Side view of the Black Diamond 15" All-Foam Mattress in a designer bedroom with contemporary lighting and decor. Front view of the Black Diamond 15" All-Foam Mattress centered in a luxury master bedroom with warm ambient light. Angled studio shot of the Black Diamond 15" All-Foam Mattress showcasing the modern quilted top and black sides. Front view profile of the Black Diamond 15" All-Foam Mattress highlighting the thick luxury build and black fabric. Black Diamond 15" All-Foam Mattress in plush bedroom setting shown on a modern white platform bed frame view. Black Diamond 15" All-Foam Mattress internal layers showing advanced cooling technology and pressure relief foam. Close-up of the Black Diamond 15" All-Foam Mattress featuring the 20-year warranty and made in USA trust badges. Black Diamond 15" All-Foam Mattress comfort rating graphic ideal for side and back sleepers with a plush feel.
Black Diamond 15" All-Foam Mattress – Plush, Medium or Firm
Ultra Soft Soft Medium Soft Medium Medium Firm Firm Extra Firm

Black Diamond 15" All-Foam Mattress – Plush, Medium or Firm

$1,699.00
$2,499.00
Save $800.00
Brand: Diamond
Size
Comfort Level
i Size Guide
$1,699.00
Only 12 left in stock
Free Shipping In USA Free Shipping In USA
20 Year Warranty 20 Year Warranty
120 Night Sleep Trial 120 Night Sleep Trial

The Diamond Black Diamond All Foam Mattress delivers a cloud-like high-profile comfort thanks to its towering 15-inch build. 

Choose Plush, Medium, or Firm to 
dial in the feel that suits you best. Every option starts with a CoolTouch™ Ultra-Cool cover that wicks heat instantly. 

Next, layers of Cool Titanium and graphene-sparkle memory foam conform deeply for deep pressure-point relief, making this model a contender for the best 15-inch foam mattress for back pain. 

Beneath, a high-density support foam base creates a stable, motion-isolation foam technology core so couples enjoy zero motion transfer all night. 

Because of this multi-layer design, you’ll sleep on a temperature-regulating sleep surface proven to stay cool for 12+ hours. 

And that's not all. This mattress is built from CertiPUR-US certified foams and comes with a 20-year warranty, 120-night sleep trial, free shipping USA nationwide, and optional Affirm financing.

Targeted Pressure Relief

Titanium-infused memory foam melts tension in hips, shoulders, and lower back.

12 + Hour Cooling

Ice Flex bands plus cool cover pull heat away for lasting refreshment.

Zero Motion Transfer for Couples

All-foam core absorbs movement so partners never feel each other toss.

High-Density Support Base

Carries weight evenly for durable support and healthy alignment.

15-Inch High-Profile Design

Elevates you higher off the frame for a luxury-hotel stature and easy exit.

Key Mattress Benefits

Black Diamond 15" All-Foam Mattress – Plush, Medium or Firm

5 Layers
Of Cooling
Comfort

Advanced cooling fabric with integrated bands pulls heat away from the body to maintain a consistently cool sleep surface.

Plush quilted cushioning provides immediate softness and enhances overall comfort when you lie down.

Specialized memory foams contour deeply to relieve pressure while helping regulate temperature for a cooler and more supportive sleep experience.

Supportive transition foam promotes balanced contouring and ensures smooth weight distribution across the mattress.

A durable foam core stabilizes the mattress and provides long-lasting support with minimal motion transfer.

Black Diamond 15" All-Foam Mattress – Plush, Medium or Firm
CLOUDY MATTRESS IS THE SMARTER CHOICE
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CLOUDY MATTRESS IS THE SMARTER CHOICE

From better sleep support to trusted quality, Cloudy Mattress gives you more value for your money.

SHIPPING

FASTEST SHIPPING

Get your new mattress delivered quicker than ever with our priority nationwide shipping. No long waits, comfort arrives right at your door step, fast.

CUSTOMER SUPPORT

24 / 7 CUSTOMER SUPPORT

Whether its day or night, our dedicated team is always available to answer questions, resolve issues, and guide you through every step.

GUIDANCE

EXPERT GUIDANCE

Not sure which mattress suits you best? our sleep experts are here to help you choose the perfect option tailored to your comfort, health and lifestyle needs.

GUARANTEED

BEST PRICE GUARANTEED

Shop with confidence knowing you're getting the best value. If you find a better deal, we'll matach it, guaranteed.

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Designed for deep comfort and better rest, so you wake up refreshed and ready for the day

It comes in Plush (~4/10), Medium (~6/10), and Firm (~8/10) feels, letting you match personal preference.

The CoolTouch cover, Ice Flex cooling bands, and ventilated foams work together to draw body heat away, maintaining a comfortably cool climate for over 12 hours.

Generally, all-foam profiles like this flex well on modern adjustable bases. But check clearances and weight limits before pairing.

No specific foundation is mandated; any solid platform, slatted base (≤3" gaps), or adjustable bed will preserve warranty coverage.

Expect the mattress to reach full loft within 24-48 hours of unboxing. You can sleep on it the first night, though minor height gains will continue during that period.

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