Onlylucky California King Mattress 14 Inch, Medium Firm Cal King Mattress in a Box, Hybrid Mattresses with Gel Memory Foam & Pocket Spring for Pressure Relief, Extra Edge Support, 365-night Trial
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Saturday, Dec 13
Size: California King
Style: 14 Inch - Medium Firm
Features
- Luxurious Comfort for SleepThe Onlylucky california king mattress 14 inch is constructed with innovative materials, featuring three layers of functional foam and individually pocketed coils system. The synergistic combination of gel memory foam and pressure relief foam effectively distributes body pressure while conforming to body contours, seamlessly adapting to diverse sleepers. As you sink deeper into the medium firm cal king mattress, the high density foam dynamically increases its support density, delivering an exclusive comfort experience.
- Advanced Cooling TechnologyThe Onlylucky california king memory foam mattress is made with finely woven, breathable fabric that allows air to flow freely, effectively dissipating steam and sweat from the surface to keep your body comfortable and dry all night long. Additionally, the increased foam content with egg-crate foam structure significantly improves internal airflow, preventing heat accumulation and ensuring you stay cool throughout the night.
- 7 Zoned Ergonomic DesignCrafted with ergonomic precision, our OnlyLucky california king size mattress features 7 distinct sleep zones that intuitively cradle your body's natural contours. This intelligent design distributes weight with perfect equilibrium, melting away pressure points while gently aligning your spine into its optimal position. Sleep that feels effortlessly supportive, leaving you waking refreshed, free from aches, and truly recharged.
- Zero Motion Transfer & Undisturbed SleepThe Onlylucky cali king mattress integrates an advanced pocketed coil system with hundreds of individually wrapped springs to prevent tangling. This design achieves zero motion transfer, ensuring undisturbed sleep whether sleeping alone or with a partner. The reinforced edge support maintains stability even when you sit or sleep near the edge, so you dont have to worry about rolling off.
- Enhanced Comfort and SafetyOnlylucky mattress california king is crafted with skin-friendly and fiberglass-free materials. All memory foam is CertiPUR-US certified, ensuring a healthy, luxurious sleep space. Enjoy a 365-night trial to test its balanced blend of support and cushioning, with no odor. It's the ideal pick for rest that feels both cozy and secure.
- Cal King Mattress in a BoxOur mattresses come in a box conveniently vacuum-sealed for effortless transportation and setup. After unboxing, please allow 2472 hours for the mattress to fully revert to its original shape. We also offer customer service and a tailored satisfaction guarantee, ensuring a seamless, satisfying experience from purchase to daily use.
Brand: Onlylucky
Size: California King
Product Dimensions: 84"L x 72"W x 14"Th
Top Style: Euro Top
Cover Material: Exquisitely Soft & Breathable Fabric
Number of Layers: 2
Fill Material: Gel Memory Foam
Weight Limit: 750 Pounds
Special Feature: Breathable, Fire Retardant, Low Motion Transfer, Pressure Relief
Color: Grey
Product Dimensions: 84 x 72 x 14 inches
Item Weight: 94.8 pounds
Manufacturer: Onlylucky
Item model number: 14 inch California King Mattress
Date First Available: October 11, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Dec 13
Yes, absolutely! You may return this product for a full refund within 30 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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- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Size: Queen
Style: 14 Inch - Firm
The media could not be loaded. I needed a new mattress and saw the reviews that this one stated that it was firm. I need it a firm bed and this did not disappoint exclamation first of all I am glad that I added the hallway service. My old mattress was removed and the new one was unwrapped and placed in my bedroom. They were able to place it exactly where it needed to go. Even though it came in a box it was quite heavy. It expanded immediately but by the third day it was extra full. I have had no back pains and have slept through the night since day one. This is a great purchase and it was reasonably priced. The mattress had no type of smell and it is very comfortable even though it is firm. I was unsure if it would expand to the full length but it has to wear my sheets don't even fit. I am very satisfied with this purchase
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Reviewed in the United States on November 8, 2025 by Mz.P.Will Mz.P.Will
Size: Queen
Style: 14 Inch - Medium Firm
Mattress is very comfortable, I got it as a guest bed and for when my husband snores too loud :) Slept on it all night last night, good and firm, the edges are a little soft, but still firm enough so you don't slide off. I would suggest this mattress to anyone looking for a nice firm, comfortable bed. Worth the price!
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Reviewed in the United States on November 21, 2025 by Gayle Cooper
Size: Queen
Style: 14 Inch - Medium Firm
I was very skeptical since there was not many reviews. First it came in and god! It was heavy! I gave it 3 days to fully expand and the first couple nights, I had to adjust to it as I was comfortable with my old one. But now it’s just so comfortable for me and my girlfriend. It’s very firm and it’s acceptable for the price of the bed. It was super easy to setup and it kinda cooling when on the bed. Other than that, we don’t sink toward the middle at all and it’s so tall! I do recommend this bed if you’re looking for comfort and that sinking problem!
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Reviewed in the United States on November 4, 2025 by Juan
Size: California King
Style: 14 Inch - Medium Firm
LOVE this mattress!! Crazy how a $400 mattress can be SO GREAT!! And now it's even less!!! I was suffering from major lower back pain from an old mattress. I started looking at new mattresses locally and I could not find one for under $1500. Paying for kids college tuition, the budget is tight and I did not want to go in to debt for a mattress. I asked friends and most recommended the hybrid mattresses. I started researching, found this one with great reviews and took a chance on it. Immediate back pain relief and so comfy!! I was worried about the firmness, it isn't too firm or too soft, it is perfection. Not sure how long it will last, but for right now it is perfect, and the price is right. If you are on the fence, try this one, you will be pleasantly surprised. You don't need to spend thousands on a mattress!!
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Reviewed in the United States on November 14, 2025 by Darlene McCormick Darlene McCormick
Size: Queen
Style: 14 Inch - Medium Firm
Great mattress and easy to set up
Reviewed in the United States on November 21, 2025 by Jenyne Riggs
Size: Queen
Style: 14 Inch - Medium Firm
Day three with this mattress. It has only expanded to 13 inches, which is ok. It is a lot firmer than anticipated. I am hoping with a litlle time it may soften up a bit. As others have mentioned, open the packaging carefully because it is pretty powerfull when it pops. For the price, I would recommend if you are looking for a very firm mattress for a relatively low price. If you're looking for something more medium firm this is not your mattress.
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Reviewed in the United States on November 23, 2025 by Barbara Johns
Size: Queen
Style: 14 Inch - Firm
This mattress is so comfortable. Great price. I used a foam mattress but had back pain. I have not had any pain since getting this mattress. I didn't realize how uncomfortable I was till I got this mattress
Reviewed in the United States on November 25, 2025 by RJ
Size: Queen
Style: 14 Inch - Firm
Excellent product
Reviewed in the United States on November 13, 2025 by roger d.