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Firm
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On Sale
Overview
- SleepMatch: blue
Mancini's Sleepworld Onyx Firm Mattress 13"
- Firm mattress for back pain relief keeps spine aligned nightly
- Gel memory foam quilting pulls heat away as you sleep
- Pocketed coil system moves with you, not against you
- High-density support layers resist softening over time
- CertiPUR-US certified foams, safe for your home
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In Stock
Overview
Mancini's Sleepworld Onyx Firm Mattress 13" · Twin
The Mancini's Sleepworld Onyx Firm Mattress 13" is a hybrid innerspring mattress built for back sleepers and stomach sleepers who need a firm mattress for back pain relief without sacrificing overnight temperature comfort. At 13 inches tall, it layers real structure with active cooling so the sleeper who wakes up stiff and sweaty finally has one answer to both problems. The construction is deliberate and the support is built to last, not just to impress on the first night. 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: Firm and flat with a cool-to-touch surface and steady lumbar lift throughout the night.
SIZE: This Twin sized mattress is ideal for a solo sleeper, a growing teen, or a dedicated single-sleeper guest room.
BEST SLEEP MATCH: Back sleepers and stomach sleepers will feel most at home here. The firm surface for back sleepers keeps hips from dropping and stops that familiar morning ache before it starts.
BEST FOR: Ideal for sleepers who run warm at night, wake up with lower back stiffness, or need a coil-based mattress that holds its shape year after year.
CONSTRUCTION SPECIFICATIONS: The heavyweight stretch knit cover is engineered to sleep cool from the first night. Gel-infused memory foam in the quilt layer pulls heat away from the body. A med-firm high-density comfort layer transitions smoothly into the extra-firm support foam beneath it. An 840 pocketed coil system provides deep, responsive lift. A shock-absorbing high-density base keeps the whole stack stable.
SETUP AND COMPATIBILITY: Delivered flat with in-home professional setup included. Compatible with adjustable bases, platform frames, and traditional box springs. No tools required for assembly.
NOT A FIT FOR: Side sleepers who need hip and shoulder cushioning may find the firm surface creates pressure. Combination sleepers who prefer a softer, cradling feel should explore the Onyx Medium.
YOUR SLEEP, BACKED BY US
Every mattress purchase at Mancini's Sleepworld includes a 120-night comfort guarantee backed by the Rest Easy Promise, plus our Best Price Guarantee. Come try this mattress in person at any of our locations before you buy. Free next-day delivery and in-home professional setup are included. Add a premium mattress protector at purchase and your guarantee extends to a full 365 nights. Flexible financing options are available to fit your budget.
Features
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Suitable For Adjustable Base
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Motion Separation
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Cooling Technology
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Edge Support
- SleepMatch: blue
Mancini's Sleepworld Onyx Firm Mattress 13"
Features
- SKU: BRK-ONY-3M-FM-25
- MPN: 25WICRAFF_FP33
- GTIN: 810146419143
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Firm
- Height: 13
- Length: 75
- Width: 3
- Shipping Height: 13
- Shipping Width: 75
- Shipping Length: 38
- 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