King Size Mattress - 12 Inch Hybrid King Size Mattress in a Box, Upgrade Strengthen, Gel Memory Foam King Matress with Motion Isolation, Strong Edge Support and Pocket Springs, Medium
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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.
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Size: King
Style: 12 Inch Medium
Features
- Breathable & ComfortableKing size mattress curated with high-end fabrics for a soft, silky touch. Exclusive knit fabric technology is both breathable and sweat-wicking and keeps you warm for the perfect sleep experience
- Unparalleled Sleep EnjoymentMattress King size has a patented supportive technology that ensures every part of your body fits perfectly for unprecedented relaxation, effectively relieving fatigue and allowing you to have a better night's sleep
- Perfect Scientific CombinationKing bed mattress is made of individually pocketed springs and multiple layers of premium memory foam, expertly layered in our high-quality memory foam and ultra-high-density base foam for ultimate support
- King Mattress in a BoxUnlike the traditional 2 coils, we offer the Hybrid Mattress with the addition of 3 coils, which enhances the mattress's edge support and superior barrier against the effects of your partner's movement. Achieve a quiet and comfortable deep sleep
Brand: SIMARTH
Size: King
Product Dimensions: 79.92"L x 75.98"W x 12"Th
Top Style: Pillow Top
Cover Material: Skin-friendly fabric
Number of Layers: 9
Fill Material: High density foam and individual pocketed springs
Weight Limit: 1000 Pounds
Special Feature: Breathable, Pressure Relief, Individual Pocketed Coil System
Color: Black, Dark Gray
Product Dimensions: 79.92 x 75.98 x 12 inches
Item Weight: 72.8 pounds
Manufacturer: AWT Store
Item model number: 5ecb53ad-af58-4da4-aa8d-863b12702f71
Date First Available: July 19, 2024
Age Range Description: Suitable for all ages
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
This is one comfy mattress. I went from a memory foam to this hybrid. It is good quality, too. One thing is that it hangs over my queen size foundation, so the sides dont seem as supportive if its off a little. But other than that, its wonderful.
Reviewed in the United States on October 21, 2025 by GBarr
Size: King
Style: 12 Inch Medium
i was apprehensive when i read hybrid mattress which means it has springs, but trust me when i tell you this mattress feels amazing. My back doesn't feel as sore anymore. My kitty and I have been having a super pleasant sleep since the purchase. The package is heavy and won't fit in a regular car if you would have to move it. It was a bit difficult to unpack but then again i was doing it by myself.
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Reviewed in the United States on October 22, 2025 by Amazon Customer
Size: King
Style: 12 Inch Medium
I was very surprised how easy it was to remove from shipping packaging and sealed packaging. It opened very quickly; i wasn't quite ready for that. This mattress is a replacement for RV primary bed. It's a tad bigger than the RV mattress, but it's not a big deal. Just making the bed is a little more difficult, but no biggie. No yucky smell and let settle for 24H before it was to full expansion. Slept great and was so comfortable. Great value for the money!
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Reviewed in the United States on August 19, 2025 by M. Krar
Size: Queen
Style: 14 Inch
The bed is very comfortable I just wish the edges were a little more firm. But other than that love it!
Reviewed in the United States on February 14, 2025 by Dee Hale
Got this about 6 months ago. It is soft but also supportive. I was hesitant about a bed in a box, but honestly I spent a lot on my mattress from a mate store and I’m pretty underwhelmed considering the price we paid. This mattress was a great price. In fact my sister has slept on this bed twice now and is usually up several times a night and both times she slept through the whole night. She has since purchased her own.
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Reviewed in the United States on August 13, 2025 by Alison
Size: King
Style: 12 Inch Medium
I wish I could give a negative review. This bed is SO uncomfortable. You can feel the springs. I compared the specs with the bed I had. They were the same but this new bed is so much more uncomfortable than my old mattress. Total let down.
Reviewed in the United States on October 14, 2025 by Candy Hart
Size: Queen
Style: 14 Inch
I love this bed! It's extremely comfortable! I was amazed at how tight packed it came during shipping and then it just fluffed up with no problem! It looks just like the picture and offers great support! This is exactly the bed we needed! Comfort, support and functionality all check out! Highly suggest!
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Reviewed in the United States on September 7, 2025 by Amazon Customer
Size: King
Style: 12 Inch Medium
I was a little nervous ordering a mattress online, but the SIMARTH 12-Inch King Size Mattress exceeded all my expectations. From the moment I opened the box, I could tell it was high quality. It expanded fully within a few hours and didn’t have a strong chemical smell like some memory foam mattresses do. If you’re looking for a mattress that offers great support, comfort, and quality materials without spending a fortune, this is a fantastic choice. I’m sleeping better and waking up more refreshed.
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Reviewed in the United States on August 7, 2025 by Julmice jean mauline