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Onlylucky King Size Mattress 12 Inch, Luxury Firm Hybrid King Mattress in a Box, 7-Zones Individual Pocket Springs, Extra Hip/Shoulder/Lumbar Support, Fiberglass-Free, CertiPUR-US

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$309.99 Why this price?
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Availability: In Stock.
Fulfilled by Amazon

Arrives Friday, May 15
Order within 5 hours and 27 minutes
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Style: 12 Inch


Size: King


Features

  • Pain Relief & Spine AlignmentOnlylucky firm king mattress features multi-layer memory foam and reinforced individual pocket springs for comfort and targeted support. The ergonomic 7-zone support system evenly distributes body weight, relieves pressure points and improves spinal alignment, offering softer cushioning at shoulders/hips while enhancing lumbar support to fully fit your body curves. Suitable for all sleeping positions, it helps reduce back pain for luxurious sleep.
  • Stay Cool & Comfort SleepFeaturing a Euro Top design for enhanced comfort, Onlylucky king bed mattress combines breathability with advanced cooling technology for optimal temperature regulation. It uses skin-friendly and breathable fabric that is fiberglass-free, effectively boosts breathability by 30%. The gel memory foam helps you stay cool and dry all night. The individual pocket spring system and egg crate foam layer improve air circulation delivers a comfortable sleeping experience.
  • Upgraded Enhanced Edge SupportOnlylucky king size mattress 14 inch is reinforced with 2.12.3mm perimeter coils and high-density support foam on the sides to prevent sagging. It effectively prevents body roll and expands sleep space, reduces the risk of edge roll during nighttime movement and improves convenience when sitting, lying down, and getting in or out of bed. The upgraded edge design also protects the internal structure and extends the lifespan of the mattress.
  • Motion Isolation & Quiet SleepOnlylucky king size memory foam mattress features hundreds of premium quiet individual pocket springs and slow rebound memory foam, effectively absorbing noise and vibration caused by turning over during sleep, minimizing motion transfer to your partner and allowing you to enjoy deep sleep without being disturbed, making it ideal for light sleepers.
  • CertiPUR-US Safety & 365-Night TrialOnlylucky king mattress in a box comes vacuum-sealed for easy transportation. Designed to fit most standard bed frames, it features convenient side handles for easy mobility and position adjustment. Onlylucky hybrid mattress king is CertiPUR-US certified, and we offer a 365-night trial and 24-hour customer assistance. For optimal comfort, please allow 24 to 72 hours for the mattress to fully expand.

Brand: Onlylucky


Size: King


Product Dimensions: 80"L x 76"W x 12"Th


Item Weight: 68 Pounds


Item Firmness Description: Firm


Top Style: Euro Top


Cover Material: Polycotton


Number of Layers: 8


Fill Material: Gel Memory Foam, High Density Foam, Memory Foam


Weight Limit: 800 Pounds


Item Firmness Description: Firm


Number of Layers: 8


Weight Capacity Maximum: 800 Pounds


Additional Features: Breathable, Fire Retardant, Low Motion Transfer, Pressure Relief, Temperature Regulating


Mattress Coil Type: Pocketed Coil


Construction Type: Hybrid


Number of Mattress Coils: 800


Size: King


Item Dimensions L x W x Thickness: 80"L x 76"W x 12"Th


Item Weight: 68 Pounds


Item Dimensions: 80 x 76 x 12 inches


Item Depth: 12 inches


top-style: Euro Top


Color: Grey


Style Name: 12 Inch


Brand Name: Onlylucky


Model Name: King Size Mattress


Product Benefits: Back Pain Relief, Improves Sleep, Posture Support, Pressure Relief, Reduces Toss & Turn, Stress Relief


Model Number: King Mattress 12 Inch


Manufacturer: Onlylucky


Unit Count: 1.0 Count


Cover Material: Polycotton


Fill Material: Gel Memory Foam, High Density Foam, Memory Foam


Mattress Comfort Layer Material: Comfort Foam, Gel Memory Foam


Material Type: Gel Foam, Memory Foam, Polycotton


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Friday, May 15

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.

  • Klarna Financing
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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Price is great
Style: 14 Inch Size: King
For the price it is a great mattress! It is firm but very comfortable! Thank you
Reviewed in the United States on May 6, 2026 by tim harris

  • Amazing!!
Style: 14 Inch Size: Queen
Amazing! As someone with back problems this bed works wonders especially for the price! It is firm as stated so if you are someone that likes a little cushion I suggest going for medium firm. Great quality and looks exactly like the pictures.
Reviewed in the United States on April 18, 2026 by Czerina

  • Satisfied
Style: 14 Inch Size: King
Nice firm mattress …
Reviewed in the United States on April 27, 2026 by Peter de lira

  • Amazing.
Style: 14 Inch Size: Queen
I love this mattress. It’s exactly what I needed
Reviewed in the United States on April 23, 2026 by Jasmine

  • Pretty Nice Product
Pretty nice mattress. Decompresses quickly and sleeps comfortably. Soft side is a bit of an issue, but not enough to be a deal breaker. Could be a little more plush and soft on top, but, overall, a good value and good quality for the money.
Reviewed in the United States on March 28, 2025 by Homer van Meter

  • Very comfortable
Style: 14 Inch Size: King
Finally a great nights sleep
Reviewed in the United States on April 12, 2026 by Lori Guthrie

  • Good fit
Good fit california king
Reviewed in the United States on August 19, 2025 by Victoria Lott

  • Good for those with back problems
The setup process was a breeze. Was able to go from vacuum packed roll to inflated bed capable of being used in about 4 hours. The depth and support given was sensational, giving a better night's sleep compared to standard mattresses I've used before.
Reviewed in the United States on November 22, 2025 by Randy J. Boyd

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