Best California King-Size Memory Foam Mattresses


Our review process

We've already done all the grunt work researching California king-size memory foam mattresses. That way, you don't have to pour over confusing articles about selecting the perfect one for you. By reading this article, you'll have an excellent grasp on what types of mattresses are available on the market, so you can confidently buy a mattress that will ensure comfortable sleep for years to come.

If you want to guarantee that your don't strain your back while you sleep, the California king memory foam might be what you need. These mattresses provide pressure-point relief by supporting the most sensitive areas of the body. Constructed with various foam types, they offer the perfect amount of support. However, they can smell a bit like chemicals at first, so you'll have to air them out for at least 24 hours before adding sheets. Another downside is that they aren't waterproof, so you'll need to be careful and make sure that they don't come into contact with moisture.

With added length, these mattresses are suitable for tall adults. They are perfect for couples, providing extra space for two people to sleep comfortably. These mattresses measure 72" X 84" and are great for master bedrooms. However, they are large and heavy, making them hard to move and flip. Also, they are not ideal for spaces with limited room, making small areas look somewhat cluttered.

Best Overall Score
An image of Lull Medium Firm Memory Foam California King-Size 10-Inch Mattress

Need better support for both your upper and lower body while you sleep? Take a look at the Lull Medium Firm Memory Foam California King-Size Mattress. This Lull mattress features a memory foam construction, accommodating every possible sleeping position. Made to be highly breathable, it prevents premature wear that would otherwise be caused by moisture and heat. Available in a California king-size, it provides additional room from bottom to top. It has a 10-inch thickness, keeping your mattress functional for years. It includes three layers and features a medium firm comfort level, giving better balance to pressure areas that we stress. This Lull mattress has Visco memory foam and support foam layers. It has a 100 night sleep trial, which means that if it doesn't feel like the perfect mattress for you after that time, you can return it free of charge.

    Pros
    • Medium firm comfort level will support your joints and other vulnerable areas
    • Features a highly breathable design, promoting the movement of air, so you remain cool throughout the night
    • Comes vacuum packed, making it easy to carry into the room of your choice
    Cons
    • California king-size reduces the amount of horizontal sleeping space
    • Medium firm comfort level can put uncomfortable pressure on pressure points
    • 10-inch thickness provides less support than thicker mattresses
Runner Up
An image of Casper Sleep CA001-01-GRY-6 Memory Foam California King-Size 10-Inch Responsive Mattress

Are you searching for a mattress that will give you better support for both your upper and lower body? You might want to consider getting the Casper Sleep Memory Foam California King-Size Mattress. This Casper Sleep mattress is designed with a memory foam construction, letting you toss and turn and then re-contours to your body after you've settled. Available in a California king-size, it offers additional room from bottom to top. It features open cell memory foam, memory foam, transition foam, and support foam layers. Featuring a 10-inch thickness, it can sustain a lot of weight so it won't sink in easily. With four layers, this Casper Sleep mattress supplies you with stability, ultra comfort, flexibility, and ultimate softness.

    Pros
    • California king-size is longer for more leg room
    • Includes four layers, working together for the ultimate comfort and support
    • Built with responsive foam
    Cons
    • Comes in a California king-size, reducing the width of sleeping space
    • 10-inch thickness doesn't provide the best support
    • Features a memory foam construction, making it harder for some to get off of the bed
For Side Sleepers
An image of Comfort Memories F03-00016-CK0 Memory Foam California King-Size 10-Inch Mattress

For serious comfort and a restful night's sleep, consider the Comfort Memories Memory Foam California King-Size Mattress. This Comfort Memories mattress helps reduce tossing and turning at night, which improves the quality of your sleep. It features a memory foam construction, letting you toss and turn and then re-contours to your body after you've found a comfortable position. It has a rayon, polyester blend cover, providing a strong fabric and the utmost comfort. Available in a California king-size, this Comfort Memories mattress offers additional space from bottom to top. It features memory foam and support foam layers. Featuring a 10-inch thickness, this Comfort Memories mattress can sustain a lot of weight so it will stay in great condition for longer.

