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California King memory foam mattresses starting at $1149
Available in 5 models
California King memory foam mattress

California King Size Memory Foam Mattresses: Luxurious Length and Comfort

Experience the ultimate in spaciousness and support with our California King size memory foam mattresses. Designed for taller individuals and those who crave extra legroom.

Why Choose a California King Size Memory Foam Mattress?

Memory foam is known for its unrivaled pressure relief and a cloud-like feel. It conforms to your body's unique shape, cradling your curves and distributing weight evenly to minimize pressure points. Amerisleep's proprietary Bio-Pur® takes those qualities a step further by being more responsive and breathable than traditional memory foam. In a California King size, you get all the benefits of memory foam with extra length for a truly luxurious sleep experience, ideal for taller individuals or couples who want more legroom.

Our California King size memory foam mattresses are designed to provide:

  • Extra Length for Tall Sleepers: Enjoy ample legroom and avoid having your feet hang off the end of the bed.
  • Exceptional Pressure Relief: Soothe your joints and muscles with foam that adapts to your body.
  • Superior Spinal Alignment: Promote a healthy sleep posture and reduce back pain.
  • Minimal Motion Transfer: Enjoy undisturbed sleep, even with a restless partner.
  • Cooler Sleep: Our open-cell, plant-based Bio-Pur® foam helps you sleep cooler than traditional memory foam.
  • Ideal for Master Suites: The California King size makes a grand statement in a spacious bedroom.

If you're a taller individual, or simply someone who loves to stretch out and enjoy extra legroom, our California King size memory foam collection is the perfect solution.

Customer Testimonial: "I always thought memory foam was too hot until I found Amerisleep. Their foam is breathable and super supportive.” — Christina Serrano (@chrissymarieblog)

Browse our California King size memory foam mattresses starting at $1149.

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Firm Cal King Size Memory Foam
$1649
$1149 with promo
Save $500
  • Cal King: 72" x 84"
  • Firm feel
  • 2" of Bio-Pur®
  • 8" of Bio-Core®
Shop the AS1 - California King
Supportive Cal King Size Memory Foam
$1849
$1349 with promo
Save $500
  • Cal King: 72" x 84"
  • Medium-firm feel
  • 2" of Bio-Pur®
  • 3" of HIVE® for zoned support
  • 7" of Bio-Core®
  • Chiropractor Recommended: for spinal alignment and back pain relief.
Shop the AS2 - California King
$2049
$1549 with promo
Save $500
  • Cal King: 72" x 84"
  • Medium feel
  • 3" of Bio-Pur®
  • 2" of HIVE®
  • 7" of Bio-Core®
Shop the AS3 - California King
Plush Cal King Size Memory Foam
$2049
$1549 with promo
Save $500
  • Cal King: 72" x 84"
  • Plush feel
  • 4" of Bio-Pur®
  • 1" of HIVE®
  • 7" of Bio-Core®
Shop the AS4 - California King
Softest Cal King Size Memory Foam
$2649
$2149 with promo
Save $500
  • Cal King: 72" x 84"
  • Ultra-plush feel
  • 3" of Bio-Pur®
  • 2" of Active Flex
  • 2" of HIVE®
  • 7" of Bio-Core®
Shop the AS5 - California King
Adjustable Bed Base
$4049
$2829 with promo
Save $1220
  • Adjust angles effortlessly
  • Zero-gravity position
  • Pair our frame with the mattress of your choice
  • Made in USA
Shop the Adjustable Bed Package - Cali Split King
$4649
$3249 with promo
Save $1400
  • Head and foot articulation for achieving your ideal sleep position
  • Whisper‑quiet motors for smooth, silent adjustments
  • Wireless remote control (with mobile app and smart assistant integration)
  • Full‑body massage function with three intensity settings
  • Adjustable legs (in 3‑inch increments) for customized height
  • Backed by a 10‑year warranty and free shipping
  • Pair our frame with the mattress of your choice
Shop the Adjustable Bed+ Package - California King
$2839
$2204 with promo
Save $635
  • Award‑winning AS3 mattress featuring eco‑friendly, cooling Bio‑Pur® memory foam
  • Amerisleep Foundation that assembles in minutes with no tools and stands 13 inches tall
  • Flex Pillow with hundreds of MicroFlex cushions for a custom‑made feel
  • Bamboo Mattress Protector that guards against bacteria, dust mites, perspiration, and spills
Shop the Best Selling Bundle - California King

