Serta Deluxe 12-inch King-size Memory Foam Mattress

by Serta
Sale: $512.99
MSRP: $1,129.99 $617.00 (55%) off
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ITEM# 15847535
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    • Warranty
      Included Warranty: 20 year Limited Manufacturer
      Select an option before changing warranty
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    ITEM#: 15847535

    Crafted with a deluxe three-layer design, this king-size memory foam mattress will send you off to a luxurious night's sleep. The thick and buoyant design features a top layer of premium memory foam and a middle layer of air channel foam that offers breathability and customized support. The 7-inch base layer provides firm, long-lasting support that will cradle your body while evenly distributing your body weight for a rest free of aches and pains. This mattress can be used with or without a box springs

    • King-size
    • Quilted cover 
    • 12 inches thick
    • Spot clean only
    • Improves circulation
    • Never needs turning
    • Resistant to dust mites
    • Naturally antimicrobial
    • Assembled in the USA
    • Premium, 3-layer design
    • Adjusts to body temperature
    • 3 pound density memory foam
    • Evenly distributes body weight
    • Can be used with existing frame
    • Cradles body to reduce pressure points
    • Great for platform beds and slatted frames
    • Minimizes impact of sleep partner's movements

    • 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
    • King measures 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 Quilted, Specialty, Tight Top
    Product Features Antimicrobial, Bed in a Box
    Recommended Foundation Type Bed Slats, Box Spring, Platform
    Size King
    Dimensions 12 inches high x 76 inches wide x 80 inches long
    Warranty 20 year Limited Manufacturer
    Model Number MT43870KG3L
    Country of Origin United States

    Customer Reviews

    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    • Most Helpful

    • Nana
      Verified Purchase

      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!!
      Verified Purchase

      Phenomenal mattress, best purchase ever. It has been two months and we are still so happy with it. It expanded great, and there was actually no smell for us like some other people complained of.

      Read More
    • Much firmer than I expected!
      Verified Purchase

      After sleeping on a mattress that was way too soft for years, we decided to buy one that was firmer. This mattress is very solid once it opens. It gives a little, but it's still much firmer than I expected. We will need to get a topper to soften it a little. It has good support and it's a great base, but I want a little more give on the top. It does not transfer motion and I can't even tell when my husband rolls over or gets out of bed. I was pleased to see that it was manufactured in the town I live in. Delivery was super fast.

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

      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
    • Most Recent

    • Mrs
      Verified Purchase

      Very comfortable. I am not sorry I bought this.

      Read More
    • Firm
      Verified Purchase

      its firmer than i was expecting. great quality.

      Read More
    • Comfortable sleep
      Verified Purchase

      I have purchased various memory foam mattresses, and this one is one of the more comfortable. A 12 inch mattress for this size of bed definitely makes a difference.

      Read More
    • Great mattress!!
      Verified Purchase

      This is my first memory foam mattress and I love it! So comfortable... doesn't make you sweat at night! It's medium firmness/softness. Right in the middle ( I like firm and my fiancé likes soft) & we both find it very comfortable. Great buy!

      Read More
    • Leslie Lott
      Verified Purchase

      I bought two of these mattresses but the second one was not as firm and somewhat didsppointing.

      Read More

    Questions & Answers

    • Q:

      "Just bought this mattress and the pamphlet & warranty docs in the box list Sleep Innovations & Innocor, but nothing about Serta. Is this really a Serta mattress?"

      • A:

        Our company, Innocor, was formerly Sleep Innovations and we manufacture some of Serta's products. I hope this helps.

    • Q:


      • A:

        Mattress can take up to seven business days to arrive. Timing can vary depending on inventory.

    • Q:


    • Q:

      "I have one last question! Which Serta bed is this? I don't see anything called Serta Deluxe on their website. Do you have an actual Serta model number or name?"

      • A:

        Serta makes several items that are are only offered by specific retailers, and may not be available for purchase on their web site. Unfortunately we are not aware of other model numbers associated with this item, however, we stand behind every item we sell and guarantee this is a authentic Serta product.

    • Q:

      "I have an existing box spring (1.5 years old) I'd like to use with this instead of buying something new right now. Someone recommended putting a sheet of 1/4 perforated plywood on top of it to help support the mattress. Is this a good idea?"

    • Q:

      "This mattress looks like it has a cover on it. Is that correct?"

      • A:

        Yes it has a removable cover and the bed sleeps great.

    • Q:

      "how much support are on the edges. My wife stays in the bed all day and we are having issues to find a bed with good support for the weight all day and will not sag"

      • A:

        The mattress is supportive on the edges. It contains 2.5 inches of premium memory foam that will support your body, 2.5 inches of air channel foam and 7 inches of density support form. With the proper foundation, the mattress will not sag and is protected with a 20 year warranty from Serta.

    • Q:

      "what are the shipping dimensions? does it come in a roll or folded in a box and if so what are the dimensions of the box I need to know this because I need to travel with it once it arrives"

      • A:

        The approximate box dimensions are 41 inches high x 20 inches wide x 24 inches deep.

    • Q:

      "what does the 20 year Limited Manufacturer warranty cover?"

      • A:

        The warranty covers any sagging or permanent depressions of an inch and a half or greater and any defects of the foam.

    • Q:

      "I see nothing about a firmness rating in the specs - how does this mattress rate for softness/firmness? Seeing as it's nonreturnable, I need to get it right the first time."

      • A:

        We do understand firmness rating is very important when ordering online. This item features medium support.

    • Q:

      "Wife is allergic to latex what memory foam mattresses are latex free"

      • A:

        Hello Roush6, the mattress is latex free. All the Serta mattresses on our site are also latex free. Thanks for shopping with us!

    • Q:

      "If I am dissatisfieed with the quality of the mattress, is there a refund or exchange program afforded by SERTA?"

      • A:

        Hello David, once opened this product is non-returnable. Please let us know if you have additional questions. Thanks for shopping with us!

    • Q:

      "Why did you choose this product?"

      • A:

        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.

      • A:

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

      • A:

        feel that Serta is a good brand

      • A:

        I liked the amount of gel memory foam combined with the 2nd layer that has cooling pockets. I also liked the 12 inch height.

      • A:

        We slept on one at a friends house and really liked it.

      • A:

        I need a new mattress and it is what I can afford. It sounds good to me.

      • A:

        Its Big

      • A:

        Name and PRICE

      • A:

        its the best

      • A:

        Recommended by friend. Firm / not hot

      • A:

        Looks like what I've been looking for AND the price was right! Hoping it will work out!

      • A:

        I have purchased a King mattress for my King size bed about eight yrs ago and we loved it, my son and his wife are now using it and they love it. I also bought my granddaughter a queen mattress for her bed which she likes a lot. So here I am purchaseing my third mattress (King size) and I'm sure I will like it as well.

      Read more Read less
    • Q:

      "Do you carry the bed frame in this picture?"

    • Q:

      "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"

      • A:

        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!

    • Q:

      "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."

      • A:

        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.

    • Q:

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

      • A:

        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!

    • Q:

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

      • A:

        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.

    • Q:

      "does this mattress come with box-spring bases?"

      • A:

        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.

    • Q:

      "Any warranty??"

      • A:

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

    Shopping Tips & Inspiration

    Shipping & Returns

    Contact Information

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

    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.
    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.