Beautyrest
Beautyrest Black® Series Three 14.25" Extra Firm Mattress
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The honest verdict: the Series Three Extra Firm is firm support at the upper tier. At about an 8 out of 10 it keeps you firmly on top of the bed (hips lifted, spine level, the way back and stomach sleepers need), but it brings the Series Three upgrades a basic firm bed lacks: Self-Response™ Latex for a touch of responsive give, SurfaceTouch™ Gel quilted right into the surface, and Micro Diamond™ cooling so a firm surface doesn't sleep hot. If you want genuinely firm without the bare, hard feel of a budget bed, this is the one.
What you notice the first few minutes lying on it
Lie down on your back and the first thing you feel is the floor of support: hips held up, spine level, the alignment a back or stomach sleeper is after. This is sleep-on-top-of-it firm, not a bed that pulls you in. What separates it from a plain budget firm is the half-second after you land, when the SurfaceTouch™ Gel and Self-Response™ Latex give the very top a little responsive yield, so you meet a surface with some life to it instead of a hard board. And because a firm bed rests you on top of the materials, the Micro Diamond™ cooling earns its place here, while the pocketed-coil core underneath breathes more than all-foam would.
What it's made of, and what that does for you
- A firm 8/10 feel. Strong support that keeps your hips from sinking and your spine level, built for back and stomach sleepers.
- A classic quilted surface with SurfaceTouch™ Gel. Gel memory foam quilted directly into the top gives immediate surface comfort the moment you lie down.
- Self-Response™ Latex. A measured, ventilated latex layer adds responsive give and airflow, taking the bare edge off the firmness without softening the support.
- Micro Diamond™ cooling and a cool-to-the-touch cover. Sleep Climate™ materials pull heat off a surface that sits you close to the materials, where a firm bed needs it most.
- Triple-Stranded Pocketed Coil® core, 14.25 inches. The firm support and Black's most advanced motion separation underneath.
- Premium Black build, 10-year warranty. Upper-tier firm, with comfort and cooling a basic firm bed can't match.
Those Triple-Stranded Pocketed Coils move independently, so a partner shifting or climbing out early barely crosses to your side. It works on an adjustable base, and the foams are CertiPUR-US certified, made without formaldehyde, prohibited phthalates, or heavy metals.
Who it's not for, said plainly
- Side sleepers: an 8/10 firm will press on your shoulder; a medium or plush Black is the better fit.
- If you want the most accessible extra-firm Black, the Series One Extra Firm delivers a firmer-feeling entry without the Series Three upgrades.
- If you want a cradle or pillow-top softness, this is firm and supportive by design.
Series Three versus Series One Extra Firm
The closest call most people weigh is this bed against the Series One Extra Firm. Both land at the same 8 out of 10, so the support and the on-top feel are similar. The difference is what sits over the coils: the Series One leaves the bare edge on, while the Series Three adds the SurfaceTouch™ Gel, Self-Response™ Latex, and Micro Diamond™ cooling that soften the surface and keep a firm bed from running warm. Neither is more supportive, so the only question is whether those upgrades earn their keep for you, which is a lying-down decision. See where it sits in the full Beautyrest Black lineup.
Why buy it from Mattress Overstock
Locally owned and serving Kentucky since 2012, with five showrooms you can actually walk into: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. No appointment needed. Firm is the most personal word in mattresses, and whether an upper-tier firm is worth it over a basic one is a decision you make lying down, not reading a screen. Come feel the Series Three Extra Firm beside the Series One on the same visit and let your back settle the question.
You also get a 100-day comfort guarantee: if the feel isn't right, you exchange it for store credit toward any bed of equal or greater value. No cash refund, but no restocking-fee games either. Free local delivery, free setup, and free old-mattress haul-away, usually next business day when your size is in stock. And no one on the Mattress Overstock floor earns more for steering you up a tier, so the guidance is honest.
Ready to feel it? Compare the firm tiers in the Beautyrest Black lineup, then come lie on this one in Lexington, Georgetown, Somerset, London, or Richmond this week.
What makes this mattress different
Upper-tier extra firm (8/10)
Strong coil support for back and stomach sleepers, with Series Three comfort and cooling a basic firm bed lacks.
Classic quilted surface, SurfaceTouch™ Gel
Gel memory foam quilted right into the top for immediate surface comfort the moment you lie down.
Self-Response™ Latex
A measured, ventilated latex layer adds responsive give and airflow, taking the bare edge off the firmness without softening the support.
Micro Diamond™ cooling + cool-to-the-touch cover
Sleep Climate™ materials pull heat off the surface, which matters on a firm bed that sits you close to the materials.
Triple-Stranded Pocketed Coil® core
Firm 14.25-inch support with Black's most advanced motion separation, so a partner's movement barely crosses the bed.
CertiPUR-US certified foams
Made without formaldehyde, prohibited phthalates, or heavy metals, and tested for low VOC emissions.
