Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12" Firm Hybrid Cooling Mattress by Diamond

Brand: Diamond
$1,299.00
$1,999.00
Save $700.00
Snap Logo Lease for as low as $/week Learn More

Best For

Side & Stomach Sleepers

Firmness

Firm Comfort
Only 12 left in stock
OUT OF STOCK
Restock soon! PREORDER NOW
HURRY! LET BUY NOW

Only 12 left in stock

Will Ship between

120 Night Sleep Trial

Take your dream bed home & rest easy—love it or your money back, plus we’ll find you a better fit.
Title

20 Year Warranty

20-year non-prorated warranty.
Title

Free USA Wide Delivery

We offer free delivery on orders over $100. Ready to ship in 2-4 business days.

Product Description
  • Cool Touch Temperature Regulating Fabric
  • Cool Copper Memory Foam
  • Certipur HD Comfort Layers
  • Diamond-made Wrapped Coils
  • 20-Year Warranty

  • Performance Cooling Fabric

  • Copper Foam - Cooling and contains natural anti-microbial properties

  • Gel memory foam 

  • CertiPUR-US Certified High-Density foam (higher density than the industry standard)

  • For Foam: Orthopedic Foam Core For Hybrid: Individually Wrapped Coils.

  • 120 Night Sleep Trial

Mattress Size

✅ Twin: Provides a comfortable sleep space for one child or adult.  

✅ Dimensions: 39" wide x 75" long.

 

✅ Twin XL: Perfect for taller individuals, ensuring a comfortable sleep.

✅ Dimensions: 39" wide x 80" long.

 

✅ Full: Children, Single Adults, Adults with Children and/or Pets

✅ Dimensions: 54" wide x 75" long.

 

✅ Queen: The most popular size, providing ample space for two adults to sleep comfortably. 

✅ Dimensions: 60" wide x 80" long.

 

✅ King: Experience generous space without crowding your partner. 

✅ Dimensions: 76" wide x 80" long.

 

✅ California King: Perfect for taller partners, Experience generous space without crowding your partner.

✅ Dimensions: 72" wide x  84" long.

72-Hours Sale 15% off coupon
00
Days
00
Hours
00
Minutes
00
Seconds

Use this code during checkout
"LIQUIDATION15"

72-Hours Sale 10% off coupon
00
Days
00
Hours
00
Minutes
00
Seconds

Use this code during checkout
"LIQUIDATION15"
key mattress benefits
Performance Cooling Fabric

Temperature-regulating fabric ensures a consistently cool and comfortable sleep surface.
Cool Copper & Gel Memory Foam

Copper-infused foam provides cooling and antimicrobial benefits, while gel memory foam adds extra pressure relief.
CertiPUR-US Certified HD Foam

High-density comfort layers offer enhanced durability and orthopedic support for long-lasting comfort.
Diamond-Made Wrapped Coils

Individually wrapped coils provide personalized support and reduce motion transfer; backed by a 20-year warranty.
Firm Comfort

Ideal for those who prefer a firm feel with a hint of softness, these mattresses provide sturdy support with slight cushioning for comfort, offering a stable, supportive sleep experience.

not sure if this is the right mattress for you?

If you're unsure whether this is the perfect mattress for you, don't hesitate to reach out to our sleep experts for personalized recommendations. We're always happy to assist our customers in finding the ideal mattress that fits both their comfort needs and budget.

Talk To a Sleep Expert

more firm comfort mattresses
G4 Nova Luxury 12
G4 Nova Luxury 12" Memory Foam Mattress, Firm iDealBed

Brand: iDealBed

Starting from
$699.00
Shop Now
Rock 2.0 Express 12
Rock 2.0 Express 12" Tight Top Extra Firm Mattress by Diamond

Brand: Diamond

Starting from
$493.00
Shop Now
Sierra Sleep Limited Edition 12 Inch Firm Mattress by Ashley
Sierra Sleep Limited Edition 12 Inch Firm Mattress by Ashley

Brand: Ashley

Starting from
$349.00
Shop Now
Sierra Sleep Mt Dana Ltd 15 Inch Firm Mattress by Ashley
Sierra Sleep Mt Dana Ltd 15 Inch Firm Mattress by Ashley

Brand: Ashley

Starting from
$459.00
Shop Now

what our customers say?

Customer Reviews

Based on 16 reviews
100%
(16)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
I
Isabella S.
Best mattress

Best mattress I have ever slept on!

U
Uma W.
Excellent product

I loved it! Very soft and comfortable.

R
Robert F.
My wife wanted a new mattress and she has enjoyed it

The shipping and purchase of it was great and delivered and setup was painless.

Y
Yanet P.
Very comfortable and less morning pain

The mattress was delivered as promised and in a roll. I drive truck, so the flexibility of the mattress is great for getting it into the bunk space. It’s very comfortable to sit and sleep on. I’m very happy with this purchase.

T
Tracey M.
COMFY

I was kind of nervous about ordering a bed online because I’ve always went to a furniture store and tested the bed out before purchasing it.. BUT LET ME TELL YOU, this is the comfiest mattress I’ve ever slept on in my entire life, best sleep I’ve had in years!! Do yourself a favor and buy this bed😩

Load More
Sign-up to our newsletter and save 10% on your first purchase
Thanks for contacting us. We'll get back to you as soon as possible.

Address - 6075 Old Canton Rd, Jackson Ms 39211

Phone Number - 800-540-9851

Give us a Call

(Mon-Fri 10am - 5pm CT)

Copyright © 2025 Cloudy Mattress. All Rights Reserved.
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12
Rally 12

Rally 12" Firm Hybrid Cooling Mattress by Diamond

$1,299.00