
Mancini's Sleepworld Onyx Medium Mattress 13"
The Mancini's Sleepworld Onyx Medium Mattress 13" is an innerspring mattress built for the sleeper who runs warm and wakes up stiff. It layers cooling foam comfort over a fabric-wrapped pocketed coil system that moves with your body rather than pushing back against it: enough give to take pressure off hips and shoulders, enough push-back to keep your spine where it belongs.
Why this Mattress?
- Cooling gel memory foam keeps you sleeping at ease
- Pocketed coil support system reduces motion transfer
- High-density comfort layers cushion pressure points
- Stretch knit cover draws heat away from the body
- CertiPUR-US certified foams safe for your home
Comfort and feel: Medium feel with a cushioned surface and coil-driven support that keeps the spine lifted.
Best sleep match: Back and side sleepers. Shoulders sink just enough while the pocketed coils hold the lumbar in place.
Best for: Sleepers who tend to overheat, wake up with pressure point soreness, or need a dependable innerspring that holds its shape.
Construction: Stretch knit cover over a gel-infused foam layer, two comfort foam layers, an 840-count pocketed coil system and a shock-absorbing base foam.
Setup and compatibility: Delivered flat. Compatible with adjustable bases, platform frames and box springs.
Not a fit for: Sleepers who prefer a plush or pillow-top feel, or a deep pressure-cradling sensation.
Specifications
- Type: Innerspring
- Firmness: Medium
- Height: 13"
- Cover: Polyester Knit
- Quilting: 2" H.D. Super Soft Quilt Foam, 3/4" H.D. Gel Infused Memory Foam
- Comfort: 1" Med-Firm H.D. Foam, 1.5" Extra Firm H.D. Support Foam
- Support: 8" 840 Pocketed Coil, 1" Shock Absorbing H.D. Base Foam
- Adjustable base compatible: Yes
- Motion separation: Yes
- Edge support: Yes
- Warranty: 10 Year
Product Breakdown
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Product Specifications
Brand: Mancini's Sleepworld
Adjustable Base Friendly:
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Warranty Information
Couldn't load pickup availability
Pickup available at Christian's Mattress Xpress - Distribution Center
Usually ready in 2-4 daysPairs well with

Mancini's Sleepworld Onyx Medium Mattress 13"
Common Product Questions
Is this mattress good for back pain?
Yes, this new mattress is a great option for supporting your back. Our mattresses are curated to give you the most options in different prices, at a great value.
Can you take my old mattress?
Yes. Christian’s Mattress Xpress provides quick, professional local delivery. Our team can also remove your old mattress to make upgrading easy and convenient.
How fast can I get it delivered locally?
Thanks to our Large inventory of in-stock mattresses, we can usually deliver in a few days or even same day. See store for details
