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Avenco

Avenco King Mattress 12 Inch, Medium Firm Memory Foam Mattress in a Box

Based on 1,051 reviews
Condition: New
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$299.99

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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Nov 2
Order within 6 hours and 56 minutes

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At a glance

Condition
New
Size
King (U.S. Standard)
Set
12 in
Model
B-M01905
Dimensions
80 x 76 x 12 in
Weight
69.7 lb
Color
White
In the box
mattress*1

Features 5

  • Optimal Freshness & Support - This Avenco king mattress uses breathable fabric and dual-layer foam. It enhances airflow while controlling moisture and odors. Enjoy a consistently fresh sleep surface all night long.
  • Targeted Comfort & Edge Support - The 12 inch king mattress offers excellent pressure relief by contouring to your body. Reinforced edges deliver firm edge support across all sleeping positions. This design ensures proper spinal alignment and comfort.
  • Great Value for Any Room - Premium comfort at an affordable price point. Ideal for guest rooms and dormitory use. This king size mattress features a durable, long-lasting cover construction.
  • Simple Home Setup Process - Your king mattress in a box arrives compressed for easy handling. Simply unroll and allow up to 72 hours for full expansion. The setup requires minimal effort and time.

Specs 35

Brand Avenco
Size King (U.S. Standard)
Product Dimensions 80"L x 76"W x 12"Th
Item Weight 69.7 pounds
Item Firmness Description Medium Firm
Top Style Euro Top
Cover Material Cotton
Number of Layers 2

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Nov 2

Yes, absolutely! You may return this product for a full refund within 90 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Affirm Financing
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  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

