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Firm
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On Sale
Mancini's Sleepworld Onyx Firm Mattress 13"-Full
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In Stock
Mancini's Sleepworld Onyx Firm Mattress 13"
Why this Mattress?
- Built for back pain relief on a firm mattress, you sleep on top instead of sinking in
- Gel-infused memory foam keeps surface temperature neutral all night
- Pocketed coil system absorbs motion without transferring it across the bed
- Heavy-weight cold knit cover actively pulls heat away from the body
- CertiPUR-US certified foams, safe for the whole household
Overview
Mancini's Sleepworld Onyx Firm Mattress 13" · Full
The Mancini's Sleepworld Onyx Firm Mattress 13" is an innerspring mattress built for back and stomach sleepers who need a firm, reliable surface that holds its shape night after night. At 13 inches tall, it layers gel-infused comfort foam over a fabric-wrapped pocketed coil system, giving you the kind of lift under the lumbar that keeps you from waking up stiff. The dense upholstery-grade support layers beneath the coils are there specifically so this mattress doesn't go soft on you after the first year or two. If you've been sleeping on something that no longer pushes back, the Onyx Firm is a meaningful step in the right direction. Stop by any Mancini's Sleepworld location and our sleep specialists will put this next to every option in the same firmness range so you can feel the difference for yourself.
COMFORT AND FEEL: Firm and flat with a cool knit surface that sleeps noticeably temperature-neutral.
SIZE: This full sized mattress is 54 inches wide by 75 inches long, a versatile fit for single adults, teenagers, or a dedicated guest room.
BEST SLEEP MATCH: Back and stomach sleepers will feel most at home here. The firm mattress for back sleepers keeps hips lifted and the spine in a straight line, so you stop rolling toward the middle of the night with tension in your lower back.
BEST FOR: Ideal for sleepers who need firm lumbar support, run warm through the night, or want a mattress that holds its shape over years of use.
CONSTRUCTION SPECIFICATIONS: The cold-touch knit cover pulls warmth away from the body on contact. Gel-infused memory foam beneath it gives you pressure diffusion without the sinking sensation. Med-firm and extra-firm high-density comfort layers translate that into spinal support you can actually feel. An 840 pocketed coil core anchors everything, and a shock-absorbing base foam keeps the structure stable under repeated use.
SETUP AND COMPATIBILITY: This innerspring mattress is compatible with an adjustable base, platform frame, or box spring and arrives flat. Professional in-home setup is available through Mancini's Sleepworld with free next-day delivery included.
NOT A FIT FOR: Not the right choice for dedicated side sleepers who need deep hip and shoulder cushioning, or anyone who prefers a plush or pillow-top feel.
YOUR SLEEP, BACKED BY US
Every mattress purchase at Mancini's Sleepworld is backed by our Rest Easy Promise, which includes a 120-night comfort guarantee and our Best Price Guarantee. Add a premium mattress protector at the time of purchase and you can upgrade that to a full 365 nights, giving you an entire year to be certain. Flexible financing is available, and free next-day delivery with professional in-home setup means the hardest part is just picking the right bed. Come try it in any of our stores before you buy.
- 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-4M-FM-25
- MPN: 25WICRAFF_FP46
- GTIN: 810146419167
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Firm
- Height: 13
- Length: 75
- Width: 54
- Shipping Height: 13
- Shipping Width: 75
- Shipping Length: 54
- 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