Serta Deluxe 12-inch King-size Memory Foam Mattress

Included Warranty: 20 year Limited Manufacturer
Select an option before changing warranty
The Rewards Program that Pays for Itself
  • EARN 5 to 40%
    Earn 5% in Club O Rewards on every order & up to 40% on select items.
  • FREE SHIPPING Every Order, Every Day*
    No matter how big or small, your order always ships for free.
    Dedicated customer service and early access to exclusive deals.
    Club O pays for itself, or we make up the difference
Today: $599.99
MSRP: $1,129.99 $530.00 (47%) off
Free Shipping*
  • Delivery Estimate

    Select a Product Option to view shipping

    • Product Alerts

      Stay in the know! Choose which alerts you’d like to receive on this product.

    Serta Deluxe 12-inch King-size Memory Foam Mattress
    • Wishlists
    • Save for Later
    Made in USA

    The Serta Deluxe 12-inch King-size Memory Foam Mattress offers a truly luxurious, deeply restful sleep experience. Three foam layers are each designed to provide a unique sleeping benefit.


    ITEM#: 15847535

    The Serta Deluxe 12-inch Memory Foam Mattress offers a truly luxurious, deeply restful sleep experience. Three foam layers are each designed to provide a unique sleeping benefit. The top layer is premium memory foam for a balanced combination of cradling comfort and gentle support. The middle layer is made of premium air channel foam for enhanced air circulation and customized support. The base layer is made of premium support foam which adds stability and therapeutic support.

    • Premium, 3-layer design
    • 2.5-inch top layer premium memory foam for cradling comfort
    • 2.5-inch middle layer air channel foam for breathability, customized support
    • 7-inch base layer support foam for stability, long lasting durability
    • Beautiful, quilted cover for extra layer of softness
    • Maintains shape without flipping or rotating
    • Evenly distributes body weight
    • Minimizes impact of sleep partner's movements
    • Measures 12 inches thick
    • Density: 3 pounds
    • Cover care instructions: Spot clean
    • Resistant to dust mites, naturally antimicrobial
    • Originally designed for NASA, the space age foam cradles the body, reducing pressure points
    • Adjusts to body temperature
    • Improves circulation
    • Never needs turning
    • Can be used with existing frame
    • Great for platform beds and slatted frames
    • King dimensions: 12 inches high x 76 inches wide x 80 inches long

    Memory Foam Tips:
    • Remove from packaging within 72 hours to maximize foam expansion.
    • This product arrives very tightly packed. Unwrap and allow 48 hours to return to its original shape.
    • Being sealed in plastic packaging sometimes traps odors. Allow product to air for a few hours.

    Once opened this product is non-returnable.


    Mattress Type Memory Foam
    Thickness 12 Inch
    Memory Foam Type Foam Memory Foam
    Density 3 Pound
    Support Medium
    Mattress Top Specialty
    Product Features Antimicrobial Made in USA
    Recommended Foundation Type Bed Slats Box Spring Platform
    Dimensions 12 in H x 76 in W x 80 in L
    Manufacturer Warranty 20 year Limited Manufacturer
    Materials Memory Foam
    Model Number MT43870KG3L

    Customer Reviews

    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    • Comfy

      Came folded in half and rolled, nifty for getting it up the stairs and in our room. Once unleashed and laid out took a good week for the deep fold in the center to go away. Slept in the guest room while we waited. When it finally took shape and we could sleep on it was super comfy...firm but not too firm for a good nights sleep.

      Read More
    • Love this mattress!!

      A friend of mine had the queen mattress of this brand and I visited her for a week last year,loved her bed. Finally found the king version last month, arrived super fast, smelled the first week or so...not too bad. Now its been almost a month and I love it, like I knew I would. My last memory foam was from online but was too soft and gave too easily, this Serta is more firm but very comfy and I dont sink in the bed like before. Cant say enough about this mattress:)

      Read More
    • Great product

      Hesitated to buy a mattress in line but was very pleased Make sure you open it up in the room you are going to set it up There was no odor but just in case we aired it out on our screened in porch for a few hours We slept on it the same night It took a few days to mild to our bodies we love it

      Read More
    • Amazing Value--Comfortable Name Brand Mattress

      We had purchased a version of this mattress for our son several years ago and have been vary satisfied with it. When deciding to move up to a king size bed, we were in for a big case of sticker shock when looking at traditional stores for mattresses. We decided to give overstock a shot, even though it was for a king size mattress. As with our son's mattress, it arrived in a rectangular box that in no way resembles a mattress. It looks ways to small and all wrong, but it is an eastern king 12 inch thick mattress in that box!! Be sure to unbox your mattress in the same location as you plan to use it. It will smell a bit funky for the first week or so. What helped us is to remove the bedding, including mattress pad, daily for the first week to help the smell dissipate. Open the windows if you can. It will stop smelling and relax into it's regular shape within the first week or so. Very comfy, great value. Literally thousands less than at a traditional store for a name brand (Serta) mattress...and without the huge delivery and set up charge a store will charge. Definitely recommend!

