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Extra Firm
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On Sale
Mancini's Sleepworld Diamond Extra Firm Mattress 11"-Split Cal King
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In Stock
Mancini's Sleepworld Diamond Extra Firm Mattress 11"
Why this Mattress?
- Flat, lifted spine from your first night
- Fabric-wrapped coils cut motion across the bed
- Super heavy gauge wire holds firm for years
- 4-way stretch knit cover flexes without bunching
- CertiPUR-US certified foams, safe for everyday sleep
Overview
Mancini's Sleepworld Diamond Extra Firm Mattress 11" · Split Cal King
The Mancini's Sleepworld Diamond Extra Firm Mattress 11" is a hybrid mattress built for back sleepers and stomach sleepers who need true structural support, not just a firm feel. At 11 inches, it delivers a no-nonsense sleep surface that keeps your lumbar lifted through the night so you stop waking up twisted and stiff. The fabric-wrapped coil system is wound from super heavy gauge wire, which means this mattress holds its shape under consistent nightly pressure without softening out the way lighter-gauge systems tend to do. If you share a bed, the motion separation built into the coil layer means your partner's movement stays on their side. Our sleep specialists at Mancini's Sleepworld are glad to lay this next to every competing option in the store so you can feel exactly what extra firm means for your body.
COMFORT AND FEEL: Extra firm with a flat, unyielding surface that keeps the spine neutral and supported.
SIZE: This Split Cal King sized mattress is built for taller couples who want independent comfort on each side of the bed.
BEST SLEEP MATCH: Stomach sleepers and back sleepers who need a firm mattress for back pain relief will feel the difference here. The flat, non-contouring surface keeps hips from dropping and the lumbar from rounding overnight.
BEST FOR: Ideal for sleepers who need maximum spinal support, tend to sink through softer mattresses, or wake up with lower back and hip tension.
CONSTRUCTION SPECIFICATIONS: The 4-way stretch knit quilt panel moves with you without pulling. Firm support foam layers underneath the cover create a controlled, grounded feel. The fabric-wrapped coil system uses super heavy gauge wire for extra firm, consistent push-back. Super high density upholstery grade foam layers anchor the base, adding durability that holds up over years of use. Foams are CertiPUR-US certified.
SETUP AND COMPATIBILITY: Delivered flat with in-home professional setup included. Compatible with adjustable bases, platform frames, and standard box springs. No tools needed for setup.
NOT A FIT FOR: Side sleepers who need hip and shoulder cushioning, or anyone who prefers a contouring, pressure-cradling feel.
YOUR SLEEP, BACKED BY US
Every mattress at Mancini's Sleepworld comes with a 120-night comfort guarantee and our Rest Easy Promise, so you can sleep on it with real confidence. Add a premium mattress protector at the time of purchase and you can choose to extend that to a full 365 nights. We also back every purchase with our Best Price Guarantee, free next-day delivery, in-home professional setup, and flexible financing. Come try this one in any Mancini's Sleepworld location before you decide.
- SleepMatch: red
Rest Easy Promise
Our promise to you.
- 365-Night Comfort Guarantee with purchase of a premium mattress protector
- Best Price Guarantee Find it lower and we’ll match it.
- Free Next-Day Delivery We’ll deliver to your door, set-up available.
- Double-Your-Warranty We match the manufacturer’s warranty.
Features
- SKU: BRK-DIA-6SM-XF-25
- MPN: 25WICOTEF_FP36X84
- GTIN: 810146418757
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Extra Firm
- Height: 11
- Length: 80
- Width: 36
- Shipping Height: 11.5
- Shipping Width: 80
- Shipping Length: 38
- Warranty: 10 Year
- Cover Material: Polyester Knit
- Quilting Layers: 1 1/2'' Super Soft Quilt Foam
- Comfort Layers: 1 1/2'' Extra Firm Support H.D. Foam
- Support System: 720 13.5 Ga. Pocketed coil,0.75'' Shock Absorbing H.D. Base Foam
Specification
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Suitable For Adjustable Base: Yes
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Motion Separation: Yes
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Edge Support: Yes