The Diamond Rock Extra Firm Mattress delivers maximum support with minimal give. Built with high-density comfort layers and a durable support core, this extra firm mattress promotes healthy spinal alignment and resists sagging — making it ideal for back and stomach sleepers or anyone with lower back pain. With cooling technology and low motion transfer, it’s also a great solution for couples who prefer a firm feel without disturbance.
Best For
Back and stomach sleepers, sleepers with back pain, and anyone seeking an orthopedic extra firm mattress for maximum support. Also great for heavier body types and those who prefer a stable, no-sink surface.
Key Features
- Extra Firm Comfort Level: One of the firmest feels available — provides ultra-dense support for spinal alignment.
- High-Density Support Foam: Creates a solid, non-conforming feel to reduce motion and enhance back support.
- CoolTouch Gel Memory Foam: Wicks away heat while keeping the surface temperature-neutral and breathable.
- Durable Base Layer: Reinforces long-term structure, great for heavier body types or extended use.
- Low Motion Transfer: Ideal for couples — movement stays isolated to one side of the bed.
- Hypoallergenic & Eco-Friendly: CertiPUR-US® certified foams with no harmful chemicals or flame retardants.
- Adjustable Base Compatible: Works perfectly with all adjustable power foundations from LA Mattress Store.
- 20-Year Limited Warranty: Handcrafted in California by Diamond Mattress with premium materials built to last.
Why Choose the Rock Extra Firm Mattress?
If you need a mattress that won’t sink, shift, or compromise on support, the Rock Extra Firm Mattress delivers. Whether you're recovering from back issues or just love an ultra-firm feel, this mattress provides orthopedic support and long-lasting performance in a no-fluff design — all backed by Diamond Mattress’s legacy of comfort and craftsmanship.