      Read More
    • Amazing mattress for the price.

      Better than expected. I was leery of wasting money on a cheap "foam" mattress, but since delivery, I have been extremely happy with the overall quality & comfort of this mattress.

      Read More
    • Nana

      After reading other reviews on this mattress, I took the advise of 1) unboxing it in the room and 2) propping it against an open window for one overnight to eliminate the odor; both excellent suggestions. The mattress is all you could want for comfort and design. As it is new, I cannot give any hints to longevity, only to a much better sleep and night.

      Read More
    • Great mattress...a little too firm

      This mattress is great. It arrived in 5 days after ordering it. It is the perfect height for our platform bed without a box spring. It has a lot of support but is a bit too firm. It's hard to buy a mattress online without testing it first! I thought the memory foam might soften up a little after a while but it didn't so we went ahead and bought a cheap memory foam mattress topper and put that on which made the mattress perfect. There is a lot of support from the mattress and the pad on top adds the perfect amount of cushion. Considering you can buy the same mattress on Amazon for **** more, I think this was a great deal and would absolutely recommend it.

      Read More

    Questions & Answers

    Get your product questions answered right here.
    • Why did you choose this product?

      • Son needed to upgrade his mattress. You had the best deal plus free shipping. I read the reviews and decided to give an on line order for such a big purchase a try.

      • Wanted a bigger bed. We have a serta memory foam mattress presently and love it.

      Read more Read less
    • Do you carry the bed frame in this picture?

    • Is this mattress packaged compressed in a box much smaller than the actual size of the mattress? If so approximately what is the packaged dimensions? Thank you

      • Hello Sparky, the approximate box dimensions are 41 inches high x 20 inches wide x 24 inches deep. This weighs approximately 104 pounds. Thanks for shopping with us!

    • I am really considering getting this mattress at this deal, but I'm scared of getting it and it having a great pet peeve of mine. HEAT! Some of the reviews say its a problem others doesn't. Is there any fair info you can give me and in the event of getting it and heat is an issue what are cost effective solutions to problem. I seen one review say they woke up sweaty. Really don't want that.

      • Hello Mike, memory foam does tend to retain body heat, if this is worrisome for you, then i would suggest going with a memory foam mattress that has gel, which will help to keep you cool. If you search for "king gel memory foam mattress" in our search bar, you will find a wonderful selection. Thanks for shopping with us! A.S.

    • isn't king size usually 80 X 80? Your dimensions state 76 X 80

      • Hello MrsEngley, that is correct on the dimensions, the standard for a king size mattress is 76 inches wide by approximately 80 inches long. Thank you for shopping with us!

    • how does this mattress compare to the Serta Pierta gel memory foam queen size mattress in terms of firmness

      • Thank you for the question beeno01. I am sorry but we do not have the information to compare the two mattresses together. This particular mattress has received very favorable reviews. I looked on other sites and can say that the Pierta also got favorable reviews especially when talking about heat dissipation. I am sorry I couldn't answer the question. Have a great day and thanks for visiting our site.

    • does this mattress come with box-spring bases?

      • Thank you for shopping with us prodgers35. This does not come with a foundation. Here is our selection of mattress systems. Have a great day.

    • Any warranty??

      • Hello njmsmom, this has a 20 year Limited Manufacturer warranty. Have a great day!

    • Hello how much does this mattress weigh

      • Hello jjbittinger, this is 104 pounds. Have a great day!

      • I do not know the exact weight but I can tell you that the average size person isn't going to be moving it alone. I can't move it even an inch. But that is one of the reasons I wanted it. Our previous mattress was like sleeping on a trampoline.

      • It took 2 of us to carry it upstairs.

      Read more Read less
    • Have you had any complaints about the odor of this mattress?

      • Hello golfingjays, we currently do not have any reviews on this item so there is no way for me to see any complaints. I just got my first memory foam mattress last month it also is a serta and it had no smell at all. These beds are so comfortable! Have a great day!

      • We did not notice too much of an odor at all. Guess we were lucky.

      Read more Read less
    • how come this has no reviews? I'm trying to see if this one is similar or as good as the 8-inch Serta Memory Foam Mattress.

      • Hello eliast, This is a new item so there are no reviews yet. From my experience with memory foam I think this one would be better than the 8 inch because it has Three foam layers where the other one only has 2. Happy shopping!

      • We got the 12. Very firm, we do like it and would buy it again, but it could be a little softer.

      Read more Read less

    Shopping Guides

    Shipping & Returns


    Usually leaves our warehouse in 1-2 business days. *

    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.
    More Details

    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
    Expedited shipping 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.