Onlylucky Firm King Mattress, 14 Inch Hybrid King Size Mattress in a Box, Gel Memory Foam & Pocket Springs for Back Pain Relief, Extra Lumbar & Shoulder Support, Motion Isolation, 365-night Trial
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Returnable until Jan 31, 2026
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Size: King
Style: 14 Inch - Firm
Features
- Luxurious Comfort for SleepThe Onlylucky 14 inch king size mattress 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 firm king mattress, the high density foam dynamically increases its support density, delivering an exclusive comfort experience.
- Advanced Cooling TechnologyThe Onlylucky king size 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 king 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 hybrid 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 king bed mattress 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.
- 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: King
Product Dimensions: 80"L x 76"W x 14"Th
Item Firmness Description: Firm
Top Style: Euro Top
Cover Material: Exquisitely Soft & Breathable Fabric
Number of Layers: 3
Fill Material: Gel Memory Foam, High Density Foam, Memory Foam
Weight Limit: 800 Pounds
Special Feature: Breathable, Fire Retardant, Low Motion Transfer, Pressure Relief
Product Dimensions: 80 x 76 x 14 inches
Item Weight: 108.8 pounds
Manufacturer: Onlylucky
Item model number: 14 Inch King Mattress
Date First Available: September 5, 2025
Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
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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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: 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 - 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.
Love this mattress! I needed a firm one and this is it! So comfortable! I sleep on my side\tummy and it’s perfect.
Reviewed in the United States on November 5, 2025 by Shannon
Size: California King
Style: 14 Inch - Medium Firm
I have a Cal King frame and I bought thid mattress for the frame. The mattress is about 82" NOT 84. The width is perfect. I got Medium Firm and it is nice. Im a side sleeper and it feels good. The edges arent as firm as other reviews say.
Reviewed in the United States on December 18, 2025 by Bridgetta
Size: California King
Style: 14 Inch - Medium Firm
If you are a memory foam die hard, this mattress is not for you. I have been sleeping on memory foam since 2006 and this does not feel like a memory foam. I can hear the springs every time o move in bed. I don't feel them, but I do hear them. My first night on the bed, after only letting it cure for around 6 hours, it was extremely bouncy. After 24hrs, it is barely bouncy. A week later, it still has a minimal bounce, it is quite firm. I am missing the memory foam feel too much, so I am sending this back.
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Reviewed in the United States on November 9, 2025 by Pam Poovey
Size: Queen
Style: 14 Inch - Firm
Very comfortable for my back pain.
Reviewed in the United States on December 4, 2025 by Donte Wilson