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There’s nothing quite like a good night’s sleep, and a high-quality king size mattress can make all the difference. As one of the largest mattress size options available, king size mattresses provide ample space and comfort for individuals, couples, and even families who enjoy sharing the bed. With the wide range of options and materials available, finding the best king size mattress for your needs can significantly impact sleep quality and overall well-being.

When selecting the best king size mattress, there are a few critical factors to consider, such as material, firmness, price, and overall support. Mattress materials vary from traditional innerspring, memory foam, hybrid, and more. Each material provides its unique feel, level of support, and breathability, making it essential for individuals to find what works best for their preferences and sleeping positions. Understanding the different materials is crucial when looking for the most comfortable and supportive mattress.

In addition to materials, it’s essential to consider firmness levels and support when purchasing a king size mattress. A mattress that offers the right balance between comfort and support is vital to help alleviate pressure points, maintain proper spinal alignment, and prevent tossing and turning throughout the night. The ideal firmness level depends on sleep position, body type, and personal comfort preferences. As a rule, side sleepers often benefit from softer mattresses, while back and stomach sleepers find medium-firm to firm mattresses more supportive.

With so many options, finding the best king size mattress can be overwhelming. I’ve spent countless hours researching and comparing the top choices available, considering all the essential factors, to help you find the perfect mattress for that much-needed restful sleep.

A List Of The Best King Size Mattresses

How I Compared The Mattresses

To compare these mattresses effectively, I evaluated them based on several key criteria. First, I considered the materials used in the construction of each mattress, as this directly impacts factors like comfort, support, and temperature regulation. I paid close attention to the foam layers, coil systems, and any unique technologies or infusions used. Second, I assessed the overall comfort level and firmness of each mattress, taking into account the various sleep positions and how well the mattress caters to individual needs. Third, I examined the breathability and cooling features of each option, as many sleepers struggle with overheating during the night. Lastly, I looked at the overall value for the price, including factors such as warranty, trial period, and customer reviews.

By thoroughly researching and comparing these mattresses based on these key criteria, I was able to narrow down the list and ultimately identify the best king size mattress for most consumers. This comprehensive approach ensured that I considered all important aspects of each mattress, helping potential buyers make an informed decision when selecting their next sleep solution.

The Top Picks Compared

Product Thickness Firmness Material
Novilla 12 inch Gel Memory Foam 12 inches Medium Gel Memory Foam
Zinus 12 Inch Green Tea Memory Foam Mattress 12 inches Medium Green Tea Memory Foam
Signature Design by Ashley Chime 12 inches Medium-firm Memory Foam & Innerspring
Amazon Basics Memory Foam Mattress 12 inches Medium Memory Foam
Amazon Basics Hybrid 12 inches Medium-firm Hybrid (Memory Foam & Innerspring)
Molblly Mattress 12 inches Medium-firm Memory Foam
Vibe Gel Memory Foam Mattress 12 inches Medium Gel Memory Foam

The Best King Size Mattresses In Detail

In my quest for the perfect night’s sleep, I have researched and compiled this list of the best king size mattresses available on Amazon.

Novilla 12 inch Gel Memory Foam

Novilla 12 inch Gel Memory Foam

I highly recommend the Novilla King Size Mattress for a cool and pressure-relieving sleep experience.


  • Excellent breathability and temperature regulation
  • Comfortable and supportive for pain relief
  • Easy setup and fits all bed frames


  • May take some time for the mattress to regain its full shape
  • Could be too firm for some preferences
  • May need regular rotation for even wear

I recently tried out the Novilla King Size Mattress, and it exceeded my expectations. The gel-infused memory foam combined with the bamboo fabric cover made it highly breathable and kept me cool throughout the night. No more night sweats or overheating for me!

The four-layer all-foam system effectively distributed pressure and provided excellent support for my back and spine, minimizing morning aches and pains. The mattress also dampened my partner’s movements, so we both enjoyed a peaceful and undisturbed sleep.

Setting up the Novilla King Size Mattress was a breeze. It arrived in a compact box, and within 72 hours, it expanded to its full size. The best part? It fits all bed frames, so you don’t have to worry about compatibility. Try it out with the 100-day free trial and see for yourself!

Zinus 12 Inch Green Tea Memory Foam Mattress

Zinus 12 Inch Green Tea Memory Foam Mattress

I highly recommend the Zinus 12 Inch Green Tea Memory Foam Mattress for those seeking a plush, supportive, and refreshing sleeping experience.


  • Infused with green tea and charcoal for freshness
  • Pressure-relieving foams for achy joints and spinal alignment
  • Layered design with airflow-enhancing foam for temperature regulation


  • May be too plush for some personal preferences
  • Takes up to 72 hours to fully expand after unboxing
  • Heavier sleepers may need additional support

As someone who has used the Zinus 12 Inch Green Tea Memory Foam Mattress, I can attest to its incredible comfort and support. The mattress is infused with green tea and ActivCharocal, which not only keeps it fresh and odor-free, but also helps to prevent moisture buildup. The mattress is CertiPUR-US certified, ensuring its durability, performance, and content.

