Mronae 12 in King Size Black Cooling Gel Memory and Spring Hybrid Mattress for Adults
Mronae 12" King Mattress,Black Cooling Gel Memory & Spring Hybrid Medium Comfort King Size Mattress in a Box,Audlt,CertiPUR-US
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Mronae

Mronae 12" King Mattress,Black Cooling Gel Memory & Spring Hybrid Medium Comfort King Size Mattress in a Box,Audlt,CertiPUR-US

3,374 ratings
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Bed SizeKing
Actual ColorCool Black
Mattress Thickness12 in

Key item features

  • Healthier Sleep: Multiple layers of premium memory foam and individually wrapped pocket coils provide perfect body alignment and noise-free technology for uninterrupted sleep, preventing motion transfer.
  • Medium Comfort: This 12-inch king hybrid mattress features a 6-layer construction including cooling fabric, fireproof foam, gel memory foam, high-density support foam, and individually wrapped pocket springs for medium-soft comfort and strong lumbar support.
  • Cooling Breathable: Advanced 3D airflow fabric with enhanced edge ventilation promotes maximum air circulation to regulate body temperature, ideal for hot sleepers and warm climates.
  • Effortless Setup: Delivered compressed in a box (9.8" W x 78.7" L x 10.2" H), it expands to its 12-inch height within 48-72 hours after unboxing and unrolling.
  • Certified Foams: All foams used in the mattress are CertiPUR-US certified for safety and durability, ensuring a reliable and eco-friendly product.
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Specs

Bed size, KingMattress comfort level, MediumMattress type, Hybrid MattressesMattress thickness, 12 inBrand, MronaeMaterial, Hybrid Springs

About this item

Product details

Experience Revolutionary Comfort with Mronae Hybrid King Mattress Discover the ultimate sleep solution engineered for adults seeking premium support and temperature control. Our 12-inch hybrid masterpiece combines cutting-edge pocket coil technology with advanced cooling materials, delivering unparalleled comfort for your bed. Whether you need a queen mattress for compact spaces or a luxurious king size mattress for master bedrooms, each layer is precision-crafted for restorative sleep. Engineered Support System At the heart of this mattress lies a 6-layer defense against discomfort: 3D Airflow Cover: Breathe easy with moisture-wicking fabric Gel Memory Foam Layer: Cradles pressure points while dissipating heat High-Density Support Foam: Reinforces spinal alignment Individually Wrapped Pocket Coils: Targeted responsiveness with zero motion transfer Edge Reinforcement System: Prevents sagging across all queen size mattresses Climate-Controlled Sleep Sanctuary Our edge ventilation channels and open-cell memory foam mattress construction actively exhaust heat buildup. Experience up to 8°F cooler sleep than traditional hybrids - the definitive answer for night sweats. Perfectly pairs with full size bed or queen bed setups in warm climates. Effortless Setup & Sizing Your 12-inch King mattress in a box arrives compressed for hassle-free delivery: Twin size mattresses: 39"W x 75"L Full size mattress: 54" W x 75" L Queen size mattress: 60" W x 80" L King size mattress: 76"W x 80"L Unbox and unroll for instant expansion (full loft in 48-72 hours). Our mattress queen size models fit standard frames perfectly Unshakeable Quality Assurance Every layer features CertiPUR-US certified foams - verified safe, durable, and eco-friendly. Backed by our industry-leading: Upgrade your king bed or mattress king size with absolute confidence. Why Settle For Ordinary Sleep? Join 250,000+ satisfied sleepers who chose Mronae's king mattress firm support and cooling innovation. Click [Add to Cart] to transform your mattress queen experience today!
  • Experience Healthier Sleep: The Mronae king hybrid mattress's multiple layers of premium memory foam and individually wrapped pocket coils deliver perfect boby alignment. Say Goodbye to sleepless nights—when your partner moves, you won't feel a thing. Plus, our noise-free technology guarantees peaceful, uninterrupted sleep all night long.
  • 12Inch King Mattress Medium Firm Feel: This 12" king hybrid mattress features a 6-layer premium construction (cooling fabric, fireproof foam, gel memory foam, high-density support foam, and individually wrapped pocket springs) for medium-soft comfort that relieves pressure—perfect for side sleepers (no shoulder pressure) with strong lumbar support, adapting to all sleeping positions.
  • Cooling & Breathable Sleep Surface: Advanced 3D airflow fabric with enhanced edge ventilation promotes maximum air circulation to regulate body temperature all night. Stay comfortably cool—ideal for hot sleepers and warm climates—while preventing heat buildup for undisturbed rest.
  • 12Inch King Mattress in a Box: Delivered compressed for easy handling (Dimensions: 9.8" W x 78.7" L x 10.2" H). Simply unbox, unroll, and watch it expand - no setup required! For optimal comfort, allow 48-72 hours for full expansion to its plush 12-inch height.
  • CertiPUR-US Certified & Risk-Free Purchase:All foams are CertiPUR-US certified for safety and durability. Invest in confidence—if you're not satisfied, we'll make it right!
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Specifications

