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Serta Deluxe 12-inch King-size Memory Foam Mattress

Today: $528.49
MSRP: $1,129.99 $601.50 (53%) off
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ITEM# 15847535

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ITEM#: 15847535

This deluxe king-size memory foam mattress by Serta features three layers of memory foam to give you a luxurious sleeping experience. The thick and buoyant heavy-duty 12-inch mattress evenly distributes body weight and maintains its shape without flipping or rotating. This supports rest without incurring aches and pains from improper sleeping positions. This memory foam mattress works with slat or platform beds, with or without a box spring.

  • Assembled in the USA
  • 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
  • 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, Bed in a Box
Recommended Foundation Type Bed Slats, Box Spring, Platform
Dimensions 12 in H x 76 in W x 80 in L
Warranty 20 year Limited Manufacturer
Model Number MT43870KG3L
Country of Origin United States

Customer Reviews

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  • Most Helpful

  • 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.

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  • Much firmer than I expected!

    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.

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  • 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.

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  • Most Recent

  • Great Mattress for Price

    This bed sleeps great. For once a medium firmness is truly a medium firmness. I recommend this bed for those who want comfort and support.

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  • Best night sleep I had.

    I suggest you to buy a pillow top cover. I purchased this mattress a little over 2 months ago and I am in shock about how nice it is and can't stop telling my friends. The only reason why I didn't give it a 5 stars was because it really needs a pillow top cover which I bought days after. It really made the mattress feel cooler and a bit softer because it a little hard, but a good hard to me. Not a bad hard that makes it uncomfortable.

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  • Amazing for the price!!!

    I can't believe how comfortable this mattress is. I was so worried because of the price and the way it was shipped but don't be fooled. It has a perfect firmness to it... great look, and even better price.

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  • king size serta memory foam mattress

    we love it. had ordered one in 2012 for son's full size bed and it has held up so well we ordered one for our king size bed.

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  • Great mattress

    Worth for the price and very comfortable

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Questions & Answers

  • 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

    • 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.

  • 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

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

  • what does the 20 year Limited Manufacturer warranty cover?

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

  • 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.

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

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

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

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

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

  • 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.

    • feel that Serta is a good brand

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

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

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

    • Its Big

    • Name and PRICE

    • its the best

    • Recommended by friend. Firm / not hot

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

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  • 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.

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  • 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.

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  • 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 Tips & Inspiration

Shipping & Returns

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.

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