The pressure-relieving memory foam cradles my body and alleviates aches and pains in my joints, while also keeping my spine aligned. As a side sleeper, I have found this mattress to be perfectly suited for my needs, with just the right amount of plushness and support. The addition of airflow-enhancing comfort foam prevents overheating and adds extra comfort to areas that need it the most, such as the shoulders, hips, and knees.

The Zinus Green Tea Memory Foam Mattress comes with a 10-year worry-free warranty, giving me peace of mind that my investment is protected should any issues arise. The mattress is efficiently packaged for easy shipping and set-up, expanding to its original shape within 72 hours of unboxing. Despite its few minor drawbacks, I firmly believe that the Zinus Green Tea Memory Foam Mattress is a fantastic option for those seeking a supportive, refreshing, and comfortable night’s sleep.

Further Reading: Check the full Zinus mattress review

Signature Design by Ashley Chime

Signature Design by Ashley Chime

I highly recommend this mattress for those seeking a balance between comfort and support, with its memory foam and thick layer of firm support foam.


  • Contours to your body for superior comfort
  • Reduces motion transfer for undisturbed sleep
  • Easy setup with convenient boxed arrival


  • May take 72+ hours for full expansion
  • Potential for residual odors from packaging
  • Foundation and frame sold separately

From my experience, the Signature Design by Ashley Chime 12 Inch King Mattress has been a dream come true. Its memory foam layer adapts to my body shape, providing exceptional support and pressure relief. I’ve never slept better!

One feature that stands out to me is the thick layer of firm support foam, which reduces motion transfer. As someone who shares a bed, this has made a world of difference in ensuring a peaceful, undisturbed night’s sleep for both of us.

The mattress arrived conveniently packaged in a box, making the setup process a breeze. However, be prepared to wait up to 72 hours for the mattress to fully expand and for any residual odors from the packaging to dissipate. Overall, the Signature Design by Ashley Chime 12 Inch King Mattress has significantly improved my sleep quality, and I couldn’t be happier with this purchase.

Amazon Basics Memory Foam Mattress

Amazon Basics Memory Foam Mattress

If you’re looking for a comfortable and affordable king-size mattress, the Amazon Basics Memory Foam Mattress is definitely worth considering.


  • Well-balanced comfort and support
  • Adapts to various sleep positions
  • Certified safe materials used


  • May retain some heat
  • Takes up to 72 hours to fully expand
  • A bit on the firmer side for some people

I recently tried the Amazon Basics Memory Foam Mattress and found it quite enjoyable. The king-size mattress measures 80 x 76 x 8 inches, which provided ample space for me to stretch out and relax. The plush-feel memory foam layer is fantastic, as it adapts to the contours of my body, making my sleeping experience comfortable no matter what position I prefer.

One thing that particularly impressed me was the well-designed layers of foam, which facilitated circulating airflow, thanks to the breathable holes in the second layer and the wavy surface of the third layer. This helped to keep the mattress fresh and free from dampness, even in a slightly humid environment.

The Amazon Basics Memory Foam Mattress boasts CertiPUR-US Certified foam and an Oeko-Tex Certified top fabric. This made me feel confident about my purchase, knowing that I was using a high-quality product made from safe and durable materials. However, be prepared to wait up to 72 hours for the mattress to fully expand after unboxing, as it is vacuum-sealed for delivery.

Amazon Basics Hybrid

Amazon Basics Hybrid

I highly recommend the Amazon Basics Hybrid King Mattress for its ideal combination of comfort and support for a restful night’s sleep.


  • Body temperature regulation with gel-infused memory foam
  • Excellent full body support and pressure relief
  • Individually encased steel coils for edge-to-edge support and proper airflow


  • Requires 48 hours for the mattress to reach full expansion
  • Avoid using with an elevating base
  • Heavier item at 91 pounds

After trying out the Amazon Basics Hybrid King Mattress, I was impressed by the gel-infused memory foam top layer, which not only helped in regulating my body temperature through the night, but also conformed to my body’s shape, reducing pressure points and alleviating joint strain. This feature made my sleeping experience significantly more comfortable.

The individually encased steel coils of this mattress played a huge role in providing support and maintaining proper airflow. They also ensured edge-to-edge support, making it a perfect choice if you’re looking for a mattress that offers a good balance between firmness and softness.

Although the mattress arrives cylindrically wrapped and compressed, which makes it easy to move and set up, it is worth noting that it takes 48 hours for the mattress to fully expand once opened. Make sure to plan accordingly to have the mattress ready for use when needed. Also, to avoid deforming the foam layer, avoid using it with an elevating base.

Molblly Mattress

Molblly Mattress

After trying out the Molblly 12 Inches King Size Mattress, I believe it’s a great option for hot sleepers and those seeking back pain relief thanks to its cooling gel memory foam and medium firm support.


