Sealy
Sealy Posturepedic®13" Ultra-Firm Mattress
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The honest verdict: the Sealy Posturepedic Ultra-Firm is for people who genuinely want a hard, supportive bed and have given up finding one. It is an innerspring built on Sealy's Posturepedic Spring platform, a thin comfort layer over a deep coil unit, minimal cushion by design, so you sleep firmly on top with your hips lifted and your spine held flat. At the firm end of the scale (about 8 out of 10) it is the firmest mattress on the Mattress Overstock floor, built for back and stomach sleepers who find most beds too soft. If the "firm" models at other stores still sink under you, this is the one to lie on.
What it is made of, and what that does for your back
The build is honest and uncomplicated, the opposite of a thick pillow-top stack. A traditional innerspring unit does the real work: over 700 responsive coils tuned for maximum support and a flat, on-top feel rather than for plushness. A deliberately thin comfort layer over the coils takes the bare hard edge off without softening the support underneath, all under a breathable cover. There is no deep foam pillow-top, and on this model there is not meant to be.
- Responsive coil support unit: over 700 encased coils that move independently for targeted, deep-down support and Sealy's Center Support to keep your spine aligned.
- Thin comfort foams: minimal cushion by design, just enough to take the bare edge off the coils, CertiPUR-US certified.
- Breathable cover over a 13-inch, ultra-firm build: the firmest mattress in the lineup, made for sleeping on top of the bed rather than down in it.
- Backed for the long run: a 10-year limited warranty on a dependable, no-nonsense firm coil bed from a brand with 140 years behind it.
What you notice in the first few minutes
Lie down on your back and the surface meets you almost immediately. There is very little of the slow give of a thick foam top, so your hips stay lifted and your lower back settles into a flat, supported line instead of dipping. Roll onto your stomach and the bed holds your midsection up rather than letting it hammock, which is exactly what stomach sleepers tend to be missing on a softer bed. Most firm-bed sleepers know within a minute or two whether this is their feel.
Who it is not for, said plainly
Ultra-firm is a specific taste, and the wrong one for a lot of good sleepers. The Mattress Overstock team would rather point you to the right bed than sell you a sore shoulder.
- Side sleepers: there is very little give for the shoulder and hip, so pressure builds fast. A medium or soft Sealy is the better fit.
- If you want some cushion without leaving this exact bed: the same Posturepedic platform comes in a 13-inch Medium, a true middle-of-the-road feel over the same coil support.
- If you want a genuinely cushioned top: the 15-inch Medium Euro Top adds a plush pillow-top while staying supportive over coil.
- If you want a deep memory-foam hug: this is the opposite, maximum support and minimal sink, and it will not break in soft over time.
Living with it over time
Switching from a worn-out pillow-top or a sagging foam bed feels dramatic at first, because you are trading sink for support, and most firm-bed sleepers settle in within a few nights. One honest note on motion: as a traditional innerspring it transfers a bit more movement across the bed than a pocketed-coil hybrid or an all-foam mattress, so a restless partner is worth knowing about going in. It also works with an adjustable base, so a firm surface does not lock you out of raising the head or feet.
Why buy it from Mattress Overstock
An independent Kentucky retailer since 2012, with five showrooms you can walk into, no appointment needed: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Ultra-firm is a feel you should confirm with your own back, so lie on this exact mattress in your own sleeping position before you commit. Mattress Overstock holds a steady 4.7 stars across more than 500 Google reviews, much of it from people who were sent home with the right bed rather than the priciest one.
You get a 90-day comfort guarantee; if it is not right, you exchange it for store credit toward any bed of equal or greater value, no cash refund, but no restocking-fee games either. Delivery, setup, and old-mattress haul-away are free across the Kentucky service area. And no one on the Mattress Overstock floor earns more for steering you to one brand over another, so the guidance you get is honest. When you are ready, select your size to see the live Mattress Overstock price, or come lie on it in Lexington this week.
Compare it with the more cushioned options in the full Sealy lineup.
What makes this mattress different
Maximum coil support
Over 700 responsive coils tuned for a firm, on-top feel: the firmest mattress we carry.
Minimal cushion by design
A thin comfort layer takes the bare edge off without softening the deep coil support.
Spine held flat
Sealy's Center Support keeps your hips lifted and your back aligned, the point of an ultra-firm bed.
Sleeps cool over coils
A breathable cover and the airflow of the coil unit shed heat an all-foam bed traps.
CertiPUR-US certified foams
The comfort layer is tested for content, emissions, and durability, no fiberglass surprises.
13-inch ultra-firm build
Built for back and stomach sleepers who find most beds, even most firm ones, too soft.
10-year warranty, 90-day guarantee
A dependable no-nonsense coil bed, backed long-term and exchangeable if the feel is not right.
Maximum support, minimal cushion
The Posturepedic Ultra-Firm is built on Sealy's Posturepedic Spring platform, a coil mattress made for firmness rather than plushness. From the bottom up: a support unit of over 700 encased coils that move independently for targeted, deep-down support and reduced motion versus a loose innerspring; Sealy's Center Support engineering to keep your spine aligned; a deliberately thin comfort layer of CertiPUR-US foam that takes the bare hard edge off the coils without softening them; and a breathable cover on top. At 13 inches, the whole point is to sleep on top of the bed, hips lifted and spine flat, with very little sink. It is the firmest option we carry.
