Our in-house sleep experts tested over 120 beds, so our picks for the best king-sized mattresses are some of the best mattresses around—but designed for couples, big and tall sleepers, and sprawlers, alike. For this story, we made special considerations for features like cooling, motion isolation and edge support, embodied by two of our favorites: the Helix Midnight Luxe and the DreamCloud Hybrid. (Specifically, we’d recommend the softer Midnight Luxe for side sleepers or those seeking pressure relief, while the DreamCloud is a firmer choice for back and stomach sleepers.)

But there are more top-notch picks to consider, from memory foam and organic options to hybrids that offer softness and support. Ahead, we’ve rounded up the best king-sized mattresses for better sleep in 2025 for sleeping positions and preferences across the board. For more beds to browse, check out our guides to the best mattresses for couples and the best mattresses of 2025.

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The Best King-Size Mattresses Compared

Everyone’s sleep needs are unique. Some people prefer a softer bed, while others need a mattress with more support. And if you share a king-size mattress with a partner, you’ll need a bed that can accommodate both parties. To help you decide which mattress is ideal for you, we compared our top picks side by side.

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Why Trust Forbes Vetted

We spend a lot of time thinking about sleep here at Forbes Vetted. As a result, we’ve published a large collection of mattress and sleep guides including other size-related mattress stories like the best twin-size mattresses and queen beds.

• Mattress and sleep editors Bridget Chapman and McKenzie Dillon are certified sleep science coaches and professional mattress testers. Together they’ve reviewed over 120 mattresses, including all of the ones above, and oversee all of the recommendations in this guide.
• While Chapman and Dillon provided the majority of our king-size recommendations, we also asked our team members for their favorite king-size beds that they’ve tested.
• We spoke to Dr. Eva Lassey, Doctor of Physical Therapy and CEO of DrSensory, and Dr. William Kemp, neurosurgeon at Virginia Spine Institute, on what to consider when shopping for a king-size mattress.
• We frequently refresh this guide to reevaluate our recommendations, and to ensure our guidance is up to date. It was last updated by mattress updates writer Alexandra Garrett in March 2025. She answered further questions about the best king-size mattresses and added a chart of our top picks.

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How We Test The Best King-Size Mattresses

To put together this list of the best king-size mattresses, we combined our mattress testing expertise with hours of research. We identified bestsellers and compared our top choices across key factors, such as support and pressure relief, as well as features that matter most for people who share a king-size bed with a partner, including motion isolation, edge support and temperature regulation.

Pressure Relief

Pressure relief measures how well a mattress minimizes stress on sensitive pressure points, such as the shoulder, hips and back. During testing, we lie in each sleeping position (side, back and stomach) for at least two minutes and note where we feel a build up of pressure and where we feel relief. On many occasions, we also sleep in these positions overnight to see whether we experience different results.

Edge Support

Edge support refers to how well the sides of the mattress withstand pressure if you sit on the side to tie your shoes or lie near the edge. This tends to be more of a concern when you share a mattress with a partner or pet because you may wind up right on the edge whether you want to or not. To test for edge support, we sit and lie on the edge of the bed in the three main sleeping positions: side, back and stomach. We then document how supported we feel and whether we can feel the sides of the mattress sagging or faltering.

Motion Isolation

Some king-size mattresses are better built to help minimize movement than others. This feature is called motion isolation, and it’s important to keep in mind if you share a bed with a partner, especially if they regularly toss and turn or get up to use the bathroom at night. To test this feature, we get comfortable on one side of the bed, while another tester moves around on the other side. They toss and turn, change sleeping positions, jump around and get in and out of bed. We then document how much movement we felt.

We also test for motion isolation by placing a glass of water on one side of the mattress and performing various movements. We then record how much the glass and the water inside the glass moved.

All-foam mattresses tend to offer better motion isolation than hybrid models, but a hybrid mattress (like the DreamCloud) can still be a good choice if you aren’t a fan of the sink-in feeling of memory foam.

Temperature Regulation

King-size mattresses often have cooling features that help with temperature regulation, sucv h as cool-to-the-touch mattress covers, infused memory foam and breathable springs. We test these features by evaluating every layer of the mattress. We start at the top and check whether the mattress cover is cool-to-the-touch. If it is, we measure how long the cooling sensation lasts. We then sleep on the mattress overnight and note how warm (or cool) we feel in the morning. Because some people sleep warmer than others, we compare the results among our team of testers.

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What To Consider When Buying A King-Size Mattress

Mattresses are highly individual, so it’s important to consider your unique needs and preferences before buying one. Factors like the mattress’ construction, size and firmness also play key roles in how a bed feels. Below, we breakdown these features and how to find the right king-size mattress for you.

