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Medium
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On Sale
Mancini's Sleepworld Onyx Medium Mattress 13"-Split Cal King
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In Stock
Mancini's Sleepworld Onyx Medium Mattress 13"
Why this Mattress?
- Built to keep you cooler and supported through the night
- Gel memory foam pulls heat away as you settle in
- Fabric-wrapped pocketed coil system isolates motion between partners
- Dense comfort layers cushion hips and shoulders without bottoming out
- CertiPUR-US certified foams, safe for the whole household
Overview
Mancini's Sleepworld Onyx Medium Mattress 13" Split Cal King
The Mancini's Sleepworld Onyx Medium Mattress 13" is a hybrid mattress built for the sleeper who runs warm, shares the bed, and wakes up stiff more often than they should. The medium firmness sits right in the middle of the comfort spectrum, giving you enough give to feel genuine pressure relief at the hips and shoulders while the pocketed coil support system keeps the lumbar lifted through the night. If you have been searching for a medium mattress for back pain relief, the layered construction here does the work without asking you to sacrifice comfort.
Quilted with a heavyweight stretch-knit cooling panel, the surface pulls ambient warmth away the moment you lie down. Each side moves independently, and the fabric-wrapped coil system absorbs motion so a restless partner doesn't travel across to your side. Stop by any Mancini's Sleepworld location and our sleep specialists will place this right next to the competing options at the same price point so you can feel the difference on the spot.
COMFORT AND FEEL: Medium feel with a cushioned surface entry and a firm, stable base underneath.
SIZE: This Split Cal King sized mattress is two separate 36" x 84" panels, giving couples with different firmness preferences complete independent control.
BEST SLEEP MATCH: Best for side and combination sleepers on a medium hybrid mattress. The gel memory foam layer cradles the shoulder and hip while the coil base keeps the spine from drifting out of alignment.
BEST FOR: Ideal for sleepers who run hot, share the bed with a restless partner, or wake up with hip and shoulder soreness.
CONSTRUCTION SPECIFICATIONS: The stretch-knit cover quilts down into super soft comfort foam, then gel-infused memory foam that draws heat away from the body. Beneath that, medium-firm and extra-firm high-density comfort layers hold the shape and prevent the surface from softening unevenly over time. An 840-count fabric-wrapped pocketed coil system sits at the core. A shock-absorbing high-density base foam anchors everything.
SETUP AND COMPATIBILITY: The Onyx Medium is suitable for adjustable bases, platform frames, and standard box springs. Delivered flat with professional in-home setup available.
NOT A FIT FOR: Stomach sleepers who need a firmer surface for neutral hip alignment, or anyone whose preference firmly leans plush.
YOUR SLEEP, BACKED BY US
Every mattress purchase at Mancini's Sleepworld includes a 120-night comfort guarantee backed by our Rest Easy Promise, plus the Best Price Guarantee. Add a premium mattress protector at checkout and that guarantee extends to a full 365 nights. Come try this mattress in person at any of our locations before you buy, and enjoy free next-day delivery, in-home professional setup, and flexible financing when you're ready to bring it home.
- 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-6SM-MED-25
- MPN: 25WICRAFM_FP36X84
- GTIN: 810146419273
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Medium
- Height: 13
- Length: 84
- Width: 36
- Shipping Height: 13
- Shipping Width: 84
- Shipping Length: 36
- Warranty: 10 Year
- Cover Material: Polyester Knit
- Quilting Layers: 2 H.D. Super Soft Quilt Foam,3/4 H.D Gel Infused M - Foam
- 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