comfortable than I was expecting a coil mattress to be. I feel a lot better sleeping on an all natural mattress that isn’t filled with chemicals. I noticed my breathing has been a lot better since sleeping on this mattress.” – Bmed29 (Read more reviews.)

6. Bear

Best For | Athletes
Features | CertiPUR-US foam, Celliant fabric
Price | Starting at $927

Bear’s mattresses are all assembled in the US and are made with CertiPUR-US foam — a certified clean synthetic foam. And they’ve been racking up editorial awards from places like The Strategist and CNET. Bear’s Elite Hybrid Mattress was named Wired’s best mattress for back pain — it’s a hybrid mattress with coils and several layers of foam for support and comfort (one layer is even infused with copper to pull heat away from the body). For an affordable, under-$1,000 split king, check out the brand’s Original Mattress, a memory foam mattress with firm, cushioning support. All of their mattresses come in split king options, and they all have a top layer of quilted Celliant fabric, which is designed to convert excess body heat into infrared energy, helping to increase local circulation—giving muscles a deeper overnight recovery boost.

Customer Review | “I chose the Bear mattress company because of the low off-gassing of the foam, non-toxic, and it is a US company. I was so impressed how much the mattress expanded once unboxed—much thicker than I could have predicted! I got it with the celliant infused cover. I sleep so well, and wake feeling very well rested. A worthwhile investment. The firmness is perfect for me, not like a board, but I also don’t sink in, just right.” – Pamela F. (Read more reviews.)

7. Plushbeds

Best For | Split queen options
Features | GOTS cotton and wool, GOLS latex, split California kind
Price | Starting at $3,219

All of Plushbeds’ luxury organic mattresses come in split king sizing options. And two of their mattresses, the Botanical Bliss (their best seller) and the Organic Bliss Pillowtop mattress, both of which are fully latex mattresses with great support and motion isolation, come in split California king and split queen options. The brand also makes a few hybrid mattresses with both latex and innerspring layers, and their Eco Bliss Mattress has both latex and memory foam and is their most affordable option. Plushbed’s luxe mattresses all have several layers of plushness and support, and they’re quite eco-friendly, with organic certifications like GOTS (organic cotton and wool), GOLS (organic latex), and Greenguard Gold (no harmful emissions/off-gassing). 

Customer Review | “Very pleased with the split king option. I was worried that the medium firm was going to be too firm. Slept on the medium side and the medium firm side and I can confirm that Medium Firm was perfect for me. My wife loves the softer side. Split King made this way too easy. No issues out of the product, delivery was good, hauled away the old one too.” – Jeremy R. (Read more reviews.)

8. MyGreenMattress

Best For | Mattresses made in the USA
Features | GOTS cotton and wool, GOLS latex, made in Illinois
Price | Starting at $1,938

MyGreenMattress makes two mattress models, either of which you can buy in two twin XLs to make a split king. They’re both made in the brand’s Illinois factory of innersprings, organic cotton, organic wool, and organic latex. The Kiwi Organic Mattress is the brand’s more affordable option, with a medium-firm feel, 2 inches of latex, and 1,256 coils in a 7-zone lumbar support system. Their Natural Escape Organic Mattress is more luxe, with 3 inches of Dunlop latex and 1,462 pocketed coil springs. The brand has tons of sustainability certifications, too, like Greenguard Gold, Made Safe, GOLS, and GOTS, and their products are free of flame retardant chemicals, polyurethane foams, and fiberglass.

9. Leesa

Best For | Hot sleepers
Features | GreenFlex plant based foam
Price | Starting at $2,052

Leesa’s mattresses use a material that’s a bit different than most mattresses — they have a layer made of GreenFlex foam, a plant-based foam that’s USDA-Certified Biobased Product and made with natural polyols from non-food crops. The GreenFlex foam is super breathable, and used at the top layer on the brand’s mattresses that also include memory foam and, in some cases, innersprings. Leesa mattresses have top cover layers designed to keep you cool, but in different ways — the Sapira Hybrid Mattress has a Cool Knit cover with viscose fibers that wick moisture, the Legend Mattress has a Eco Breathable cover made with organic cotton, wool, and recycled fibers, and the Oasis Chill mattress has an Ultra Cool cover with a cool-to-the-touch feel. Buy any of their mattresses in two twin XLs and put them on a king base to create a split king bed.

Customer Review | “I recently got a split king bed from Leesa – 2 twin XL mattresses and a base and it is so so comfy AND helping my husband and I both sleep better because he can elevate his head and it makes it less likely he snores! Marriage saver, for sure. Everything was easy peasy from ordering to assembling. So grateful for Leesa!” – Casey O. (Read more reviews.)

Featured image is from Avocado

Natalie Gale is a Boston-based freelance journalist. Since 2022, she has been reviewing the top sustainable home, wellness, fashion, and beauty products, sharing her honest opinion on the best finds. When she’s not writing about art, food, or sustainability, you can find her biking to the farmers’ market, baking, sewing, or planning her next Halloween costume. Say hi on Instagram!