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\n\n\n", "length": "80", "depth": "60", "sizeSelect": "Size: 60″ x 80″" } ], "resetUrl": "https://www.sleepworld.com/on/demandware.store/Sites-Sleepworld-Site/en_US/Product-Variation?dwvar_BRK-ONY-5M-FM-25-config_size=&pid=BRK-ONY-5M-FM-25-config&quantity=1" } ], "longDescription": "

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.

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Mancini's Sleepworld Onyx Firm Mattress 13\" · Queen

⭐⭐⭐⭐ 3.5 · 10+ verified sleepers

The Mancini's Sleepworld Onyx Firm Mattress 13\" is an innerspring mattress built for back sleepers and anyone chasing a firm mattress for back pain relief without losing the light body cushioning that makes firm beds livable. At 13 inches tall, it packs a meaningful coil system beneath structured foam comfort layers that work together to keep your lumbar in line while the gel-infused quilt layer takes the edge off pressure points at the hips and shoulders. The result is a mattress that sleeps genuinely firm without feeling punishing. If you want to put it side by side with every competing option at this price point before committing, stop by any Mancini's Sleepworld location and a sleep specialist will walk you through exactly that.

COMFORT AND FEEL: Firm and lifted with a cool, lightly cushioned surface that supports without contouring deeply.

SIZE: This queen sized mattress is a strong fit for solo back sleepers and couples who both prefer a firm, non-sinking sleep surface.

BEST SLEEP MATCH: Back sleepers will get the most from this firm innerspring mattress. The pocketed coil system keeps the lumbar supported through the night, making it a natural fit for those who wake up stiff.

BEST FOR: Ideal for sleepers who need spinal support, run warm at night, or have been waking up with lower back tension on a softer bed.

CONSTRUCTION SPECIFICATIONS: The heavyweight stretch knit cover is cool at first contact and pulls heat away from the surface. A gel-infused memory foam quilting layer cushions the hips and shoulders without allowing deep sinkage. Firm and extra-firm high-density comfort foams underneath hold your body position steady. The 8-inch pocketed coil system with fabric wrapping isolates motion and keeps the spine aligned. A shock-absorbing base layer protects the structure over time. Foams are CertiPUR-US certified.

SETUP AND COMPATIBILITY: The Onyx Firm ships flat and is compatible with adjustable bases, platform frames, and traditional box springs. Professional in-home setup is included with delivery.

NOT A FIT FOR: Side sleepers who need deep pressure relief at the shoulder may find this feel too firm. Not the right fit for sleepers who prefer a plush or contouring surface.

YOUR SLEEP, BACKED BY US

Every mattress at Mancini's Sleepworld comes with a 120-night comfort guarantee and our Rest Easy Promise. Visit any location to try this mattress in person before you buy, and ask about flexible financing to make it work for your budget. Adding a premium mattress protector at time of purchase upgrades your guarantee to a full 365 nights, giving you an entire year of certainty. Free next-day delivery and professional in-home setup are included, and our Best Price Guarantee means you will not find it lower elsewhere.

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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.

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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.

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Mancini's Sleepworld Onyx Firm Mattress 13"

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\n", "productUrl": "/mancini%27s-sleepworld-onyx-firm-mattress-13in/BRK-ONY-3M-FM-25.html" }