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A 12-inch king mattress gives you that extra depth of comfort and support that thinner beds just can’t match. It’s thick enough to deeply cushion your pressure points while still holding firm where it counts, making it perfect for all sleeping positions, and especially great if you’re on the heavier side. Turmerry’s 12-inch king mattresses are crafted with premium organic latex foam that’s breathable, durable, and naturally responsive, so you stay well-rested night after night. And if you’re wondering whether they're the right fit, try them with our 120-day risk-free trial.
Turmerry’s 12-inch king mattresses have what you need for solid sleep, year after year. They give you support that responds, pressure relief that adapts, and breathable cooling that lasts. We make them with organic Dunlop latex from Sri Lanka, so they stay comfortable and keep motion transfer low. You can use them in the main bedroom or the guest room—they work well either way. And with certifications like GOLS, OEKO-TEX, eco-INSTITUT, FSC, and LGA, you know they're built to last!
The 12-inch King Organic Latex Mattress features multiple Dunlop latex foam layers and a 7-zone support design, perfecting the all-foam mattress concept. Each zone caters to different body regions, providing targeted lumbar support and pressure point relief. The perforated organic latex foam allows for unrestricted airflow, ensuring a cooler night's sleep. It is padded with a flame-retardant, moisture-wicking barrier made of natural New Zealand wool and finished with a soft, breathable, zippered organic cotton cover that keeps out contaminants.
The 12-inch King Egg Crate Mattress boasts an all-foam construction with a substantial 2.4-inch egg crate foam as its top layer. This uniquely designed foam, resembling an egg carton, ensures exceptional contouring, pressure relief, and bed sore relief by evenly distributing body weight. Whether you're a side, back, or stomach sleeper, our Egg Crate Mattress has you covered with outstanding cushioning not found in regular mattress surfaces.
The 12-inch King DIY Hybrid Mattress is a match made in heaven for DIY enthusiasts. It features an 8-inch Texas Pocket Spring QuadCoil® support core and a 2-inch Dunlop latex foam comfort layer with a 7-zone design. The zippered cotton cover allows for easy customization, so you can adjust the mattress to create your perfect sleep surface.
The 12-inch Queen Bigg+ Mattress is built for heavier sleepers over 230 lbs., combining three extra-firm Dunlop latex layers with a customizable medium, firm, or extra-firm top layer. It can support up to a total weight of 1,100 lbs. Natural New Zealand wool adds fire resistance and temperature control, while the soft, zippered organic cotton cover keeps things breathable and comfortable. Certified by GOLS, OEKO-TEX, eco-INSTITUT, FSC, and LGA, it offers firm 7-zone support, pressure relief, cooling, and long-lasting durability—all without compromise.
Most mattresses are just okay. They do the job, but not much more. Turmerry’s 12-inch king mattress gives you real comfort and support. It helps your body relax so you can actually rest. You don’t just sleep - you recover. And when you wake up, you feel it. You’re clear-headed, less sore, and ready to go. Sleep well. Feel well. Get your Turmerry mattress today.
This guide explains 12-inch king mattresses in simple terms. You’ll learn the pros and cons, when they make sense, what features to look for, and the types and sizes available. It’s everything you need to choose the right one for you.
Before you go all-in on a 12-inch king mattress, it’s worth slowing down and thinking through a few key details. Here’s what to keep in mind:
A 12-inch king mattress can be a great choice if it fits your sleep habits, body weight, bed frame, and bedroom. If you're still a bit unsure of whether it'll work for you, we recommend trying it out at a nearby store.
Latex, memory foam, hybrid, and innerspring are the most popular types of 12-inch king mattresses you'll find on the mattress market today:
Made with latex foam, straight from rubber trees. Naturally tough, holds its shape, keeps things cool, and doesn’t sink like memory foam. Firmer feel overall, but still gives where it should. Lasts 10-20 years easy, with barely any sag. If you want something solid, breathable, and actually eco-friendly, latex is it.
Made with memory foam—a dense, slow-responding material made from polyurethane. It hugs your body for solid pressure relief, but can run warm if there’s no cooling built in. Best for sleepers who like that sinking, contouring feel. Just don’t expect the same support or bounce you’d get from latex or a hybrid.
Hybrid mattresses mix foam on top (latex, memory foam, or gel) with pocketed coils underneath. You get a nice balance: some cushioning, solid support, and better airflow than all-foam beds. They’re quieter and absorb motion better than old-school springs, but still feel responsive when you move.
Innerspring mattresses are the classic kind - built with coils like Bonnell, offset, or continuous for support, and a thin comfort layer on top. They’ve got that firm, springy feel and good airflow, but not much in the way of pressure relief or motion control compared to all-foam and hybrid beds.
