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Firm
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On Sale
Mancini's Sleepworld Onyx Firm Mattress 13"-Cal King
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In Stock
Mancini's Sleepworld Onyx Firm Mattress 13"
Why this Mattress?
- Cooling stretch knit cover pulls heat off the surface fast
- Gel memory foam layer eases warmth away all night
- Pocketed coils move with you and minimize partner disturbance
- High-density upholstery foam layers hold their shape for years
- CertiPUR-US certified foams safe for your home environment
Overview
Mancini's Sleepworld Onyx Firm Mattress 13" | Cal King
The Mancini's Sleepworld Onyx Firm Mattress 13" is a hybrid innerspring mattress built for back sleepers who want a firm, supportive surface that holds the lumbar in place from the first hour to the last. The quilted stretch knit cover does real work at the sleep surface, managing temperature before it wakes you. Below that, a gel-infused memory foam layer adds a thin layer of pressure absorption without ever letting the feel drift toward plush. Fabric-wrapped pocketed coils handle the structural load while keeping motion from crossing the mattress. High-density upholstery-grade foam layers anchor the base so this mattress stays firm for the long term. If you want to feel it alongside other options before you decide, any Mancini's Sleepworld sleep specialist will set it right next to its competitors so you can feel the difference yourself.
COMFORT AND FEEL: Firm feel with a cool quilted surface and stable, lift-focused support underneath.
SIZE: This Cal King sized mattress is built for taller couples or single sleepers who want generous stretch-out room without sacrificing firm back support.
BEST SLEEP MATCH: Best for back sleepers who need a firm mattress for back pain relief. The pocketed coil system holds the lumbar steady throughout the night so you stop waking up stiff.
BEST FOR: Ideal for sleepers who need consistent lumbar support, run warm through the night, or wake up stiff from a mattress that lets the hips sink too far.
CONSTRUCTION SPECIFICATIONS: The quilted stretch knit cover draws heat away from the sleep surface immediately. A gel-infused memory foam quilting layer softens the firm feel just enough. Fabric-wrapped pocketed coils isolate motion across the mattress. High-density upholstery-grade support foam keeps this mattress from softening out after the first year. Foams are CertiPUR-US certified.
SETUP AND COMPATIBILITY: Delivered flat with in-home professional setup available. Compatible with adjustable bases, platform frames, and box springs. No tools needed for your setup.
NOT A FIT FOR: Side sleepers who need deep shoulder and hip contouring will find this feel too firm. Sleepers who prefer a plush or pillow-top surface should look at softer options in the Onyx line.
YOUR SLEEP, BACKED BY US
At Mancini's Sleepworld, every mattress comes with a 120-night comfort guarantee and a Best Price Guarantee, so you buy with confidence. Add a premium mattress protector at the time of purchase and you can upgrade your guarantee to a full 365 nights. Come try this mattress in person at any Mancini's Sleepworld location, enjoy free next-day delivery, flexible financing, and in-home professional setup so your first night is effortless.
- SleepMatch: blue
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-ONY-6M-FM-25
- MPN: 25WICRAFF_FP67
- GTIN: 810146419235
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Firm
- Height: 13
- Length: 84
- Width: 72
- Shipping Height: 13
- Shipping Width: 84
- Shipping Length: 72
- Warranty: 10 Year
- Cover Material: Polyester Knit
- Quilting Layers: 3/4 H.D Gel Infused M - Foam, 3/4 Extra Firm Quilt Poly
- Comfort Layers: 1'' Med-Firm H.D. Foam,1.5'' Extra Firm H.D. Support Foam
- Support System: 8'' 840 Pocketed coil ,1.0'' 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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Cooling Technology: Yes
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Edge Support: Yes