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Firm
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On Sale
Mancini's Sleepworld Onyx Firm Mattress 13"-Eastern King
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In Stock
Mancini's Sleepworld Onyx Firm Mattress 13"
Why this Mattress?
- Built for back sleepers who need firm, lasting spinal support
- Cooling cover pulls heat away so you stop sleeping hot
- Gel memory foam layer cushions without going soft
- 840 pocketed coils move independently to reduce motion transfer
- Dense upholstery-grade base foam holds its shape year after year
Overview
Mancini's Sleepworld Onyx Firm Mattress 13" Eastern King
The Mancini's Sleepworld Onyx Firm Mattress 13" is a firm mattress built for back sleepers and combination sleepers who need reliable spinal alignment without waking up stiff. At 13 inches tall, it delivers a firm mattress for back pain relief that holds up night after night without breaking down early. The coil support system is wrapped in fabric to isolate motion, so a restless partner stays on their side of the bed. Stop by any Mancini's Sleepworld location and a sleep specialist will walk you through this mattress side by side with every comparable option so you can feel the difference firsthand.
COMFORT AND FEEL: Firm feel with a gel-cooled surface and deep pocketed coil support that keeps the spine lifted.
SIZE: This Eastern King sized mattress is built for couples who want room to move and still wake up without lower back tension.
BEST SLEEP MATCH: Back sleepers and some side sleepers do best on this firm mattress for back sleepers. The firm support keeps the hips from sinking and holds the lumbar in a neutral position all night.
BEST FOR: Ideal for sleepers who run warm at night, need consistent lumbar support, or have woken up stiff on a softer mattress for too long.
CONSTRUCTION SPECIFICATIONS: The heavyweight stretch knit cover is built to sleep cool and resist heat buildup through the night. Beneath it, a gel-infused memory foam layer absorbs pressure without going soft. An 840 pocketed coil system moves independently for motion separation and targeted lift. High-density upholstery-grade support layers underneath resist body impressions. 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 required for setup.
NOT A FIT FOR: Side sleepers who need cushioning at the shoulder and hip, or anyone who prefers a plush or pillow-top feel.
YOUR SLEEP, BACKED BY US
Every mattress purchase at Mancini's Sleepworld comes with a 120-night comfort guarantee and our Best Price Guarantee, so you buy with complete confidence. Add a premium mattress protector at the time of purchase and you can choose to extend that guarantee to a full 365 nights. Come try this mattress in person at any of our locations, enjoy free next-day delivery, in-home professional setup, and flexible financing options that make it easy to say yes.
- 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-E6M-FM-25
- MPN: 25WICRAFF_FP66
- GTIN: 810146419204
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: 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 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