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  • Reviews - Average of 4.7 stars

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Why Amerisleep's Memory Foam is the Best Choice

Amerisleep mattresses are designed with spinal health in mind. The zoned support system helps maintain proper alignment, which is crucial for preventing back pain.
Dr. Jordan Burns, D.C.
As a sleep specialist, I recommend Amerisleep mattresses to my patients because of their superior comfort and support. The Bio-Pur® foam is breathable and doesn’t trap heat like traditional memory foam.
Dr. Colleen Ehrnstrom, MD
I’ve been impressed with Amerisleep’s commitment to using eco-friendly materials. Their Bio-Pur® foam is plant-based and has a lower environmental impact.
Dr. Miho Tanaka, MD
For patients with back pain, I often recommend memory foam mattresses that offer good spinal support. Amerisleep mattresses are a great option because they contour to the body and relieve pressure points.
Dr. Brian Nwannunu, MD
A good mattress is essential for quality sleep, and Amerisleep mattresses deliver on both comfort and support. I appreciate their focus on using high-quality materials.
Dr. Sasha Haddad, MD
As a physical therapist, I see firsthand the importance of proper sleep posture. Amerisleep mattresses help promote healthy spinal alignment, which can reduce pain and improve sleep quality.
Dr. Jennifer Miller, PT
The AS3 feels like sleeping on a cloud, but I’m never overheated. Perfect combo!
Christina Serrano
@chrissymarieblog
I always thought memory foam was too hot until I found Amerisleep. Their foam is breathable and super supportive.
Customer Testimonial
I’ve slept like a baby ever since I’ve been on this mattress.
Victor Saude
@mvft.fit
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Why Memory Foam? The Benefits Explained

Memory foam's greatest strength lies in its ability to conform to your unique shape, cradling your curves and distributing weight evenly, particularly around sensitive areas like your shoulders, hips, and back. This targeted pressure relief is a key reason why so many people find memory foam mattresses incredibly comfortable. In a California King size, you get all the benefits of memory foam with extra length for a truly luxurious sleep experience.

  • Pressure Relief: Memory foam’s greatest strength lies in its ability to conform to your unique shape. This adaptive quality cradles your body, easing tension and distributing weight evenly, particularly around sensitive areas like your shoulders, hips, and back. This targeted pressure relief is a key reason why so many people find memory foam mattresses incredibly comfortable.
  • Low Motion Transfer: If you share your bed with a partner, you’ll appreciate memory foam’s ability to isolate motion. Unlike traditional innerspring mattresses, memory foam absorbs movement, preventing it from rippling across the bed. This means you’re less likely to be disturbed when your partner tosses and turns, gets up in the night, or has a different sleep schedule.
  • Silent Support: Memory foam mattresses are virtually silent. The foam layers absorb sound and movement, eliminating the squeaks and creaks often associated with traditional spring mattresses. This makes for a more peaceful and undisturbed sleep environment.
  • Even Weight Distribution: By conforming to your body’s curves, memory foam distributes your weight evenly across the mattress surface. This eliminates pressure points and promotes healthy spinal alignment, which is crucial for reducing aches and pains.
  • Enhanced Durability: High-quality memory foam, like the Bio-Pur® used in Amerisleep mattresses, is designed to be more durable than traditional poly-foam. It resists sagging and indentations, ensuring consistent support and comfort for years to come.
What mattress is made of
Mattress pressure points

What Makes Our Memory Foam Different

  • Bio-Pur® Foam: Unlike traditional memory foam, which is often made with petroleum-based chemicals, our Bio-Pur® foam incorporates plant-based materials. This results in a more breathable, eco-friendly foam that sleeps cooler and has a more responsive feel, adapting to your movements without making you feel stuck.
  • HIVE® Technology: Our unique HIVE® technology, featured in the AS2, AS3, AS4, and AS5 models, provides a zoned support system. It offers firmer support where you need it most, such as under your lower back and hips, and a softer feel around your shoulders and legs. This targeted approach ensures optimal spinal alignment and pressure relief.
  • Bio-Core® Base: The foundation of our memory foam mattresses is the Bio-Core® base layer. This high-density foam provides a stable and durable support system, preventing premature sagging and ensuring the mattress maintains its shape and performance over time.
  • Active Flex (AS5): Exclusive to our AS5 model, Active Flex adds a layer of extra softness and responsiveness. This unique material enhances the plush feel of the AS5, providing exceptional pressure relief without sacrificing support.

