Sealy
Sealy Posturepedic®13" Ultra-Firm Mattress
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- Ultra-Firm, innerspring mattress offers full-body support that holds you and provides ease of movement.
- Stretch-knit cover with MoistureProtect™ and Surface-Guard Technology™ wicks away moisture and helps keep your mattress protected while helping you sleep cool and comfortably.
- Breathable, cushioning gel foam layer adapts to your body to help relieve pressure points.
- Individually wrapped coils to the edge of the mattress provide a more usable and supportive sleep surface, targeted support, and reduced motion transfer.
- Zoned support targets the heaviest part of your body in the center third of the mattress.
- Enjoy full-body support that helps you move comfortably while you sleep for overall healthier sleep.
- An unprecedented level of comfort, breathability, and protection help you sleep cool and healthy each night.
What makes this mattress different
Pressure relief
The upper comfort layers are tuned to reduce pressure buildup at the shoulders and hips.
Cooling
Breathable cover and open-cell comfort materials help reduce heat buildup
Motion control
Good - supportive and steady, but it transfers more movement than a dense foam or pocketed-coil design
Adjustable-base ready
Yes, compatible with adjustable bases
Sealy Posturepedic support is built around alignment, not just softness
Sealy uses the support core and zoning to keep your midsection from sagging first, then tunes the upper comfort layers around that foundation.
As you move from basic Posturepedic models into Plus and Elite builds, the main changes are in cooling, edge support, and how much cushioning sits over the support unit.
Compared with the Sealy Posturepedic13" Medium, the Sealy Posturepedic13" Ultra-Firm is firmer and flatter than the Sealy Posturepedic13" Medium. That is the practical difference you feel in the showroom: the firm surface changes how deeply you settle in, while the underlying support build changes how easy it is to move and how steady the edge feels.
Shop all Sealy mattresses →Built for the way you actually sleep
Back sleepers - The flatter, sturdier surface keeps the midsection from dipping too far, which is usually the reason shoppers move into the firm version.
Stomach sleepers - This is the safer choice if you need more pushback through the pelvis and lower back than a medium model usually gives.
Hot sleepers - Cooling details in the cover and upper layers help, but if temperature is your top issue, the hybrid or step-up cooling model is usually the smarter comparison.
Shoppers cross-shopping the lineup - If the Sealy Posturepedic13" Ultra-Firm feels either too flat or too plush in person, the closest adjustment is usually the Sealy Posturepedic13" Medium.
Specifications
| Height | 13" |
|---|---|
| Feel | Firm |
| Firmness | 8 out of 10 (10 = firmest) |
| Construction | Cooling cover + comfort foams + supportive coil unit |
| Cooling | Breathable cover and open-cell comfort materials help reduce heat buildup |
| Motion isolation | Good - supportive and steady, but it transfers more movement than a dense foam or pocketed-coil design |
| Weight capacity | — |
| 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 Sealy Posturepedic13" Ultra-Firm?
We rate it 8 out of 10 (10 = firmest). In practical terms, that puts it in the firm part of the lineup. The right fit depends on your sleeping position, body type, and whether you like to sleep more on top of the mattress or more in it.
How is the Sealy Posturepedic13" Ultra-Firm different from the Sealy Posturepedic13" Medium?
The Sealy Posturepedic13" Ultra-Firm and the Sealy Posturepedic13" Medium are close enough in the lineup that most shoppers should compare them side by side. The biggest difference is feel: the Sealy Posturepedic13" Ultra-Firm lands on the firm side of the lineup, while the Sealy Posturepedic13" Medium feels more medium.
Does it work with an adjustable base?
Yes, compatible with adjustable bases.
How fast can I get it delivered in Kentucky?
We deliver with our own team across Kentucky. Most orders arrive the next business day when the size is in stock. Pickup is available at our Lexington, Georgetown, Somerset, London, and Richmond locations.
What if I do not like it after a few nights?
You have 90 days to make sure the comfort is right. We usually recommend giving any new mattress at least 21 nights before making a comfort decision, because covers and foams need time to settle and your body needs time to adjust.
Can I try it before I buy?
Yes. We have these models represented across our Kentucky showrooms, so you can lie down on the feel before you buy. Walk in, take your time, and compare it against the nearby step-up and step-down models.
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.