Want some cushion while staying supportive? The same platform comes as a 13-inch Medium, and the 15-inch Medium Euro Top adds a genuinely plush pillow-top. See the full Sealy lineup.
Shop the Sealy lineup →For dedicated firm-bed sleepers
Back sleepers who want it hard: the coil unit keeps your hips from sinking and holds your lower back in a flat, supported line.
Stomach sleepers: one of the few feels that holds your midsection up instead of letting it hammock, which is what most stomach sleepers are missing.
People who find most beds too soft: if even the "firm" models at other stores sink under you, this is the firmest we carry and built for you.
Heavier sleepers wanting strong support: over 700 coils hold firm and resist the bottoming-out that softer beds give over time.
Hot sleepers who also want firm: the breathable cover and coil airflow shed heat far better than a dense all-foam bed.
Probably not for you if you sleep on your side (try a medium or soft Sealy), want a true middle feel (the 13-inch Medium), want real cushion (the Medium Euro Top), or like sinking into a foam hug.
Specifications
| Height | 13" |
|---|---|
| Feel | Firm |
| Firmness | 8 out of 10 (10 = firmest) |
| Construction | A cooling cover and a thin comfort layer over a supportive innerspring coil unit tuned for maximum firmness: 13 inches, ultra-firm. |
| Cooling | A cooling cover and the natural airflow of the innerspring coil unit help it sleep cooler than an all-foam bed. |
| Motion isolation | Moderate: as a traditional innerspring it transfers a bit more motion than a pocketed-coil hybrid or all-foam bed. |
| Adjustable base | Yes, compatible with adjustable bases |
| Certifications | CertiPUR-US certified foams |
| Warranty | 10-year limited warranty |
| Trial period | 90 days at Mattress Overstock |
Frequently asked questions
How firm is the Ultra-Firm, really?
It is the firmest mattress we carry, beyond a typical firm, about an 8 out of 10. The comfort layer is deliberately thin, so you sleep on top of the coil unit with very little sink. If most beds labeled "firm" still feel too soft to you, this is built for you. The surest test is two minutes on it in your own sleeping position at one of our showrooms.
Is there any cushion at all?
A little. A thin comfort layer takes the bare hard edge off the coils, but cushion is minimal by design. If you want support with a true middle feel, the same platform comes as a 13-inch Medium. If you want a genuinely plush top, the Medium Euro Top is a much softer surface over coil support.
What is it actually made of?
It is built on Sealy's Posturepedic Spring platform: a support unit of over 700 encased coils that move independently, Sealy's Center Support to keep your spine aligned, a thin CertiPUR-US comfort layer, and a breathable cover, in a 13-inch profile. No deep foam pillow-top, by design.
Is it good for back pain?
Many back and stomach sleepers prefer very firm support to keep the spine aligned and the hips from dipping. That said, firmness preference is personal, and an ultra-firm bed is too much for many side sleepers, who can wake with a sore shoulder. We always recommend lying on it in your own position, and we will not claim a mattress is a medical fix.
Does it sleep hot?
Less than you might expect for a firm bed. There is no thick foam layer to trap body heat, and the coil unit lets air move through, so the breathable cover and that airflow shed heat far better than a dense all-foam mattress. Firm coil beds are usually among the cooler-sleeping options.
Will it be too much motion for a partner?
Worth knowing going in: as a traditional innerspring it transfers a bit more movement across the bed than a pocketed-coil hybrid or an all-foam mattress. The coils are responsive and reduce some of that, but if you have a restless partner and motion is your top concern, a hybrid may suit you better.
Can I use it with an adjustable base?
Yes. The Ultra-Firm pairs with an adjustable base, so a firm sleeping surface does not lock you out of raising the head or feet. Ask the floor which base fits your size and frame, and we will set it up on delivery.
Does it have fiberglass?
The comfort foam is CertiPUR-US certified, which tests for content, emissions, and durability. For the exact cover and fire-barrier materials on the size you want, ask us in the showroom and we will confirm the spec for that model before you buy.
How do delivery and the comfort guarantee work?
We deliver across Kentucky with our own team, usually next business day when your size is in stock, and we haul the old mattress away, all free in our service area. You also get a 90-day comfort guarantee: if the feel is not right, exchange it for store credit toward any bed of equal or greater value (no cash refund, but no restocking-fee traps).
Can I see this mattress in person near me?
Yes, and with a mattress we would always rather you did. Mattress Overstock is a Kentucky-owned company that has served the state since 2012, with five showrooms you can visit: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Come lie on this exact mattress in your own sleeping position before you decide. We deliver free across our Kentucky service area and haul your old mattress away, and because everyone on our floor is paid the same no matter which brand you choose, the guidance you get is honest.
Buy it from people you can actually visit
- Free local delivery To your home across Central & Eastern Kentucky.
- Free setup We place and set up your new bed in the room.
- Free old-mattress haul-away The old one goes out the same day the new one comes in.
Independently owned in Kentucky since 2012. Walk in any day (no appointment) and someone who actually knows the floor will help you find the right fit.
Still deciding?
Try it in person at any Kentucky showroom
Walk into any Mattress Overstock location, lie down, and feel the difference yourself. No appointment, no pressure. Our team has over 100 years of combined mattress experience and we're here to help you find the right fit.
