Mancini’s Sleepworld Onyx Extra Firm Mattress 13″

Mancini’s Sleepworld Onyx Extra Firm Mattress 13″ · Queen

The Mancini’s Sleepworld Onyx Extra Firm Mattress 13″ is an innerspring mattress built for back and stomach sleepers who need a firm mattress for back pain relief that actually holds up over time. At 13 inches tall, it layers a cooling knit cover, gel memory foam, and a heavy-gauge coil system into a profile that keeps the lumbar lifted without any of the pressure buildup that plush mattresses create. The foams are CertiPUR-US certified, so you can rest without wondering what’s off-gassing beneath you. Stop by any Mancini’s Sleepworld location and a sleep specialist will walk you through this model next to every competing option so you can feel the difference for yourself.

COMFORT AND FEEL: Extra firm and flat, with a coil-driven push-back that keeps hips from sinking.

SIZE: This queen sized mattress is ideal for couples and solo sleepers who need maximum support across a 60″ x 80″ surface.

BEST SLEEP MATCH: Built for back and stomach sleepers seeking an extra firm feel. The flat, supportive surface keeps the spine in line all night and stops the hips from drifting out of position.

BEST FOR: Ideal for sleepers who need strict spinal support, run warm overnight, or wake up stiff from sinking too deep into their mattress.

CONSTRUCTION SPECIFICATIONS: The heavyweight cold-feel stretch knit cover moves heat away before it builds up. Gel-infused memory foam in the quilt layer absorbs warmth and keeps the surface feeling fresh. Firm and extra firm high-density foam comfort layers keep your hips from dropping. The fabric-wrapped coil system uses super heavy-gauge wire, so the bed holds its shape and its support for years.

SETUP AND COMPATIBILITY: Delivered flat with in-home professional setup available. Compatible with adjustable bases, platform frames, and box springs. No tools needed on your end.

NOT A FIT FOR: Side sleepers who need deep pressure relief at the hip and shoulder, or anyone who prefers a plush or contouring feel.

YOUR SLEEP, BACKED BY US

Every mattress at Mancini’s Sleepworld comes with a 120-night comfort guarantee as part of our Rest Easy Promise, along with our Best Price Guarantee and free next-day delivery. Add a premium mattress protector at the time of purchase and your guarantee extends to a full 365 nights, giving you an entire year to be certain. Flexible financing is available, and you can try this mattress in person at any of our locations before you buy.