The Casper California King Mattress

At 72” wide and 84” long, the Casper California King Mattress is the largest size offered. It’s ideal for couples, parents who share the bed with small children, and taller individuals who require extra leg room. Given its dimensions, it fits best in spacious master bedroom. Like all Casper mattresses, it will provide contouring support and keep you cool through the night.
$1,150

100 night trial, Free Return Pickup

Sleep on it, lounge on it, dream on it — if you don’t love our california king mattress, we’ll pick it up and give you a full refund. No springs attached.

THE PERFECT MATTRESS FOR EVERYONE

The Casper’s sleep surface is universally comfortable — it contours to your body to relieve pressure while retaining a healthy bounce and cool temperature. Sure there are lots of options out there, but we’ve cut through the confusion to offer a single, perfect choice.
SEE THE DESIGN STORY

COUNTRY OF ORIGIN

Designed and assembled in the USA.

CONSTRUCTION & MATERIALS

  • 4-Layer Foam Construction
  • High Elasticity Comfort Foam
  • Visco Elastic Memory Foam
  • Proprietary Transition Foam
  • Polyurethane Support Foam
  • Polyester/Polypropylene Zipper Cover

MEASUREMENTS & DIMENSIONS

Size Guide
  • Twin
    39” x 75” x 10”
    55 lbs
  • Twin XL
    39” x 80” x 10”
    57 lbs
  • Full
    54” x 75” x 10”
    72 lbs
  • Queen
    60” x 80” x 10”
    83 lbs
  • King
    76” x 80” x 10”
    103 lbs
  • CAL King
    72” x 84” x 10”
    104 lbs

SHIPPING INFO

In the US, we ship via UPS Ground. In Canada, we ship Purolator Ground from our Canadian warehouse partners. Please allow one extra day for customs. In parts of New York City, Los Angeles, and San Francisco, we offer same-day White Glove delivery. All mattresses come shipped in a 19” X 19” X 42” box.

SHIPPING COSTS

Free shipping and free returns in the US and Canada.

CERTIFICATION

All the foams in the Casper mattress have environmental certifications that ensure they are safe and non-toxic. All of our foams are CertiPUR certified.

CertiPUR-US® approved foams are made without ozone depleters, PBDE flame retardants, mercury, lead and other heavy metals, formaldehyde, phthalates regulated by the Consumer Product Safety Commission. They are Low VOC (Volatile Organic Compound) emissions for indoor air quality (less than 0.5 parts per million).

WARRANTY

10-year limited warranty. Read More

JUST THE RIGHT SINK,
JUST THE RIGHT BOUNCE

Engineered for everything you might do in bed, the Casper’s award-winning sleep surface combines supportive memory foam and a springy comfort layer. It offers just the right amount of sink and bounce for deep sleep and indoor sports.

KEEPS YOU COOL

Our top comfort layer features a breathable, open-cell design to increase circulation and keep you cool. Air can pass freely beneath your body, even when the material contours to your curves.

DESIGNED TO REST ON ANY FIRM, FLAT SURFACE

(ESPECIALLY THE CASPER FOUNDATION)

CASPER CALIFORNIA KING MATTRESS REVIEWS

4.4/5
Cant wait to get in bed
Sonya Komarinski
Verified Casper Owner
York, South Carolina
46 years old
Mar 21, 2017
Cant wait to get in bed

We ordered the king size mattress, box spring and frame. Absolutely love it. My favorite part is that I don't feel my boyfriend moving around all night.

7
hours of sleep per night
Sleeps with a partner
So much better than my previous mattress
Linda Hoffman
Verified Casper Owner
Philadelphia, Pennsylvania
67 years old
Mar 17, 2017
So much better than my previous mattress

I would definitely recommended Casper. The king size was heavier than I realized and was a bit of a problem for us to get upstairs. Once set up, however, I was happy with the choice. Motion transfer is not non-existent, but is greatly improved from my previous mattress. We have it on box springs, so I will try a bunkie board to see if that helps. The firmness is perfect for sleeping. And the temperature is good also. The only thing I don't like is sitting on the edge, too soft.

7
hours of sleep per night
Sleeps with a partner plus a cat
Best mattress ever
Shelly solhtalab
Verified Casper Owner
Holland, Ohio
57 years old
Mar 15, 2017
Best mattress ever

When we bought a mattress at Denver mattress we paid over 1000 dollars, about 4 years ago. After we bought our first Casper one year ago, we had to give away the most horrible expensive double pillow top. Now, we bought our 2nd king sized Casper for our guests as well ❤❤❤❤️❤ Thank you so much

8
hours of sleep per night
Sleeps solo plus a dog
Life changing mattress
lindsey s
Verified Casper Owner
Reno, Nevada
28 years old
Mar 14, 2017
Life changing mattress

So I got this king size mattress after a bad break up. I have never had my own bed as a single adult. This huge bed has made my very few hours of sleep a night so enjoyable. No aches and pains from a spring mattress and oh so much room! ☺ I love this mattress because it's mine and cradles me into the best sleep ever! I love my Casper mattress!

