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Extra Firm
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On Sale
Mancini's Sleepworld Onyx Extra Firm Mattress 13"-Eastern King
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In Stock
Mancini's Sleepworld Onyx Extra Firm Mattress 13"
Why this Mattress?
- Keeps your spine flat and properly lifted all night
- Gel memory foam pulls heat away while you sleep
- Fabric-wrapped coils absorb motion so partners sleep undisturbed
- Dense upholstery-grade base resists softening over time
- CertiPUR-US certified foams, safe for your home
Overview
Mancini's Sleepworld Onyx Extra Firm Mattress 13" Eastern King
The Mancini's Sleepworld Onyx Extra Firm Mattress 13" is an innerspring mattress built for back sleepers and stomach sleepers who need a firm mattress for back pain relief without compromise. The stretch knit cover is engineered to stay cool to the touch, and the gel-infused memory foam layer underneath manages heat rather than trapping it. Upholstery-grade high-density support layers hold their shape year after year, keeping the surface level and the lumbar properly aligned. Stop by any Mancini's Sleepworld location and a sleep specialist will place this next to every competing option at this firmness so you can feel the difference for yourself.
COMFORT AND FEEL: Extra firm with a flat, unyielding surface that holds the spine neutral without any sink.
SIZE: This Eastern King sized mattress is built for couples or solo sleepers who want maximum room to stretch out in a dedicated master bedroom.
BEST SLEEP MATCH: Built for back sleepers and stomach sleepers. The extra firm surface keeps hips from dropping and the lumbar from rounding, so you wake up without the stiffness that follows a night on something too soft.
BEST FOR: Ideal for sleepers who need strong lumbar support, tend to sleep hot, or share a bed and want to feel less of every movement.
CONSTRUCTION SPECIFICATIONS: The heavyweight stretch knit cover stays cool against your skin from the first night. A gel-infused memory foam quilting layer pulls warmth away before it builds. Firm support foam comfort layers keep the surface from compressing under pressure. A fabric-wrapped pocketed coil system handles motion separation. A shock-absorbing high-density base keeps the whole mattress stable for the long haul.
SETUP AND COMPATIBILITY: This mattress is compatible with an adjustable base, platform frame, or box spring. It is delivered flat, with in-home professional setup available.
NOT A FIT FOR: Side sleepers who need hip and shoulder cushioning, or anyone who prefers a soft or medium feel and wakes up stiff on firm surfaces.
YOUR SLEEP, BACKED BY US
At Mancini's Sleepworld, every mattress comes with a 120-night comfort guarantee and the Rest Easy Promise, so you can try it at home with real confidence. Add a premium mattress protector at time of purchase and you can upgrade to a full 365-night guarantee. You also get the Best Price Guarantee, free next-day delivery, flexible financing, and in-home professional setup. Come feel this one in any of our stores 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-ONY-E6M-XF-25
- MPN: 25WICRAFEF_FP66
- GTIN: 810146419105
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Extra Firm
- Height: 13
- Length: 80
- Width: 76
- Shipping Height: 13
- Shipping Width: 80
- Shipping Length: 76
- Warranty: 10 Year
- Cover Material: Polyester Knit
- Quilting Layers: 3/4 Extra Firm Quilt Poly,3/4 H.D Gel Infused M - Foam
- Comfort Layers: 1'' Firm Support H.D. Foam ,1.5'' Extra Firm H.D. Support Foam
- Support System: 720 13.5 Ga. 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