In the US, you can find six standard mattress sizes, ranging from twin, which is the smallest, to king, which is the biggest.
A 12-inch twin mattress measures 38" x 75". It’s compact and space-saving, making it great for kids, bunk beds, and smaller rooms where every inch counts.
A 12-inch twin XL mattress measures 38" x 80". Perfect for taller sleepers and college dorms, it gives you extra legroom without taking up much more space.
A 12-inch full mattress measures 54" x 75". It’s a solid step up from a twin. Ideal for solo adults, teenagers, and guest rooms that need a little more room to stretch.
A 12-inch queen mattress measures 60" x 80". The most popular size, offering enough space for couples and anyone who likes to sprawl a bit.
A 12-inch king mattress measures 76" x 80". It’s big, bold, and built for couples/families. Pretty much the maximum in sleeping real estate.
A 12-inch California king mattress measures 72" x 84". Slightly narrower but longer than a standard king. Ideal for tall sleepers who want stretch-out space from head to toe.
Yes, 12 inches is thick enough for a king mattress. A 12-inch king mattress offers deep cushioning and excellent contouring for pressure relief. It’s built to provide strong support while still feeling plush enough to cradle your body comfortably. This thickness works well for anyone who wants that “sink-in-but-not-too-much” kind of feel.
Definitely. A 12-inch king mattress is more than capable of supporting adults comfortably. Its thicker profile means better pressure relief and sturdier support, which is especially important for the adult body. Whether you sleep on your back, side, or stomach, a 12-inch king mattress can handle it, giving you enough depth to stay comfortable throughout the night.
The easiest fix for an uncomfortable 12-inch king mattress is a king mattress topper. A high-quality latex mattress topper can add extra softness while still keeping the mattress under it intact. A supportive bed frame and an extra layer of good bedding can also improve overall comfort.
For the most part, yes. A 12-inch king mattress fits on most standard bed frames, including platform beds, slatted bases, and box springs. Just make sure your frame can support the mattress’s weight and thickness. If the frame has closely spaced slats or a solid foundation, you’re good to go. However, very low-profile frames or some adjustable bases might feel a bit tight. They may even raise your bed height more than expected, so it’s worth checking measurements before buying.
Two inches is all that separates a 12-inch king mattress from a 10-inch one. But those two inches actually make a solid difference. You get more cushioning, better pressure relief, and it feels softer overall. A 12-inch king mattress usually lasts longer, too, and holds up better if you weigh more. The 10-inch hits a nice middle ground—comfortable but slightly firmer. If you want something a bit plusher and built to last, the 12-inch is where it’s at.
A good 12-inch king mattress lasts around 7 to 10 years. Latex mattresses tend to go even further, often lasting 15 to 20 years. How long a mattress holds up depends on factors like the materials used, the weight it supports daily, how often you sleep on it, and how well you maintain it. Rotating your mattress regularly and using a mattress protector can extend its life, too.
Yes, it often is. A 12-inch king mattress offers enough cushioning to relieve pressure on shoulders and hips, which is key for side sleepers. The extra thickness also helps keep the spine aligned. If you like a bit more plushness without losing support, a 12-inch king mattress can be the best mattress for side sleepers.
Yes, a 12-inch king mattress can comfortably fit more than two people - like a couple plus a child, or even a pet or two. Measuring 76 inches wide by 80 inches long, it's the widest standard mattress size, offering plenty of surface area for shared sleeping. The 12-inch thickness also helps by providing deeper support and better pressure relief, so the mattress won’t bottom out under combined weight.
That said, how comfortable it feels depends on everyone's size and sleep habits. For families who occasionally share the bed, a standard king-size mattress is often the go-to. But for couples who want slightly more legroom than 80 inches, or need their side of the bed personalized to their taste, a California king mattress (72" x 84") or a split king mattress (38" x 80" each side) becomes the better choice.
Not necessarily. Thickness doesn’t automatically mean firmness. A 12-inch king mattress can be soft, medium, firm, or extra-firm depending on the materials and layers inside. So, if you’re worried about it feeling too hard, check the mattress’s firmness rating or try it out. There are plenty of options out there with varying levels of firmness.
It can. A good 12-inch king mattress offers enough support and cushioning to keep your spine aligned and ease pressure points, which are key for relieving back pain. But the real deal is how it’s made. Look for quality materials like latex and memory foam that contour to your body without sagging. If it’s too soft or too firm, it might not do the trick, so getting the right balance also matters when seeking the best mattress for back pain.