    Pros
    • Comes with a rayon, polyester blend cover, providing a durable material and the utmost comfort
    • Helps reduce tossing and turning at night, improving your quality of sleep
    • California king-size is four inches longer for increased leg room
    Cons
    • California king-size reduces the amount of horizontal sleeping space
    • 10-inch thickness doesn't provide the best support
    • Memory foam construction releases undesirable odors
Additional Picks
An image of Comfort Memories F03-00015-CK0 Soft Memory Foam California King-Size 8-Inch Mattress

Are you looking to better support your upper and lower body at night? You might want to consider buying the Comfort Memories Soft Memory Foam California King-Size Mattress. With a memory foam construction, this Comfort Memories mattress accommodates every possible sleeping position. Equipped with antimicrobial benefits, it impedes the growth of bacteria and other microbes. This Comfort Memories mattress eliminates motion transfer, so any kind of movement won't disturb your sleep.

This Comfort Memories mattress features a soft comfort level and has three layers, so you can experience a triple layer support system. It has an 8-inch thickness, so your mattress will not sag in the middle or collapse around the edges. Available in a California king-size, this Comfort Memories mattress provides extra room from top to bottom. It features memory foam and support foam layers.

    Pros
    • Soft mattress prevents pressure by balancing your body weight without having your back or joints sink
    • Antimicrobial benefits provide a healthier sleep area
    • Reduces motion transfer, making it ideal for restless sleepers
    Cons
    • California king-size reduces the amount of horizontal sleeping space
    • 8-inch thickness doesn't provide the best support
    • Memory foam construction releases unpleasant odors
An image of GranRest Medium Firm Memory Foam California King-Size 12-Inch Mattress

For a good night's rest and endless comfort, opt for a GranRest Medium Firm Memory Foam California King-Size Mattress. With a medium firm comfort level, this GranRest mattress demands bones to absorb the highest amount of pressure so there is less weight on muscles. It is available in a California king-size, reducing the amount of horizontal sleeping space. This GranRest mattress has a 12-inch thickness, so it won't sink, sag, or leave body impressions after a long period of time.

Designed with a memory foam construction, this GranRest mattress allows you to move around in your sleep and then re-contours to your body after you've settled. It has I-Gel foam, convoluted foam, and HD foam layers. Featuring three layers, this GranRest mattress creates a strong support system for your entire body. Made to be highly breathable, it promotes airflow to prevent mold and mildew from developing. This GranRest mattress contours to your body, improving its overall support and comfort.

    Pros
    • Medium firm mattress will support your joints and other sensitive areas
    • Contours to the natural curves of your body for remarkable pressure point relief
    • Features a highly breathable design, preventing material degradation that would otherwise be caused by heat and moisture
    Cons
    • California king-size reduces the amount of horizontal sleeping space
    • Medium firm mattress can put painful pressure on pressure points
    • 12-inch thickness can appear too large in some bed frames
An image of Comfort Dreams M-085351 Memory Foam California King-Size 8-Inch Mattress

Need better support for both your upper and lower body while you sleep? You might want to consider getting the Comfort Dreams Memory Foam California King-Size Mattress. Available in a California king-size, this Comfort Dreams mattress offers additional space from bottom to top. With resistance to dust mites, it makes it a good option for those who suffer from allergies. It features an 8-inch thickness, which will keeps its shape even with additional weight.

This Comfort Dreams mattress has a memory foam construction, which will accommodate every possible sleeping position. With antimicrobial benefits, it discourages the growth and development of bacteria. It eliminates motion transfer, so you won't be woken up by movement. Easy to transport, it adds even more convenience for when moving or rearranging the room. It is suitable to use for standard box springs, platform beds, and boxed mattresses.

    Pros
    • Features antimicrobial materials, preventing bacteria, mold, and dust mites from spreading
    • Eliminates motion transfer, making it ideal for light sleepers
    • Made with pressure point relief technology to improve comfort and alleviate pain
    Cons
    • California king-size reduces the width of sleeping space
    • 8-inch thickness provides less support than thicker mattresses
    • Memory foam construction releases VOCs
An image of Tulo Medium Firm Memory Foam California King-Size 10-Inch Mattress

The Tulo Medium Firm Memory Foam California King-Size Mattress is a great choice for anyone who gets overheated at night. This Tulo mattress minimizes motion transfer, making it perfect for restless sleepers. It features cooling technology, which will control the temperature of your bed. Featuring a memory foam construction, it allows you to move around in your sleep and then re-contours to your body after you've settled.