I will purchase again, great mattress!
Size: Twin Set name: 8 Inch
After ordering, it arrived very quickly. It was packaged well. There was no odor after opening the mattress. The mattress material is very soft feeling and very comfortable, and the mattress appearance is very nice. After it was taken out of the box it fluffed up very quickly, I am very happy with the support of the mattress, there is no sinking in when you sit on it or sleep on it, it does hold the body's weight very well, and the material used is very nice and cool to the touch for temperature of hot sleeping. I'm very happy with this purchase. I will purchase again! ... show more
Reviewed in the United States on September 30, 2026 by Christel
Worth every penny
Size: Twin Set name: 10 Inch
I honestly wasn’t expecting this mattress to be THIS comfortable! 😍 The 10-inch memory foam gives the perfect balance of softness and support without feeling like you’re sinking too far into it. It feels great on my back and sides, and I’ve been waking up feeling well rested in the morning. It also expanded nicely after opening and had a much more comfortable feel than I expected for the price. The medium-firm feel is just right — supportive but still plush enough to be cozy. If you’re looking for an affordable mattress that feels comfortable, supportive, and much more expensive than it actually is, I definitely recommend this one! ... show more
Reviewed in the United States on August 30, 2026 by Ashley Broxton
So comfy. I feel spoiled.
Size: Full Set name: 12 In
So far I have been sleeping on it for a few weeks and it’s perfect. My cat even gives it two paws up. It fluffed up quickly and was a lot of bang for the buck. I am so glad that I bit the bullet and got this one. It was exactly what I wanted.
Reviewed in the United States on September 7, 2026 by Brycen Tara
Great buy!
Size: King (U.S. Standard) Set name: 12 In
I have zero complaints about this mattress. I was worried it wouldn't reach 12 inches, but after three days it did eventually reach 12 inches. It's a medium firm, which gives great support. My last mattress was a firm mattress and I could never sleep on my side or stomach without it causing me to have back pain. This mattress allows me to sleep any which way I please. It was worth every penny. ... show more
Reviewed in the United States on September 2, 2026 by Penny
Comfortable despite bad experience
Size: Queen (U.S. Standard) Set name: 10 Inch.
I like a soft, plush queen mattress. I previously used a far more expensive foam layered mattress that I cannot match online. Most hotels use a medium firm and I find them stiff and horribly uncomfortable; I don't weigh enough for memory foam to be comfortable either, and as such I specifically wanted the mattress marked "soft". It was in stock, I added to my cart and checked out - but was not allowed to complete my purchase as an error claimed "the item could not be sent to my address". After much back and forth with several incompetent customer service people who claimed both that I could and could not buy the item, it would seem that the seller placed an arbitrary restriction on some items due to the digital coupon available and that I could only purchase a mattress that was available locally in specific warehouse locations - information I have absolutely no access to order influence over. As there was absolutely no way of knowing if the "soft" mattress would ever be available and I was tired of sleeping on an air mattress I downgraded to the medium 10 inch and was able to purchase normally. It shipped per estimated time, packing was average, and I left it open overnight to inflate. It never expanded past maybe 9 inches (similar to other reviews) so it doesn't quite match the product description, but even that first day it was soft and makes absolutely no noise if I sit down, roll over etc. I have now been sleeping on it for about a month, and it's comfortable. It isn't particularly hot, even if the covers are warm, it doesn't move around and I sink enough to be comfortable but not so much as to misalign anything, much like a pillow. It is likely not good to sit on all day for wfh, but quite adequate for a good night's sleep for someone under 150 lbs (too many products just ignore anyone under 6ft or 200lbs). I have not noticed any sort of smell or unevenness, nothing to aggravate my allergies, and plan to rotate the mattress from the headboard to the foot end per instructions every 3 months. Overall I would recommend this mattress, as it meets my needs, but expect the soft version may have been even more to my liking. The difficulty in actually placing the order cost a star, as I would give the seller a 2/5 for not letting me access the product I originally wanted. ... show more
Reviewed in the United States on September 15, 2025 by Readaholic
⭐ “My Bed Is So Comfortable Now I Don’t Even Want to Leave It” 😂🛏️✨
Size: Queen (U.S. Standard) Set name: 14 Inch
This mattress has been AMAZING 😍💅. It’s the perfect mix of soft and supportive — comfortable enough to sink into and relax, but still firm enough that I don’t wake up feeling like my back lost a fight overnight 😂✨. I got the 14-inch version, and it makes my bed feel extra luxurious and plush. Between this mattress and my tall bed setup, climbing into bed every night honestly feels like checking into a fancy hotel 💖🛏️. It expanded nicely after opening, didn’t have a strong smell, and started feeling comfortable really quickly. I also appreciate that it stays cool while sleeping because I hate waking up feeling overheated 😭🙌. The quality feels way better than I expected for the price, and I’ve been sleeping SO well since getting it. Definitely a 5-star purchase for anyone wanting comfort, support, and a bed that feels like a giant cozy cloud ✨💕 ... show more
Reviewed in the United States on May 6, 2026 by Miss Woods
Great budget mattress
Size: King (U.S. Standard) Set name: 12 in
This mattress is comfortable, definetly not a bad option on a budget. I’ve been using it for close to a year, still maintains form no problem. If you have cats keep them OFF. You do not want animals picking the material, especially if you’re washing your sheets and it’s just the bare mattress. Also to clarify how it is shipped in case there is any confusion. It comes in a decent size box, actually seems kind of small especially if you order a king. You get it out of the box, it’s very tightly wrapped and vacuum sealed. As soon as you tear the plastic, it starts to decompress and takes around 24-36 hours to fully expand. So have some room available before you let it decompress and also make sure you do it where the mattress is going to be staying. This isn’t a typical mattress so moving it is an absolute pain especially if you have stairs. ... show more
Reviewed in the United States on May 30, 2026 by luke
GAVE ME BAD BACK PAIN
Size: Full Set name: 10 inch
I bought this mattress because I saw so many reviews saying it was great and that people felt supported, especially with back problems. I have an arched back, so I thought this might finally be the mattress that works for me. Two days in, I woke up with the most intense back pain I've ever experienced. I literally struggled to get out of bed. I decided it time because I thought maybe my body just needed time to adjust, but it never got better. I literally gave it 2 MONTHS and it still gave me horrible back pain. I even bought a mattress topper hoping it would help, but it barely made a difference because this mattress is HARD. At this point, it might as well be a brick. It feels like I'm sleeping on rocks rather than a mattress. I also ordered the 10-inch version, and after several days it only expanded to around 8–9 inches instead of the advertised 10 inches. Do not buy this mattress if you're looking for something soft or comfortable. Maybe it works for some people, but my experience was completely different from what I read in the other reviews. It is firm. Very firm. A BRICK. I had to buy a different mattress. So save your coins, dont get it. ... show more
Reviewed in the United States on August 28, 2026 by vaness
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