FATHOM Firm King Mattress 14 Inch Memory Foam Mattress King Size Bed in a Box for Back Pain Relief and Cool Sleep with Gel Foam and Removeable Fiberglass Free Cover, CertiPUR-US Certified
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To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Thursday, Jun 4
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Size: King (U.S. Standard)
Style: 14 Inch
Pattern Name: Firm
Features
- Advanced Cooling Comfort: The AeroFusion gel memory foam mattress ensures exceptional breathability and heat dissipation, adapting precisely to your bodys contours while resisting temperature sensitivity. Enjoy cool, cradling comfort no matter the season.
- Premium, Thoughtful Design: Wrapped in a soft, geometric-patterned jacquard fabric with stylish light gray graphene yarn borders. The fiberglass-free mattress cover is not only elegant but functional, featuring a zipper for easy removal and cleaning.
- Motion Isolation Technology: Dynamic memory foam mattress contours to your bodys unique curves, filling gaps to support optimal spinal alignment while effectively lowering motion transfer and noise, ensuring a serene and undisturbed sleep environment where everyone wakes up refreshed, ideal for couples and kids.
- Certified Safe Material: Crafted in the USA with CertiPUR-US foams and globally sourced Oeko-Tex certified fabrics, our king mattress is free from harmful substances. Backed with a 10-year protection, Fathom mattress is designed to promote spinal health and long-term durability for a healthy lifestyle.
- Effortless Setup: The Fathom mattress in a box is vacuum-packed, compressed and rolled for easy movement and installation. Simply open and unroll your memory foam mattress, then enjoy it within 72 hours for full expansion.
Brand: FATHOM
Size: King (U.S. Standard)
Product Dimensions: 80"L x 76"W x 14"Th
Item Weight: 97 Pounds
Item Firmness Description: Firm
Top Style: Gel Top
Cover Material: Polyester
Number of Layers: 3
Fill Material: Gel Memory Foam, Memory Foam
Weight Limit: 750 Pounds
Item Firmness Description: Firm
Number of Layers: 3
Weight Capacity Maximum: 750 Pounds
Additional Features: Breathable, Durable, Low Motion Transfer, Pressure Relief, Temperature Regulating
Construction Type: Memory Foam
Size: King (U.S. Standard)
Item Dimensions L x W x Thickness: 80"L x 76"W x 14"Th
Item Weight: 97 Pounds
Item Thickness: 14 Inches
Item Dimensions: 80 x 76 x 14 inches
Item Depth: 14 inches
Cover Material: Polyester
Fill Material: Gel Memory Foam, Memory Foam
Mattress Comfort Layer Material: Comfort Foam
Material Type: Gel Foam, Memory Foam
top-style: Gel Top
Color: Firm
Style Name: 14 Inch
Brand Name: FATHOM
Model Name: Fathom Firm 14" K
Product Benefits: Back Pain Relief, Improves Sleep, Pressure Relief, Reduces Toss & Turn, Stress Relief
Model Number: Firm 14 K
UPC: 840418684047
Mattress Type: Standard Mattress
Manufacturer: FATHOM
Set Name: King 14 Inch
Manufacturer Part Number: FA14KFRT
Unit Count: 1.0 Count
Included Components: Memory Foam
Age Range Description: Adult
Item Type Name: Bed Mattress Conventional
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jun 4
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Queen (U.S. Standard)
Style: 12 Inch
Pattern Name: Firm
So where to begin, we have been in search for over a year now for a replacement mattress that is firm but comfortable to help alleviate sciatic back aches. We have tried several brands ranging from expensive to avg price. All returned back because they either weren't firm as stated and didn't help with back aches. Finally decided to try this Queen mattress, after researching and reading reviews/videos etc... you name it! OMG, if you are in search for a true firm mattress this is it! I was hesitant because I never had heard of this brand and at a lower price range (on sale), but even at regular price it's truly great quality & value. Now after having it for a few months, I can happily say that my hubby no longer feels aches and we both feel rested in the mornings. Best part it had No odor, expanded rapidly, and we were able to sleep on it after waiting 24 hrs. We opened it in our living room area as we didn't think it would expand so rapidly but was pleasantly surprised that it did, see pics, and that was not even after 2 hrs. On a different note, it took me maybe 2 weeks to adjust since it's definitely firmmer than the mattresses I had in the past. The good thing is that adding a memory topper would help if necessary. So far, I am really happy with the purchase and glad I took the leap in getting it! The cover is made of high quality material has a zipper for easy washing.
