Casper One Firm Mattress 11″

Casper One Firm Mattress 11″ Queen

The Casper One Firm Mattress 11″ is an all-foam mattress built for back and stomach sleepers who want reliable spinal support without the stiffness of a traditional firm bed. A firm mattress for back pain relief, the One layers three distinct foams in a straightforward stack that does exactly what it promises: keeps your body lifted, reduces pressure at the hips and lower back, and stays breathable from the first night. Every layer is built with all-night airflow in mind, so warmth never has a chance to build up underneath you. If you want to feel the difference between this and every competing option on the floor, stop by any Mancini’s Sleepworld location and our sleep specialists will put this right next to them so you can decide for yourself.

COMFORT AND FEEL: Firm all-foam feel with a responsive surface and steady lumbar support underneath.

SIZE: This queen sized mattress is the go-to for solo back sleepers or couples who both prefer a firmer, more supportive feel.

BEST SLEEP MATCH: Back and stomach sleepers will feel most at home here. The firm mattress for back sleepers feel keeps the hips from dropping, so your lower back stays in a neutral position all night.

BEST FOR: Ideal for sleepers who need lower back support, prefer a responsive surface over dense memory foam, or wake up stiff from a mattress that lets them sink too deep.

CONSTRUCTION SPECIFICATIONS: Breathe Flex Foam® sits at the top, letting air move through an open-cell surface that responds quickly when you shift positions. Align Memory Foam sits beneath it, gently cradling the hips and shoulders without that slow, trapped feeling. The Casper Core base holds everything firm, resisting the compression that causes a mattress to soften and slope over time.

SETUP AND COMPATIBILITY: Arrives rolled and compressed in a box, expands within 24 hours, no tools needed. Compatible with adjustable bases, platform frames, and box springs.

NOT A FIT FOR: Side sleepers who need deep cushioning at the shoulder may find the firm feel too resistant. Those who prefer a plush, sink-in surface should consider a softer model.

YOUR SLEEP, BACKED BY US

Every mattress purchase at Mancini’s Sleepworld comes with a 120-night comfort guarantee, and our sleep specialists are here before, during, and after the sale. Add a premium mattress protector at the time of purchase and extend your guarantee to a full 365 nights. We also back every purchase with our Best Price Guarantee, free next-day delivery, in-home professional setup, and flexible financing. Come try the Casper One in person at any Mancini’s Sleepworld showroom before you decide. Our Rest Easy Promise means you never have to guess.