5
hours of sleep per night
Sleeps solo
Wonderful mattress
Brian & Denise
Verified Casper Owner
Manhattan, Kansas
59 years old
Mar 13, 2017
Wonderful mattress

We live in an old 2-story house with a very steep narrow stairway and wanted a king bed in our upstairs bedroom. We knew a regular king would not fit up the stairway and it wouldn't be able to go through any of the windows from outside, so we saw an ad for the Casper Mattress. We call it a "bed in a box". What a wonderful idea and concept. We had our hesitations because we were currently sleeping on a queen tempurpedic and really liked it. We opted to try the King Casper and after getting the vacuum packed package upstairs and opening it up, we were so amazed and impressed with the quality of the mattress. It sleeps like our tempurpedic and we absolutely LOVE it. We have much more room and couldn't be happier. Thank you.

6
hours of sleep per night
Sleeps with a partner plus a cat
Everything They Said And More
Terry Phipps
Verified Casper Owner
Victoria, Bc, Canada
62 years old
Mar 07, 2017
Everything They Said And More

I wasn't home when the king mattress arrived, but my husband opened the box and set it up himself. Our mattress arrived 2 days after we placed the order. I'm a side and stomach sleeper and my husband is a side and back sleeper. Every mattress I have tried before my Casper ended up causing me shoulder pain when I slept on my side. Even the high-end pillow top mattresses we paid well over $1000 for. My sleep would be interrupted by the constant turning from one side to the other to relieve the pressure pain. Well, no more! We've had our Casper mattress for a month now and I have NEVER experienced a more comfortable mattress. I sleep so well now. I really researched mattresses before we bought our Casper. The reviews I read were all positive and we liked the guarantee that was offered by the company. We could use the mattress for up to 100 days and return if not satisfied. Well, we're satisfied. 100%

8
hours of sleep per night
Sleeps with a partner
What a great mattress!!
Paul DeNigris
Verified Casper Owner
New Jersey
Mar 07, 2017
What a great mattress!!

We bought a king size mattress a couple of weeks ago and absolutely LOVE IT. It is so comfortable and I would recommend giving it a try!! You will not be disappointed!!

7
hours of sleep per night
Sleeps with a partner
An average mattress
Calvin
Verified Casper Owner
New York, New York
29 years old
Mar 06, 2017
An average mattress

I decided to give Casper a try after moving and needing a new mattress. The ordering was easy and was delivered in an air sealed packaging. Once it was opened the mattress quickly expanded to its full size. It was a bit soft during the first use, soft enough that I woke up with an aching back the first few nights if you're not accustom to a soft mattress, but firms up in time. After a few month of use, I wouldn't describe the comfort as being outrageous or exceptional compared to other mattress. For the price, it's a good mattress. If you're sharing this, you definitely want to get the king size as the side of the mattress is a bit too soft. You pretty much just sink in along the side especially if you sit on it. It's not a mattress that I would go raving about but I would offer it as an option.

7
hours of sleep per night
Sleeps solo
A great night's sleep at a fantastic price.
Tyler
Verified Casper Owner
Niagara Falls, On
34 years old
Mar 03, 2017
A great night's sleep at a fantastic price.

Replaced a ~10 year old pillow-top queen mattress with a king sized Casper and haven't looked back. Shipping was extremely quick and and the live chat was very helpful. The unboxing was fun, we enjoyed watching the mattress come to life and "expand" to its full size. Some similar style mattresses suggest a waiting period of 24-48 hours before you can sleep on them, but not with Casper, we went from unboxed to sleeping in 10 minutes. The mattress is extremely comfortable and sleeps myself, my wife, our English bulldog Leeroy, and a cat and it still doesn't feel crowded. I was worried that the mattress would sleep "hot" but it felt cooler then our previous mattress. Very pleased with the purchase and we will purchase another when it is time for our toddler to get a larger bed.

6
hours of sleep per night
Sleeps with a partner plus a dog
LOVE
Brigid McCormixk
Verified Casper Owner
Hinsdale, Illinois
66 years old
Feb 27, 2017
LOVE

We own two, one in Chicago and one in Maui. We had a regular mattress in Maui, but when we arrived here, we decided that we couldn't live without our Casper. Unboxing it is a cinch. What we love about it is how completely flat it is, yet, soft and comfortable. It gives you complete support all night. It does not move when my husband gets in or out of our bed. We couldn't imagine owning any other kind of bed now. I bought the linens, the white/chambray and the navy blue. Sheets/comforter covers, I bought 2 king size pillows for each bed, they are as wonderful as the mattress. I bought the mattress protector for our Maui bed because we rent when we are not here. The sheets fit perfectly, they are well thought out with the C at the bottom of the sheet to let you know where to place it. Keep washing them and they get more wonderful in time.

