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Serta 8-inch California King-size Memory Foam Mattress

by Serta
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ITEM# 12116772
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ITEM#: 12116772

This Serta two-layer design is proven to give you a better night's sleep, it evenly distributes your body weight better than a traditional inner spring mattress for a personalized sleep experience that always feels just right. The premium memory foam comfort layer adapts to you to relieve the painful pressure points that cause tossing and turning. The base layer provides the comfortable support and stability your body needs. .

  • 2-inch memory foam comfort layer
  • 6-inch premium base layer for superior support
  • Distributes body weight better than traditional inner spring
  • Relieves painful pressure points
  • Holds its shape, no flipping or rotating required
  • Breathable cotton cover
  • Use with your existing box spring and frame, or platform bed (with no box spring)
  • Eliminates motion transfer between you and your partner
  • Improves circulation
  • Dimensions: 8 inches high x 72 inches wide x 84 inches long
    Memory Foam Tips:
  • Remove from packaging within 72 hours of receipt to maximize memory foam expansion
  • This product arrives tightly packed in a box sized to be portable; once you unwrap it, you can sleep on it the same night, although it may take 48 hours to return fully to its original shape.
  • Memory foam is inherently comfortable and supportive, no matter how firm it feels; similar items can vary in firmness due to the nature of the foam
  • Product is vacuum sealed at the factory for efficient shipping; vacuum sealing sometimes traps odors, but once opened, a few hours of airing will usually remove the odor
  • Due to machine-cutting manufacturing processes, there may be slight variances in the dimensions of this product.

Due to the nature of Memory Foam the firmness level of every item is unique. Please be advised that even similar products may produce different firmness results.


Mattress Type Foam, Memory Foam
Thickness 8 Inch
Support Medium
Mattress Top Specialty
Product Features Bed in a Box
Recommended Foundation Type Bed Slats, Platform
Size California King
Dimensions 72 inches wide x 84 inches long x 8 inches deep
Model Number MT116397X
Country of Origin United States

Customer Reviews

5 Stars
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  • Most Recent

  • chautlady
    Verified Purchase

    Very good product. Holding up very well. Would recommend to anyone needing a nice soft system for sleep. Easy on the joints.

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  • Great over the last five years!
    Verified Purchase

    We have had this now for five years as we purchased in 2011, it is still as good today as ever. Highly recommended and I would buy another in a heartbeat if we needed one.

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  • Dreamy
    Verified Purchase

    This is my second time to purchase this mattress (the first one I bought was a full size). I never sleep as well or as comfortable on any other mattress. I've had a bad back for years. When I initially purchased this mattress as a full size, my back problems completely subsided. When it was time to get a larger mattress, it was a no brainer which one I would buy. I am sublimely happy w/ the cal. king. Still no back problems. It adjusts to cradle you and the natural curvature of your body. It can get a little warm, but a plush mattress pad completely solved that problem.

    Read More
  • Poor Mattress
    Verified Purchase

    Mattress is doubled in half and sent in a box. This doubling the mattress caused a bump down the middle that makes the mattress not flat. Terrible mattress so I guess i get what I pay for. I do say that this company has excellent customer service and sent me another one. Unfortunately they again sent it in the same package that caused the exact same damage.

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  • Surprisingly Amazing
    Verified Purchase

    It comes in a box. It's cheap. It's sight unseen. You're worried. It makes sense. I felt the same way, but we went for it anyway as it's hard to find California King beds in Canada, so it was worth the shot... and did it ever pay off. Best. Bed. Ever.

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  • Most Helpful

  • Fantastic Bed, Fantastic Experience!
    Verified Purchase

    First, I really appreciate that other people left reviews really made me feel comfortable making a purchase like this (online, without testing it) and in deciding on this specific memory-foam mattress. I purchased this mattress at Overstock on a Friday, got free shipping (with the O Club Membership---which immediately pays for itself) and it arrived the next Tuesday! **** You may want to sign up on Overstock's Site as a regular member before your purchase, as they send out 10% e-mail coupons **** As other reviewers stated, it's hard to believe that a California-sized king bed can come in a box that's roughly four feet high by two feet wide (87 pounds), but it does..... and it's perfectly fine! The bed comes in a plastic bag that is surrounded by a stronger threaded plastic outer layer (which keeps it compressed), and then of course the shipping box. You just simply take the bed out of the box, place the wrapped bed on your frame or box springs, carefully cut the outer layer off with scissors, and then watch your bed grow to full size! Remove the lighter inner plastic cover and you're ready to go. My wife has a very good sense of smell and said she could barely detect an odor from the bed. Once you let the bed stretch a little (5 minutes), the instructions say that it's perfectly O.K. to lay on the bed and sleep on it immediately, which we did. We kept our existing bed springs and just replaced our mattress. This 8" Serta exactly replaces the length and width of the Cal King mattress we had and we use regular Cal King sheets with it. It also is a full 8" high, as described. The comfort of this bed is fabulous. Because it's a memory foam bed, it adjusts to your size and weight and then sort of molds you into it. It is a bit firm, in the sense that once you sink in it stops moving. As others have noted, because this mattress is probably unlike anything else you've ever slept on, it's just feels different at first and it takes a short while to adjust to this feel. What feels like firm at first feels great a couple of days into sleepng on it and the discomfort and pain we had been feeling from our old spring mattress just disappeared!!! The only way I can describe it is that it feels like there's nothing around you, as if you were laying directly on the ground, but yet it's super comfortable ---- i.e. natural!!! A great feel and experience! By the way, one concern we had was that it might heat up with our body temps and be too warm--- we've found just the opposite and find both the comfort and the coolness to be excellent. If you're a light sleeper and your partner comes to bed later, you'll love this bed. I'm a night person and my wife says she doesn't ever wake up now / know that I came in later!!!! We joked there's not enough hours in the day to enjoy our bed and are both loving it. Again, like others mentioned, you can always add an affordable feather top if you need more of the spring-like cushion that a traditional mattress provides....we're happy with the way it is and are sleeping better than we ever have! Finally, I just used our O Rewards (credit, after joining the club, from your purchases toward future purchases) toward an area rug with, of course a 10% off coupon.... and the product and delivery were once again, perfect. I am a customer who expects very good service and have been totally thrilled with the e-mail communications, tracking numbers, and everything that Overstock has provided us in our experiences so far! Happy shopping to all of you and thanks to Overstock for the value and the service--- we will definitely be shopping with them again in the near future!!!