Ready for a great night's sleep?

Shop California King Memory Foam Mattresses

Is a California King Size Memory Foam Mattress Right for You?

Our California King Size Memory Foam Collection is ideal for:

  • Taller Individuals

    Who need extra length to sleep comfortably without their feet hanging off the bed.

  • Couples

    Who want plenty of space, but prefer a longer mattress over a wider one.

  • Restless Sleepers

    Who toss and turn frequently. The generous length of a California King size allows for movement without disturbing a partner.

  • Side & Combo Sleepers

    Who benefit from the exceptional pressure relief and contouring of memory foam. The California King size offers ample space to change positions comfortably.

  • Back Pain Sufferers

    Those seeking a mattress that can properly align the spine and alleviate pressure points. Memory foam's supportive nature, combined with the California King size's extra length, is excellent for back pain relief.

  • Those with Joint Issues

    Individuals looking for a mattress that offers gentle, conforming support to ease joint pain. A California King size memory foam mattress provides a comfortable and supportive sleep surface with plenty of room to adjust positions.

A California King size memory foam mattress offers a unique combination of luxurious length, comfort, and support for a truly restorative sleep experience.

How Much Do California King Size Memory Foam Mattresses Cost?

Quality memory foam beds can range from $900–$2700+, depending on factors like:

  • Foam Density & Thickness: Thicker comfort layers and higher foam density often cost more but offer superior pressure relief and durability.
  • Cooling Features: Advanced cooling technologies like plant-based foam, open-cell designs, and special covers can add to the cost.
  • Zoned Support: Features like HIVE® technology, which provide targeted support, contribute to both cost and comfort.
  • Warranty & Durability: Longer warranties often indicate higher-grade materials and construction, which can influence the price.

Amerisleep California King size memory foam mattresses start at about $1149 with promotions—delivering top-tier comfort, eco-friendly construction, and robust warranties.

Mattress detail

California King Memory Foam Mattress Comparison Chart

Feature AS1 AS2 AS3 AS4 AS5
Firmness Firm Medium-Firm Medium Plush Ultra-Plush
Feel Solid, Sturdy Supportive with a touch of give Balanced comfort and support Soft, Cloud-Like Our Softest, Most Luxurious
Profile 10" 12" 12" 12" 14"
Ideal For Stomach Sleepers Back Sleepers, Heavier Individuals All Sleepers Side Sleepers Side Sleepers, Joint Pain
Support 8" Bio-Core® Base 7" Bio-Core® Base 7" Bio-Core® Base 7" Bio-Core® Base 7" Bio-Core® Base
Cooling Bio-Pur® foam Bio-Pur® foam Bio-Pur® foam Bio-Pur® foam Bio-Pur® foam
Motion Isolation Good Good Excellent Excellent Excellent
Edge Support Good Good Excellent Good Good
Price (California King) $1149 $1349 $1549 $1549 $2149
Shop Now Shop the AS1 Shop the AS2 Shop the AS3 Shop the AS4 Shop the AS5

AS3: Our Best-Selling Memory Foam Mattress

The AS3 strikes the perfect balance of comfort and support, making it our most popular memory foam mattress. Its medium feel suits a wide range of sleepers. With 3 inches of our Bio-Pur® foam and zoned HIVE® technology, you get:

  • Pressure relief that adapts as you change positions
  • Enhanced airflow for cooler sleep
  • Targeted support for optimal spinal alignment
  • Minimal motion transfer, even with a partner

"The AS3 feels like sleeping on a cloud, but I’m never overheated. Perfect combo!” — Christina Serrano (@chrissymarieblog)

California King size AS3 mattress shipping box

Choosing the Right Memory Foam Mattress

Watch as Dr. Jordan Burns, a practicing chiropractor, shares his expert tips on choosing a memory foam mattress for optimal comfort and support:

Key takeaways from Dr. Burns:

Additional tips

  • Consider your sleeping position: Side sleepers often prefer softer to medium mattresses (AS3, AS4, AS5), while back and stomach sleepers may need a firmer option (AS1, AS2).
  • Think about your weight: Heavier individuals may need a firmer mattress for adequate support, while lighter individuals may prefer a softer feel.
  • Look for cooling features: If you sleep hot, choose a memory foam mattress with open-cell construction, plant-based materials, or other cooling technologies.