9
hours of sleep per night
Sleeps with a partner
Awesome!
Ellen King
Verified Casper Owner
Dripping Springs, Texas
65 years old
Feb 24, 2017
Awesome!

I am so impressed with my Casper mattress that I plan to purchase a king when I have the space. I share the bed with 7 small dogs and 2 cats, so it is a little crowded! The bed is so comfortable that my house sitter's wife ( a massage therapist) trades sitting assignments if she needs to get a really good night's sleep and rest her body after a full day of treatments. I really wish that Casper would make a mattress that would fit RV queen and king beds. The mattresses would certainly help with over tired bodies after driving for 8 to 12 hours. Perhaps the design team could look into that possibility for the future. Thank you Casper!

7
hours of sleep per night
Sleeps solo plus a dog
Miracle Mattress!
Cynthia & Randy Roubique
Verified Casper Owner
Warrenton, Missouri
53 years old
Feb 22, 2017
Miracle Mattress!

When my king sized Casper mattress came to the house in a BOX; I didn't think it was going to be a REAL mattress. Unboxing it was so funny and shocking, we both laughed til we cried. It exploded right out! Husband has been through 30+ years of back pain and multiple surgeries to find relief; to no avail. Many beds later, we found Casper. Randy sleeps, doesn't get hot ( I actually stay very cool) and upon waking, he doesn't hurt hardly at all. That is a real MIRACLE!! There is no comparison to conventional mattresses. Well over a year now and we don't even have a divot in the mattress! I bought the foundation and the metal bed frame when it became available and am as pleased with it as the bed itself. Casper's "Snooze" specialists are in a group all their own. When I had to call for help, they actually answered the phone and were able to help me solve the issue the 1st time. They are helpful, kind, and very respectful. I wish all customer service people were as great as these folks are! You would be doing yourself a disservice by not at least trying a Casper out for yourself. Thank you all at Casper!

5
hours of sleep per night
Sleeps with a partner plus a dog
From waterbeds to tempur-pedic, Casper beats them all!
Heather McCubbin
Verified Casper Owner
Middletown, Maryland
Feb 20, 2017
From waterbeds to tempur-pedic, Casper beats them all!

The mattress, boxspring (I used the term loosely as there are no springs) and frame were shipped right to our door, not all at the same time. Once everything was here, my husband easily assembled everything within 30 minutes, unrolled the mattress and minutes later we had sheets on it! No smell, easy to move around, regular king bed sheets fit (no deep pocket needed). From the first night, I noticed a huge difference. The main one being I didn't sweat. It really does help you stay cooler at night. My husband said he noticed it took a bit longer for his body heat to warm his side, but we were never cold. The bed feels firm at first but minutes later it fits you like a glove. I am 5'8" and I fit perfectly on it (no feet hanging off). The cat also enjoys the bed and being that this frame and "boxspring" are a just a few inches lower than our old one, it's easy for him to jump up and down. When it comes time to replace my children's beds and our guest bed, I will be getting another Casper. We chose this over Purple based upon Consumer Reports reviews, this was a bit cheaper and said it was better for side and back sleepers, which we are, and for taller people...like me!

8
hours of sleep per night
Sleeps with a partner plus a cat
Softer than I prefer
Spencer
Verified Casper Owner
Rensselaer, New York
49 years old
Feb 18, 2017
Softer than I prefer

I've been sleeping on my Casper for about a month. I'm 6' 3" and 195 lbs. I went from a queen to king size bed, which necessitated a new mattress. I can now say that I prefer my queen coil spring mattress to this foam one. The mattress is too soft for me. When I lie on my back, my rear goes deeper into the mattress. I wake up in the morning with a sore lower back. I didn't have this problem with my queen mattress. I will most likely be returning the Casper after a few more nights.

8
hours of sleep per night
Sleeps with a partner
Really great mattress at a reasonable price!
Sarah Long
Verified Casper Owner
Onalaska, Wisconsin
32 years old
Feb 16, 2017
Really great mattress at a reasonable price!

