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Extra Firm
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On Sale
Mancini's Sleepworld Diamond Extra Firm Mattress 11"-Cal King
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In Stock
Mancini's Sleepworld Diamond Extra Firm Mattress 11"
Why this Mattress?
- Built for the sleeper who needs the floor beneath them to do the heavy lifting
- Fabric-wrapped coil system with super heavy-gauge wire
- Super high-density upholstery-grade support layers resist long-term softening
- Motion separation lets one sleeper shift without waking the other
- Stretch-knit quilt panel moves with the body without trapping heat
Overview
Mancini's Sleepworld Diamond Extra Firm Mattress 11" · Cal King
The Mancini's Sleepworld Diamond Extra Firm Mattress 11" is a hybrid innerspring mattress built for back and stomach sleepers who need an extra firm mattress for back pain relief and won't settle for a surface that gives too much. The fabric-wrapped pocketed coil system sits at the core, flanked by high-density upholstery-grade foam layers that keep the spine lifted and properly aligned from the first night onward. The heavyweight 4-way stretch knit cover flexes with every movement without bunching.
The support here is unapologetic. This mattress is engineered to hold its position night after night, and the dense base construction means it won't begin to soften three years in. If you want to feel it in person before committing, stop by any Mancini's Sleepworld location and our sleep specialists will put this right next to the competition so you can feel the difference yourself.
COMFORT AND FEEL: Extra firm with a flat, unyielding surface that keeps the spine neutral all night.
SIZE: This Cal King sized mattress is 72" x 84", giving taller sleepers or couples who need personal space room to stretch out fully.
BEST SLEEP MATCH: Back and stomach sleepers who need extra firm support will feel this mattress doing exactly what it should. The firm for back sleepers feel keeps the hips from sinking and the lumbar from rounding under load.
BEST FOR: Ideal for sleepers who need maximum spinal support, tend to sleep on their back or stomach, or wake up stiff from a surface that sinks too much.
CONSTRUCTION SPECIFICATIONS: The pocketed coil system uses super heavy-gauge wire and fabric wrapping to deliver motion separation and targeted pushback. A 1.5" high-density upholstery-grade comfort layer sits above the coils for structured surface feel. The dense shock-absorbing base foam below keeps the whole system stable. Foams are CertiPUR-US certified.
SETUP AND COMPATIBILITY: Compatible with an adjustable base, platform frame, or standard box spring. Delivered flat with free local delivery; in-home professional setup is available.
NOT A FIT FOR: Side sleepers who need hip and shoulder pressure relief, or anyone who prefers even a moderate amount of surface cushion.
YOUR SLEEP, BACKED BY US
Every Mancini's Sleepworld mattress purchase includes a 120-night comfort guarantee backed by the Rest Easy Promise, plus free next-day delivery, in-home professional setup, flexible financing, and our Best Price Guarantee. Try it in any showroom before you buy. Add a premium mattress protector at time of purchase and you can choose to extend your guarantee to a full 365 nights, giving you an entire year to be certain.
- 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-6M-XF-25
- MPN: 25WICOTEF_FP67
- GTIN: 810146418825
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Extra Firm
- Height: 11
- Length: 84
- Width: 72
- Shipping Height: 11.5
- Shipping Width: 84
- Shipping Length: 72
- 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