Choosing the Right Size: Is a California King Mattress Right for You?

Our California King size mattresses offer an exceptional combination of length and comfort, measuring 72 inches wide by 84 inches long. They are the ideal choice for taller individuals who need extra legroom, and they also provide a luxurious and spacious sleep surface for couples. California King beds are typically best suited for larger master bedrooms. To determine if a California King size is right for you, consider your height, sleep preferences, and the size of your bedroom. For a detailed comparison of all mattress sizes, including dimensions and recommendations, visit our comprehensive Mattress Size and Dimensions Guide.

Frequently Asked Questions

Are memory foam mattresses hot to sleep on?

Traditional memory foam can trap heat, but Amerisleep’s Bio-Pur® foam is open-cell and more breathable, reducing heat retention.

How long do memory foam mattresses last?

High-quality foam like ours often lasts 8–10+ years, thanks to robust density and supportive base layers. We back our mattresses with a 20-year warranty.

Which memory foam firmness is right for me?

It depends on your sleep position. Side sleepers often like medium to plush (AS3, AS4, AS5). Back sleepers may prefer medium-firm (AS2). Stomach sleepers might opt for AS1. Take our mattress quiz to find your perfect match!

Do memory foam mattresses smell (off-gassing)?

Our foams are low VOC and CertiPUR-US® certified. Any “new mattress smell” typically dissipates within days, if at all.

Can I use a regular box spring with a memory foam mattress?

A solid foundation or slatted base is usually recommended. A worn or old box spring might cause sagging. Learn more about whether a bad box spring can ruin a mattress.

How does memory foam help with back pain?

It cradles the spine, relieving pressure in the lumbar area, promoting better alignment—especially with zoned support (HIVE®).

Do I need a mattress protector?

While not mandatory, a protector helps keep the mattress clean and prolongs its lifespan.

Are your memory foam mattresses adjustable-base friendly?

Yes. All our foam models bend easily with adjustable bases—no damage, no compromise on support.

What should I do with my old mattress?

Many charities accept mattress donations. You can also check with your local waste management company for recycling options. We also offer old mattress removal services in select locations. Learn more about mattress donation options.

Do you have any showrooms where I can try out the mattresses?

Yes, we have a showroom located in Scottsdale, Arizona at the Optima Camelview. We encourage you to visit us and experience the comfort of our mattresses in person. Our knowledgeable sleep experts can answer any questions you have and help you find the perfect mattress for your needs.

What size sheets do I need for a California King mattress?

You will need California King size sheets for a California King mattress. California King sheets typically measure 72 inches wide by 84 inches long.

How much does a California King size memory foam mattress weigh?

The weight of a California King size memory foam mattress can vary depending on the specific model and materials used. On average, a California King size memory foam mattress from Amerisleep weighs between 90 and 140 pounds.

What is the difference between a King and a California King?

A standard King size mattress is wider than a California King, while a California King is longer. A King measures 76 inches wide by 80 inches long, and a California King measures 72 inches wide by 84 inches long. See our Mattress Size and Dimensions Guide for more details.

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Experience Luxurious Comfort on a California King Size Memory Foam Mattress

Indulge in the ultimate sleep experience with our California King Size Memory Foam Collection. Enjoy exceptional comfort, support, and extra legroom for a truly restful night's sleep. Discover the difference of plant-based Bio-Pur® foam and elevate your sleep to new heights.

Shop California King Memory Foam Collection

This page was written by Rosie Osmun, a Certified Sleep Science Coach (CSSC) with over 15 years of experience in the health and sleep industries. Rosie's work has been featured in publications such as Healthline, Byrdie, Lifehacker, Men's Journal, Eating Well, Medical Daily, and BedTimes Magazine. She is passionate about helping people improve their sleep through informed mattress choices. This page was reviewed by the Amerisleep Product Development Team, which possesses over 20 years of combined experience in mattress design and sleep technology.

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