This Casper bed is one million times better than the last bed we had. Granted, the last bed was well over 10 years old, but still. We moved up from a queen to a king size bed, which is also amazing. My husband and I never feel the other one move around on their side of the bed, which makes for a much better sleeping experience for each of us. The unboxing was pretty fun, and I have to say we were shocked that our king size mattress could come in such a small box! We ordered a king size mattress and the foundation - we also have a metal king size frame that we set the foundation on to raise it up to "normal" height. Overall, everything was super easy. However, our foundation had a problem with the brackets not matching up on 3 of the 4 sides. This made for a fairly stressful situation, as we discovered this about 10 minutes before their offices closed on a Friday night and had already moved our other bed out of the room. However, a few quick phone calls to HQ and we had it worked out. My husband ended up moving 3 of the brackets about 1/4" each to allow them to line up, and then the foundation went together really easily. This was done in about 5 minutes with a drill. Very nicely, Casper sent us two pillows to make up for that experience, which was awesome. We love the pillows, too, although I think I would have a hard time paying full price for them - it's just not something I'm used to doing! Overall, we are very happy with our experience and would highly recommend the bed!

7
hours of sleep per night
Sleeps with a partner
Spectacular sleep
Thomas Miller
Verified Casper Owner
Moraga, California
31 years old
Feb 15, 2017
Spectacular sleep

I can't name a single bad thing about the mattress. I can't even name one single mediocre thing about the mattress. I bought a king size originally but then decided to opt for the cal king as it was a better fit since I'm tall and Casper helped me give away the king, and sent a brand new cal king free of charge. I didn't even ask. Their customer service is so outstanding their praises simply cannot be sung enough. I've had one other memory foam mattress and it slept hotter than a super nova, but the Casper does it right. I look forward to melting into it at the end of every day (or night). If you are on the fence, make the leap, you won't regret it.

7
hours of sleep per night
Sleeps with a partner
The mattress is very comfortable for $900.00. Box base not worth purchasing.
Laura Smith
Verified Casper Owner
Jackson, Tennessee
Feb 15, 2017
The mattress is very comfortable for $900.00. Box base not worth purchasing.

My previous bed was a king size Tempur-Pedic mattress and box springs. Excellent, but was coming up on 18years old. Too expensive to replace so decided to try Casper mattress and also bought box springs. Of course mattress came first, three days later base came. What a joke. The base is a $300.00 square with wood slats. The mattress is comfortable but wish I had kept my two piece box springs and put the $300.00 back into savings. A true king size box springs is two pieces and can not come through the mail.

8
hours of sleep per night
Sleeps solo plus a dog
The best
Valerie Zinn
Verified Casper Owner
Boca Raton, Florida
Feb 11, 2017
The best

I would highly recommend this matress.I have back issues and have slept on too many matresses...this is the most comfortable bed ever.I am not stiff anymore.The box is a bit heavy with king so you might need help on 2 levels.

7
hours of sleep per night
Sleeps with a partner
Amazing Comfort, Value and Zzzzs
ASHLEIGH HENNING
Verified Casper Owner
Santa Barbara, California
31 years old
Feb 10, 2017
Amazing Comfort, Value and Zzzzs

My husband and I have been co-sleeping with our son since he was born in our queen bed. When our son turned two we realized we were truly having miserable sleep and were completely out of room in bed (not to mention we also have 2 cats). So we decided we needed a king and got to researching. MANY of our friends recommended Casper. We were impressed with the rave reviews, and loved the price point, so we took the leap. I am so glad we did. It took me a few days to get used to the new feel (we had a pillow top before) but now that I have adjusted I am obsessed. I notice I fall asleep so easily on it. Sometimes even when I want to stay up late watching tv lol!! Seriously anytime I lie down I drift into slumber. Also having a king size is incredible. I truly feel like I am having the best sleep in years and hubby feels the same. I think kitties and toddler approve too. Thanks Casper!

7
hours of sleep per night
Sleeps with multiple partners plus a cat
Best mattress I've ever had
Angie Q
Verified Casper Owner
Seattle, Washington
31 years old
Feb 06, 2017
Best mattress I've ever had

We replaced our bed three years ago with a new coil mattress and have slept poorly since. It wasn't the right bed for us, and we always came back from trips saying we slept so much better in hotels. I agonized over buying a new bed and finally decided to order a Casper after reading the 2017 Consumer Reports for beds. On unboxing: it was fun! It's impressive that it fits in a cardboard box, but be aware that it still weighs a lot. You'd have trouble wrestling the king bed up a set of stairs by yourself. On upgrading to a king: I'll never go back. I am (was) a restless sleeper and kept my husband up at night with kicking and space hogging. He barely notices me with the extra space, and the memory foam keeps me from moving so much. On the bed: I've always liked a firm bed and at first thought this was too soft. Just like the pillows, the top layer is super soft while the inside is super supportive. My back feels so much better and I'm way more rested when I get up because I actually slept instead of tossing around all night. Overall, I'm thrilled with this purchase. I went from loving staying in a hotel for the comfy bed to hating hotels because my bed is so much better. The only downside I can come up with is that it has a bit of a smell when you first open it, but ours went away in about a week and it never bothered me much anyway.

8
hours of sleep per night
Sleeps with a partner

HOW WE DESIGNED THE PERFECT MATTRESS

SEE THE PROCESS