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Extra Firm
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On Sale
Overview
- SleepMatch: red
Mancini's Sleepworld Onyx Extra Firm Mattress 13"
- Extra firm innerspring built for real spinal support
- Cooling stretch knit cover draws heat away overnight
- Gel memory foam layer cushions without letting you sink
- Fabric-wrapped pocketed coils absorb motion, stay quiet
- High-density upholstery foam base holds its shape for years
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In Stock
Overview
Mancini's Sleepworld Onyx Extra Firm Mattress 13" Twin XL
⭐⭐⭐⭐⭐ 5 · 5+ verified sleepers
The Mancini's Sleepworld Onyx Extra Firm Mattress 13" is an innerspring mattress built for back sleepers and stomach sleepers who need a no-compromise firm mattress for back pain relief. At 13 inches tall, it layers gel memory foam comfort over a pocketed coil support system reinforced with super high-density upholstery-grade foam, giving you the kind of lift under the lumbar that softer beds simply cannot deliver. If you have been waking up stiff or rolling toward the center of a worn-out mattress, this is the correction. Stop by any Mancini's Sleepworld location and a sleep specialist will put this next to every competing option so you can feel the difference before you commit.
COMFORT AND FEEL: Extra firm feel with minimal sink, keeping your spine lifted and level all night.
SIZE: This Twin XL sized mattress is a smart fit for taller single sleepers, college dorms, and adjustable base setups that need extra length without extra width.
BEST SLEEP MATCH: Built for back sleepers and stomach sleepers who need an extra firm surface. The flat, unyielding feel keeps the hips from dropping and the lower back from arching overnight.
BEST FOR: Ideal for sleepers who need firm back support, want to stop rolling toward the middle, or consistently wake up with lower back or hip tension.
CONSTRUCTION SPECIFICATIONS: The heavyweight stretch knit cover is engineered to sleep cool, pulling warmth away from the surface. A gel memory foam quilting layer adds just enough cushion without softening the feel underfoot. Firm support H.D. foam and extra firm H.D. support foam sit above a 720-coil, 13.5-gauge pocketed coil system wrapped in fabric to limit motion. A shock-absorbing H.D. base layer keeps the whole structure from softening over time. Foams are CertiPUR-US certified.
SETUP AND COMPATIBILITY: Compatible with adjustable bases, platform frames, and standard box springs. Delivered flat with professional in-home setup included, no tools needed.
NOT A FIT FOR: Side sleepers or anyone who needs pressure relief at the shoulder and hip. This mattress is built to resist sinkage, not encourage it.
YOUR SLEEP, BACKED BY US
Every mattress purchase at Mancini's Sleepworld is backed by the Rest Easy Promise, which includes a 120-night comfort guarantee, free next-day delivery, professional in-home setup, and our Best Price Guarantee. Add a premium mattress protector at the time of purchase and you can choose to upgrade your guarantee to a full 365 nights. Flexible financing is available, and you can try this mattress in person at any Mancini's Sleepworld showroom before you buy.
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: red
Mancini's Sleepworld Onyx Extra Firm Mattress 13"
Features
- SKU: BRK-ONY-3XM-XF-25
- MPN: 25WICRAFEF_FP33XL
- GTIN: 810146419051
- Brand: Mancini's
- Collection: Sleepworld
- Type: Innerspring
- Mattress In A Box: No
- Firmness: Extra Firm
- Height: 13
- Length: 80
- Width: 38
- Shipping Height: 13
- Shipping Width: 80
- Shipping Length: 38
- Warranty: 10 Year
- Cover Material: Polyester Knit
- Quilting Layers: 3/4 Extra Firm Quilt Poly,3/4 H.D Gel Infused M - Foam
- Comfort Layers: 1'' Firm Support H.D. Foam ,1.5'' Extra Firm H.D. Support Foam
- Support System: 720 13.5 Ga. 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