This Tulo mattress is available in a California king-size, reducing the width of sleeping space. It has four layers and a medium firm comfort level, giving stronger balance to pressure areas that we tend to strain. With a 10-inch thickness, it can sustain a lot of weight so it won't lose its shape over time. It has a knitted cover, keeping its shape for easy care. With a ventilated design, it will stay dry in order to prevent mildew and mold from forming.

    Pros
    • Medium firm mattress will support your joints and other sensitive areas
    • Cooling technology absorbs heat more effectively to prevent you from feeling uncomfortably hot while sleeping
    • Minimizes motion transfer, making it perfect for light sleepers
    Cons
    • Comes in a California king-size, reducing the width of sleeping space
    • Medium firm mattress can put painful pressure on pressure points
    • 10-inch thickness doesn't provide the most support
An image of Tulo Soft Memory Foam California King-Size 10-Inch Mattress

The Tulo Soft Memory Foam California King-Size Mattress is a great option for anyone who gets easily overheated at night. This Tulo mattress has a memory foam construction, which will accommodate every possible sleeping position. It reduces motion transfer, making it great for light sleepers. With cooling technology, it disperses heat away from your body and allows for efficient airflow.

This Tulo mattress has three layers and features a soft comfort level for superior support, especially for people who sleep on their side. It features a 10-inch thickness, which provides a lot of foundational support and helps keep it in great shape for longer. Available in a California king-size, it offers additional space from top to bottom. It has a knitted cover, which ensures breathability and easy care. With a ventilated design, this Tulo mattress will remain dry in order to prevent mildew and mold from growing.

    Pros
    • Soft mattress prevents pressure by balancing your body without having your back or joints sink
    • Cooling technology provides enhanced cooling comfort
    • Reduces motion transfer, making it an ideal choice for restless sleepers
    Cons
    • California king-size reduces the amount of horizontal sleeping space
    • 10-inch thickness provides less support than thicker mattresses
    • Memory foam construction possibly releases a strong odor
An image of Comfort Dreams M-1025145CM51 Memory Foam California King-Size 10-Inch Mattress

Are you searching to better support your upper and lower body at night? Checking out the Comfort Dreams Memory Foam California King-Size Mattress. This Comfort Dreams mattress features a specialized material that is resistant to dust mites, which makes it a suitable option for those suffering from allergies. It has a 10-inch thickness, adding greater durability and extending the lifespan of your mattress. Available in a California king-size, it provides extra space from top to bottom.

This Comfort Dreams mattress features a memory foam construction, which allows you to move around in your sleep and then re-contours to your body after you've settled. With antimicrobial fabric, it prevents the growth and survival of bacteria or mold in your mattress. It eliminates motion transfer, making it perfect for restless sleepers. It is suitable to use for slatted bed bases, platform beds, and boxed mattresses.

    Pros
    • Antimicrobial benefits assist people susceptible to allergies
    • Minimizes motion transfer, making it an ideal choice for restless sleepers
    • Made with pressure point relief technology for added spinal and joint support and comfort
    Cons
    • Comes in a California king-size, reducing the width of sleeping space
    • 10-inch thickness doesn't provide the most support
    • Memory foam construction possibly releases VOCs
An image of AC Pacific Charcogel 12 Memory Foam California King-Size 12-Inch Mattress

If you want to make sure that you don't put too much pressure on your spine while you're sleeping, the AC Pacific Memory Foam California King-Size Mattress could be an excellent option. This AC Pacific mattress is dust mite resistant, protecting you against the factors that can cause allergic reactions. With a 12-inch thickness, it provides a lot of support and can hold more weight than thinner mattresses. Available in a California king-size, it offers four extra inches in length, making it ideal for taller people.

Designed with a memory foam construction, this AC Pacific mattress accommodates every possible sleeping position. It features 3 lbs gel memory foam and 3 lb memory foam layers. It is designed with antimicrobial fibers, preventing mold, bacteria, and dust mites from nesting. This AC Pacific mattress minimizes motion transfer, making it perfect for light sleepers.

