Specialty Firm The Rock

The Rock Tight Top Mattress
The Rock Tight Top Mattress
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The Rock Tight Top Mattress
Our foam-encased verti-coil support system is Tri-Zoned and provides firm support
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  • THE SPINAL COMFORT ROCK BEDS

    Our customers asked for firm, and we listened. The Rock is our firmest mattress at a great value. Our  foam-encased verti-coil support system is Tri-Zoned and provides firm support. If you are looking for our firmest premium mattress with our individually-wrapped coils, check out the Dream Collection Regal, but if you want extra firm, you've found the right place.
     

    Firmness & Height

    ModelFirmness (learn more)Height
    The Rock Extra Firm (10) 13"
    The Stone Firm (9) 13"
     

    Conformability

    High
     

    Mattress Features & Benefits

    • The Verti-Coil support system is firm and supportive for lasting comfort.
    • High coil coil that is specially designed to maintain support where you need it the most.
    • The foam-encased design provides a supportive, firmer edge that allows you to sleep all the way to the edge of the bed without feeling like you will roll off. It increases the sleeping surface and reduces vibrations. Also, all of our foam-encased beds feature Tri-Zoned Lumbar Support to give you additional support in your lumbar region, where you need it most.
    • Maintains a cool, balanced temperature throughout the night, allowing muscles to breathe and heal
    • Minimizes pressure points to reduce pain and tossing and turning by combining layers of our Eco-Flex plant-based cushioning foam over our spring system
    • Always returns to its original shape to support you night after night
    • We process all the materials right here at Diamond, so we know they are the best and we can offer a 20 year warranty that we have stood behind for 4 generations*

    Adjustable Friendliness (learn more)

    No
     
    *Note: Although our mattresses have been tested and will last 20 years, we recommend changing every 8 to 10 years. As your body changes, your mattress needs will change over time.
    Made in the USA 
    20 Year Warranty 

    Free Information Kit

    Sleep Better
  • Collection

    Spinal Comfort Collection
     

    Benefits

    The Rock is our firmest mattress at a great value. Our  foam-encased verti-coil support system is Tri-Zoned and provides firm support. If you are looking for our firmest premium mattress with our individually-wrapped coils, check out the Dream Collection Regal, but if you want extra firm, you've found the right place.
     
     
    Conformability
     
    Medium Low 

    Available Sizes

    Twin (38" x 74")
    Twin Long (38" x 80")
    Full/Double (53" x 74")
    Queen (60" x 80")
    California King (72" x 84")
    Eastern King (76" x 80")
     

    Firmness & Height

    ModelFirmness (learn more)Height
    The Rock Extra Firm (10) 13"
    The Stone Firm (9) 13"
     

    Comfort Layer

    Firm Plant Based Eco-Flex Foam
    Layers of High Density Eco-Flex Plant-Based Foam 
     

    Support Layer

    Tri-Zoned, Foam Encased Design for Enhanced Back Support
    Verti-Coil® Spring System, which has 21% more coils than the traditional spring unit while helping to relieve pressure.

    Base Layer

    Orthopedic Eco-Flex Plant-Based Base Layer
     

    Edge Support

    Foam Encased Edge Support System with Tri-Zoned Lumbar Support
     

    Cover Fabric

    Soft 4-Way Stretch Knit Cover
     

    Removable/Washable

    No
     

    Allergen and Dust Mite Resistant

    Yes
     

    Non-Skid Bottom

    Yes
     

    Foundation

    Matching Sustainable Hard Wood Foundation
     

    Adjustable Friendly

    No, see our adjustable bases to learn more
     

    Warranty

    20 Year Limited Warranty

Other Products You May Like:

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Regal
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Posture Balance Sierra Mattress
Sierra
Our best value firm mattress, the Sierra has great edge support and high density plant-based foams that will remain comfortable and firm for years.
Dream Apollo Mattress
Apollo
Softer and more conforming than the Regal, this mattress is perfect for someone who wants a firm but comfortable mattress.
 
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