Bed size

King

Mattress comfort level

Medium

Mattress type

Hybrid Mattresses

Mattress thickness

12 in

Warranty

Warranty information

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Customer ratings & reviews

4.4 out of 5 stars
stars
3,374 ratings599 reviews
Includes global ratings and reviews
How item rating is calculated
  1. 5 stars72% (2,444)
  2. 4 stars10% (345)
  3. 3 stars5% (164)
  4. 2 stars3% (107)
  5. 1 star9% (314)

Reviews summary

Pros

  • : Mattress provides balanced support and pressure relief.
  • : Offers quality at a reasonable cost.
  • : Has a high-end visual appeal.
  • : The mattress reduces tossing and morning soreness.
  • : It provides balanced support with moderate give.

Neutral

  • : It aligns spine with medium-firm feel but lacks edge support.
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Showing 1-3 of 599 reviews

Aug 3, 2026
Reviewer name: Karletta
Item details
Bed size: King
Color: Cool Black
Mattress thickness: 14 in
Sold byAuraSleepDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

So far so good.

I'm very happy with this mattress so far. It arrived compressed, but once I removed the plastic it expanded to its full size immediately. The mattress has a true medium-firm feel. Supportive without feeling too hard. I also love that the edges stay sturdy and don't sink when sitting or lying near the sides. The overall quality feels great, and the setup was quick and easy. Looking forward to seeing how it holds up over time!

Helpful?2SO16DYH8U1017324350186
Oct 11, 2026
Reviewer name: Crystal
Top Reviewer
Item details
Bed size: Twin
Color: Cool Black
Mattress thickness: 12 in
Sold byAuraSleepDelivered byWalmart
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Dark Gray in color -beautiful

Love the dark color. Comfy beyond words. So happy with this purchase.

Helpful?2SO16DYH8U1017324350186
Jun 5, 2026
Reviewer name: Johnny
Item details
Bed size: Full
Color: Cool Black
Mattress thickness: 12 in
Sold and shipped byAuraSleep
5 out of 5 stars
5 out of 5 stars review

Verified Purchase

Great Mattress for Side Sleepers!

I wasn't sure what to expect from a mattress-in-a-box, but the Mronae 12" Full Hybrid has been a great experience so far. The medium-comfort feel is spot on; not too soft, not too firm. As a side sleeper, the additional top cushioning made a noticeable difference in relieving pressure on my shoulders and hips. Corners could have been a bit firmer, but didn't bother me as much. The cooling gel layer makes a difference — even on warmer nights, I don't overheat like I used to. Setup couldn't be easier: just unbox, unroll, and it fully expanded within a couple of days. Highly recommend for anyone looking for quality sleep without breaking the bank!

Helpful?2SO16DYH8U1017324350186
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