Mattress Type

King-size mattresses are made of different materials and constructions that impact how the bed feels. Some excel at pressure relief in targeted areas, while others provide ample support all around. Here are the most common mattress types you’ll come across while shopping.

• Memory foam mattresses offer suburb pressure relief and motion isolation, making this type a good choice for couples and people with back pain. However, some people don’t like the sink-in feeling of these beds.
• Innerspring beds are firm, bouncy and tend to sleep cooler than memory foam. They’re a good choice for some back and stomach sleepers, but tend to lack the plushness preferred by side sleepers.
• Hybrid mattresses blend together elements of innerspring and memory foam beds. They have a coil system on the bottom and comfort layers on top to produce a balanced, supportive yet soft feel.
• Latex foam beds excel at deep contouring for pressure points, while sleeping cooler than all-foam mattresses. Natural latex, like Talalay or Dunlop, is also more eco-friendly and hypoallergenic than manufactured foams.

Firmness

The best king-size mattresses are available in a variety of firmness levels, but the right feel for you ultimately depends on your sleep position and body weight. “The amount of firmness and support play an important role in a good night’s sleep. My recommendation is finding a firm mattress that provides good support for your legs, spine, and pelvis,” says Dr. William Kemp, neurosurgeon at Virginia Spine Institute. For example, a soft mattress tends to be best for side sleepers or lightweight sleepers, whereas a firm or medium-firm mattress is generally the better choice for back sleepers, stomach sleepers and people with back pain. And if you’re a heavyweight sleeper, consider a firm mattress for sturdy support.

Responsiveness

Responsiveness is a measure of a mattress’ bounce and how quickly it responds to pressure and movement. A responsive mattress is especially beneficial to combination sleepers who change positions, as well as sleepers with mobility concerns. In general, a hybrid mattress is more responsive than a memory foam mattress, making it easier to move around and change sleeping positions.

Sleeping Position And Body Type

Body size plays a huge role in how a mattress feels and how accommodating it is. King-size mattresses are beneficial for heavier or taller individuals, as they give more space to spread out and sleep comfortably. Both single people who are tall or heavy and couples who need more space are ideal candidates for a king bed.

When choosing a specific mattress, it’s also essential to consider your sleeping position, especially to prevent and reduce pain. “Accommodating your sleeping position is crucial for reducing back pain because it helps better distribute body weight and maintain proper spinal alignment,” says Dr. Eva Lassey, Doctor of Physical Therapy and CEO of DrSensory.

For example, someone who sleeps on their side may want a plusher mattress that contours their pressure points, while a stomach or back sleeper typically needs a firmer mattress for enhanced support and spinal alignment. However, it’s important to note that the same firmness level can feel different depending on body size. In general, the lighter you weigh, the firmer a mattress feels, and the heavier you weigh, the softer it feels.

Bedroom Space

King-size mattresses take up a lot of floor space. At a standard 76 x 80 inches, these beds require a bigger bedroom than a queen-, full- or twin-size mattress. Be sure to measure your bedroom before purchasing a mattress to ensure it can fit comfortably in your space. By contrast, a California king mattress is slightly narrower and longer than a standard king, at 72 x 84 inches.

Shipping And Transportation

King-size mattresses are big and heavy, so we advise planning how to get the bed set up inside your home before finalizing any purchases. Some brands—like Saatva and Tempur-Pedic—offer free white glove delivery, so it’s something to consider if you’d rather have someone else do the heavy lifting for you.

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Different Types Of King-Size Mattresses

King mattresses are available in several different sizes. Although they can each comfortably accommodate two adults plus small children and/or pets, the exact dimensions vary. Be sure to measure your bedroom before purchasing a king-size mattress to ensure it can fit comfortably in your space.

• King: A standard king-size mattress is 76 x 80 inches, which is 16 inches wider than a queen-size but the same length.
• Split King: A split king combines two twin XL mattresses that are each 38 x 80 inches to make a standard king. It’s beneficial for couples who have differing firmness levels or want an adjustable bed.
• California King: If your feet hang off a queen-size mattress, a standard king won’t help since it’s the same length. However, a California king measures 72 x 84 inches, making it four inches longer while also taking away four inches of width so it doesn’t seem too large.
• Texas King: A Texas king mattress measures 80 x 98 inches. It adds inches to both the width and length, making it ideal for tall people, heavyweight people or those with children and pets. However, it doesn’t come standard at most mattress companies.
• Alaskan King: At 108 x 108 inches, the biggest mattress is the Alaskan King. It’s big enough for co-sleeping families or people with several Mastiffs. However, this size is difficult to find readily available, and bedding options are limited.

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