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Reviewed in the United States on March 13, 2026 Reviewed in the United States on March 13, 2026 by ThePhoenix
Size: Queen (U.S. Standard)
Style: 10 Inch
Pattern Name: Firm
I am extremely impressed with this memory foam mattress! It has the perfect firm support—just what I needed for a restful night’s sleep. The quality is outstanding: it feels sturdy yet comfortable, contouring to my body without feeling too soft. I’ve noticed less back discomfort since I started using it. Breathable and well-made materials, it doesn’t trap heat, so I stay cool all night. 😊 The mattress arrives in a compact box, maaking it easy to carry. Easy to set up, it inflates right away and holds its shape beautifully. Definitely worth every penny for anyone looking for a firm, supportive, and long-lasting mattress.
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Reviewed in the United States on April 1, 2026 by Emma B
Size: Queen (U.S. Standard)
Style: 12 Inch
Pattern Name: Firm
I recently purchased this Firm Queen 12-Inch Memory Foam Mattress, and I’m very impressed with its quality and comfort. The mattress arrived quickly and was easy to set up right out of the box. It expanded to its full 12 inches within a few hours. The firmness level is perfect for anyone who needs extra support, especially for back pain relief. I’ve noticed a significant improvement in my sleep quality, and I wake up with less stiffness in my back. The gel foam layer keeps the mattress cool throughout the night, which is a big plus for me as a warm sleeper.
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Reviewed in the United States on February 28, 2026 by Y Review
Size: Full
Style: 12 Inch
Pattern Name: Firm
This is one of the best quality mattresses for the price. I bought this for my father in law and was so impressed. It was firm, yet had enough give that it was quite comfortable. I got it because of the ratings and can verify that it is indeed a really nice quality firm mattress for the price.
Reviewed in the United States on May 28, 2026 by karen l.
Size: Twin
Style: 8 Inch
Pattern Name: Firm
My previous mattress was pretty good quality with innersprings and a nice pillowtop, but every morning my back ached because it was too soft. This Fathom Firm 8" Memory Foam mattress is the bomb! I wake up pain free now. It's firm enough to offer support but still comfortable. I'll be buying another one soon to put in the living quarters of my horse trailer!
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Reviewed in the United States on May 28, 2026 by Aussielover
Size: King (U.S. Standard)
Style: 12 Inch
Pattern Name: Firm
I had a Sleep Innovations for many years. A few in fact. I was setting up a new house. They don't seem to be around as much so I thought I would try this. Same price point. The mattress is very firm so far which I like. It had a slight odor to it when it was first opened. I let it breathe and opened a window. It did go away quickly. For the money it is a good mattress. Time will tell if it holds it firmness. Stitching is not perfect but that won't affect the sleeping.
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Reviewed in the United States on March 25, 2026 by genius
Size: Full
Style: 12 Inch
Pattern Name: Firm
I am not a good sleeper no matter how expensive the mattress. This mattress doesn't quite match up to my $1800 mattress, but it is close enough for me to give it 5 stars. I purchased the firm and it is very firm with a slight cushioning effect. I added a high-loft mattress cover and it is very comfortable. I am 5'2" and over 60 and had absolutely no trouble opening and setting up the Fathom mattress. The mattress inflated quickly and I did not use the bed for the first 72 hours. There was no smell at all and there is no noise at all. Now, if I can just find pillows I like as much as this mattress...
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Reviewed in the United States on May 5, 2026 by BMuse
Size: Full
Style: 10 Inch
Pattern Name: Firm
If you’re looking for a very firm, but comfortable mattress, this is it. It’s firm, but it has a soft top layer for comfort. I didn’t know if I was going to like it in the beginning because it was so firm, but I’ve had it for almost a month and I’ve gotten the best and deepest sleep I’ve ever had. Highly recommend! Doesn’t have an odor either. Seems very durable and is a great value for the money. Didn’t take very long for it to inflate to full size, making it easy to use.
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Reviewed in the United States on March 15, 2026 by BD