    Pros
    • Antimicrobial benefits ensure a cleaner sleep space
    • Minimizes motion transfer, making it ideal for light sleepers
    • Helps reduce tossing and turning at night, significantly improving your quality of sleep
    Cons
    • California king-size reduces the width of sleeping space
    • 12-inch thickness can tend to appear bulky in some bed frames
    • Memory foam construction releases undesirable odors
Still Need Some Help Narrowing Down Your Options? Here's Some Additional Information to Know:
Mattress Thickness: What to Know Before You Decide on Your California King-Size Memory Foam Mattress
6-8 Inch Mattresses

There are only two California king-size memory foam mattresses with a thickness of 6-8 inches. These 6-8 inch mattresses can be moved easily thanks to their compact build. They are suitable to use with standard-size sheets, so you can easily find linens and other bed accessories that fit. Perfect for trundle beds, they are convenient for sleepovers. However, they tend to wear out quickly, so you will have to replace them more frequently. Additionally, these 6-8 inch mattresses might get indentations if there's too much weight put on them, making them less than ideal for couples. If you think a 6-8 inch mattress is a good choice, check out this one.

8-10 Inch Mattresses

Looking for a California king-size memory foam mattress that's not too thin or thick? Check out an 8-10 inch mattress such as this awesome one. Less likely to cave in, these 8-10 inch mattresses will provide proper support while sleeping. They are suitable to use with standard-size sheets, so it will be easy to find linens that fit. Designed with a standard thickness, thick mattresses can fit in most bed frames. Something to keep in mind is that they provide less support than other mattresses, which can lead to painful and sleepless nights. Also, they tend to wear out quickly, so you will have to replace them more frequently. Hopefully your decision of how thick you want your California king-size memory foam mattress to be will be a bit easier now.

10-12 Inch Mattresses

There are only two California king-size memory foam mattresses with a thickness of 10-12 inches. These mattresses are built with a strong construction, making them more durable and able to sustain more weight. Less likely to cave in, they will provide adequate support while sleeping. These 10-12 inch mattresses are suitable to use with standard-size sheets, so it will be easy to find linens that fit. They are standard size, so you can rest assured knowing that they'll be able to fit in nearly all bed frames. Something to keep in mind is that they feature a heavier design, which makes them harder to flip over or move around when necessary. You can look at this California king-size memory foam mattress if a mattress with 10-12 inch thickness is what you're looking for.

Let's Talk About Mattress Comfort
Firm Mattresses

If you're considering a firm mattress, a California king-size memory foam mattress might be a good choice for you. These mattresses have a 34-36 pound indentation load deflection ranking and are suitable for individuals who find it more comfortable to sleep on their back. They allow for proper weight distribution, supporting your joints and other sensitive areas. Firm mattresses promote circulation and blood flow, aiding in deeper and more restful sleep. A potential downside is that they can put strain on specific pressure points, so if you want a mattress that relieves pain in pressure points, this is not the mattress for you. Another downside is that they can be uncomfortable if you're not used to sleeping on hard surfaces, so it'll take some time to get used to them.

Ultra Plush Mattresses

If you're trying to find an ultra plush mattress, a California king-size memory foam mattress might be a good choice for you. These mattresses have a 14-19 pound indentation load deflection ranking and are suitable for individuals who usually sleep on their sides. They offer contouring support, so they adjust to your body shape for superior comfort. With extra support, they are a preferable choice for making sure that any back problems or joint pain you have don't get worse. Something to keep in mind is that they usually become softer over time, so you'll have to replace them more often than other types of mattresses. Additionally, these mattresses may be problematic if different sleepers will be using the bed, causing the surface to sink if there is a significant difference in weight.

Medium Firm Mattresses

If you're trying to find a medium firm mattress, a California king-size memory foam mattress might be a good choice for you. These mattresses are good for couples where one individual who likes to sleep on their side and the other on their back or stomach. They are built with a 29-31 pound indentation load deflection ranking and are perfect for individuals who usually move from their back to sides when sleeping. They deliver proper weight distribution, supporting your joints as well as other sensitive areas. Something to keep in mind is that they are more likely to become a bit lumpy or sink in over time, so your body won't be adequately supported when sleeping.