  • Effective cooling gel memory foam for a comfortable sleep
  • Minimal motion transfer for undisturbed rest
  • Medium-firm support suitable for all sleep positions


  • Dimensions may not exactly match standard king size
  • Requires 72 hours to fully expand after unboxing
  • Heavier than some other boxed mattresses

I was initially skeptical about trying a new mattress, but the Molblly 12 Inches King Size Mattress truly impressed me with its innovative cooling gel memory foam. As a hot sleeper, I found this feature to be a game changer. By maintaining a comfortable temperature, I was able to experience a satisfying and restful night’s sleep.

One of my concerns with mattresses is motion transfer, especially when sharing the bed with a partner. Thankfully, the Molblly Mattress minimizes this issue. Even when my partner tosses and turns throughout the night, I remain undisturbed and continue to sleep peacefully.

As someone who has tried various sleep positions, I value a mattress that provides ideal support in any situation. The Molblly Mattress’s medium-firm feel has been perfect for me, offering enough support for proper spinal alignment while still being gentle on sensitive areas. Overall, the Molblly 12 Inches King Size Mattress has genuinely improved my sleep experience, and I wholeheartedly recommend it to others seeking an upgrade.

Vibe Gel Memory Foam Mattress

Vibe Gel Memory Foam Mattress

I found the Vibe Gel Memory Foam 12-Inch King Mattress to be a comfortable and affordable option for those looking to upgrade their sleeping experience.


  • Easy setup with a quick decompression process
  • Gel foam provides cooling effect for comfortable sleep
  • Plush firmness to accommodate various sleep positions


  • May take up to 72 hours to fully expand
  • Heavier than some other mattress options
  • Made in the Philippines, which may concern some buyers

After unboxing the Vibe Gel Memory Foam 12-Inch King Mattress, I was pleasantly surprised by how easy it was to set up. I simply removed the mattress from the packaging and let it decompress. I even noticed that walking and sleeping on the mattress seemed to speed up the process.

The mattress itself is constructed with gel foam, which is fantastic for those who tend to sleep hot. I found that the cooling properties of the gel foam provided a more comfortable sleep than traditional memory foam mattresses. Additionally, the plush firmness of the mattress made it comfortable for me to sleep in various positions, including on my side and back.

One downside I noticed was that it took nearly 72 hours for the mattress to fully expand, so patience is key. Additionally, this mattress is on the heavier side, which may be a concern for some. Lastly, the mattress is made in the Philippines, and while this didn’t affect my experience, it may be important to note for some buyers.

King Size Mattress Buying Guide

A king size mattress is a luxurious upgrade, providing extra space and comfort for couples or individuals who enjoy having ample room to stretch out. While some factors in choosing a king size mattress overlap with selecting a queen size, there are key differences to consider. This specialized buying guide will help you navigate the world of king size mattresses and make an informed decision that leads to restful sleep for years to come.

Space considerations

As king size mattresses are significantly larger, measuring 76 inches wide by 80 inches long, it is crucial to verify that your bedroom can comfortably accommodate the larger dimensions, along with other furniture and sufficient walking space. Additionally, ensure that the mattress can be easily transported through doorways and hallways, and that your bed frame or foundation is compatible with king size dimensions.

Split King options

For couples with different sleep preferences, a split king mattress might be the ideal solution. This configuration consists of two twin XL mattresses, each measuring 38 inches wide by 80 inches long, placed side by side on a king size bed frame. This allows for individual customization of firmness, motion isolation, and adjustable bed base compatibility.

Customization for couples

King size mattresses provide ample space for couples, making it essential to consider the unique preferences of both sleepers. Focus on mattress types and materials that offer motion isolation, adjustable firmness, and a balance of comfort and support that suits both partners.

Extra support for larger sleepers

King size mattresses are often the preferred choice for larger individuals or couples. In such cases, it is crucial to choose a mattress that provides adequate support and durability. Look for materials with high-density foams, reinforced coil systems, and strong edge support to ensure the mattress withstands the test of time.

Investing in luxury and comfort

A king size mattress is often seen as a luxury upgrade. Consider investing in premium materials and features to maximize the comfort of your sleeping experience. Examples include high-quality memory foam or natural latex, pillow top or Euro top designs, and advanced cooling technologies.

Bedding and accessories

When upgrading to a king size mattress, remember that you will also need to invest in king size bedding and accessories, such as sheets, duvet covers, and pillows. Consider the additional costs and make sure to choose high-quality products that complement your new mattress.

Delivery and setup logistics

Due to the larger size and weight of king size mattresses, delivery and setup can be more challenging. Research the delivery options offered by the retailer, and consider white glove delivery, which includes in-home setup and old mattress removal, to simplify the process.

Cal King alternative

If you or your partner are taller, you may want to consider a California King mattress instead. It measures 72 inches wide by 84 inches long, providing an additional 4 inches of length compared to a standard king size mattress. Keep in mind that this option may require a separate search for compatible bed frames, foundations, and bedding.


In conclusion, after reviewing and comparing various mattresses, each offering unique features and benefits, I have found the Zinus 12 Inch Green Tea Memory Foam Mattress to be the best king-size mattress option. Its green tea infusion, pressure-relieving foams, and layered design for airflow make it an excellent choice for a wide range of sleepers. This king mattress provides a supportive, refreshing, and comfortable night’s sleep, standing out among its competitors.

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