    Read More
  • Great mattress
    Verified Purchase

    I really struggled about buying a mattress online, but I bit the bullet and bought it anyway. I have been sleeping on a waterbed for the last 27 years and was concerned about sleeping on a regular mattress. I chose the memory foam for the comfort of conforming to my body. I have not been disappointed at all. I have slept extremely well since the first night. I was concerned because it came in such a small box, but the minute you let air in it "grows". The other reviews stated there would be an odor, but I did not experience any odor at all. The mattress fits in my waterbed frame well. The only negative I can say is that I wish I had gotten the 12" instead of the 8". I fills the frame but is slightly lower than the side rails. I love this mattress. I would recommend it to everyone, as a matter of fact I have recommended it to several people. I look forward to many restful nights!

    Read More
  • Memory foam was just as advertised.
    Verified Purchase

    I have suffered with low back pain for years. The memory foam is very comfortable and has sure helped my pain.

    Read More
  • Great product!
    Verified Purchase

    We've bought 4 of these to date - one for each RV, and 2 beds in the house - after 2 previous back surgeries, never slept better! NO issues of any kind with shipment, delivery, unpacking, or installation - all as advertised, and better!

    Read More
  • Best Purchase Made Online
    Verified Purchase

    This mattress was a great buy. It was worth the price. I don't wake up with back pain anymore, but I also have a magnetic mattress pad on top of it as well. It's so comfortable. My old mattress would sag and I would roll into my husband but that no longer happens. The shipping was quick as well. It came in a big box. You have to remove your old mattress first and then unroll it on top of the bed frame. The California King size was perfect. It had a smell but once I put the magnetic mattress pad and sheets on top I could not smell it. If you sign up for Omail you get a 10% discount. That discount saves you a lot of money. I really really love this mattress! My husband does too. It was the best money I spent and a great deal. I would buy another one and tell everyone about this mattress from FYI, Serta is made my Sleep Innovations.

    Read More

Questions & Answers

  • Q:

    "does this mattress come with a mattress cover?"

    • A:

      Hello serenitysmommy30, yes, this mattress Includes a luxurious, smooth jacquard 62-percent polyester/38-percent cotton eco-friendly cover. Thank you for shopping with us.

  • Q:

    "does this mattress come with a foundation?"

    • A:

      Hello rls1536, this does not come with a foundation. Have a great day!

  • Q:

    "Is this the same mattress as Serta's Cool Elegance Collection line that's sold by Sleepys?"

    • A:

      Hello ncapelane, I'm sorry that information is not available. Have a great day!

  • Q:

    "How much does this mattress weigh?"

    • A:

      Unfortunately, at present, this item is presently out of stock. We currently do not have inventory to check, and cannot guarantee the item will be restocked. Please feel free to check back with us periodically to see if the item has returned.

  • Q:

    "can you deliver this mattress to China?"

    • A:

      If you add this item to your cart and proceed through check out it will tell you if it can be delivered to your area in China.

  • Q:

    "does it comes with the bed frame?"

    • A:

      No, it does not.

Shopping Tips & Inspiration

Shipping & Returns

Contact Information
Shipping Information:

Our standard shipping method is ground shipping. We also offer expedited shipping for most items. Your final shipping cost and estimated delivery timeframe will be available at checkout.
Standard shipping details
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Mattress Return Policy:

Mattress Sets are non-returnable upon signature at delivery. Mattresses are non-returnable if opened or taken out of their plastic wrapping.
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This item cannot be shipped to Alaska or Hawaii. More details

For your protection, all orders are screened for security purposes. If your order is selected for review, our Loss Prevention Team may contact you by phone or email. There may be a two business day delay to process your order.

** Most Oversize orders are delivered within 1-4 weeks. Some orders may take 6 weeks to be delivered.