Adjustable-base ready, 10-year warranty
Works flat or on an adjustable base, backed by a 10-year limited warranty on a premium Black build.
Firm support, upgraded comfort and cooling
The Series Three Extra Firm is built layer by layer to feel firm on top while taking the hard edge off a budget firm bed. From the surface down:
Cool-to-the-touch cover. A Sleep Climate™ cover that feels cool when you first lie down and helps move heat away through the night.
SurfaceTouch™ Gel, quilted in. Gel memory foam quilted directly into the surface for immediate pressure relief the moment you land, without adding a soft pillow-top.
Self-Response™ Latex. A responsive, ventilated latex layer that gives the top a little life and adds airflow, so the firmness reads supportive rather than hard.
Micro Diamond™ Memory Foam. Diamond-infused foam that draws heat off the comfort layers, the cooling a firm surface needs because it sits you close to the materials.
Triple-Stranded Pocketed Coil® core. A firm-tuned coil unit that carries the support and delivers Black's most advanced motion separation, then breathes more than an all-foam core would.
This is the quilted Black build, coils under real foam comfort layers, kept firm by design. For a firmer-feeling entry without the latex, gel, and diamond-foam upgrades, see the Series One Extra Firm, or compare the firm tiers in the Beautyrest Black lineup.
Shop the Beautyrest Black lineup →What's inside Beautyrest Black
Five layers, engineered together: a cool quilted surface, pressure-relieving gel foam, and the Triple-Stranded Pocketed Coil® core that defines the Black line.
Upper-tier firm for back and stomach sleepers
Back sleepers: strong coil support keeps the spine level and the hips from dipping, with more comfort and cooling than a basic firm bed.
Stomach sleepers: the firm feel keeps the hips from sagging and the lower back from arching, the alignment this position needs.
Heavier back and stomach sleepers: a firm pocketed-coil floor tends to hold support better over time than a soft top that bottoms out, which is why an 8/10 like this is a common pick.
Couples and lighter sleepers: Triple-Stranded Pocketed Coils move independently, so a partner shifting or getting up early barely carries across the bed.
Firm-bed people who run warm: the cool-to-the-touch cover and Micro Diamond™ foam target the heat a firm surface can hold against you.
Probably not for you if you sleep on your side (a medium or plush Black cradles the shoulder better), you want a soft pillow-top cradle, or you want the most accessible extra-firm (the Series One Extra Firm).
Specifications
| Height | 14.25" |
|---|---|
| Feel | Extra Firm |
| Firmness | 8 out of 10 (10 = firmest) |
| Construction | Cool-to-the-touch cover and SurfaceTouch™ Gel over Self-Response™ Latex, Micro Diamond™ foam, and a firm-tuned Triple-Stranded Pocketed Coil® core: 14.25 inches, extra firm. |
| Cooling | Series Three cooling: Micro Diamond™ memory foam and a cool-to-the-touch cover pull heat off the surface, over a Triple-Stranded Pocketed Coil core that breathes more than all-foam. |
| Motion isolation | Excellent. Triple-Stranded Pocketed Coils move independently, so a partner's movement barely crosses the bed. |
| Adjustable base | Yes, compatible with adjustable bases |
| Certifications | CertiPUR-US certified foams |
| Warranty | 10-year limited warranty |
| Trial period | 100 days at Mattress Overstock |
Frequently asked questions
How firm is the Series Three Extra Firm?
About an 8 out of 10, the firmest Series Three. Strong, supportive, sleep-on-top-of-it firm, but with SurfaceTouch™ Gel and Self-Response™ Latex taking the bare edge off, and Micro Diamond™ cooling so it doesn't sleep hot.
How is it different from the Series One Extra Firm?
Both are an 8/10 firm, so the support and on-top feel are similar. Series Three adds SurfaceTouch™ Gel, Self-Response™ Latex, and Micro Diamond™ cooling for more surface comfort and cooling. The Series One Extra Firm is the more accessible firm. Lie on both to feel whether the upgrades are worth it to you.
Is this a hybrid or an innerspring?
It's the classic quilted Black build: a quilted surface over real foam comfort layers (gel, latex, and Micro Diamond™ foam) on a Triple-Stranded Pocketed Coil® core, so it behaves like a hybrid, coils plus substantial foam. Beautyrest reserves the word Hybrid for its separate Black Hybrid line, which uses a smooth zippered cover instead of this quilted one. Either way, the coil core here gives you the firm support and Black's motion separation.
What is the mattress made of, layer by layer?
From the top down: a cool-to-the-touch Sleep Climate™ cover, SurfaceTouch™ Gel quilted into the surface, Self-Response™ Latex, Micro Diamond™ Memory Foam, and a firm-tuned Triple-Stranded Pocketed Coil® support core. It stands 14.25 inches tall.
Does it sleep hot?
It's built not to. A firm bed sits you on top of the materials, so Beautyrest puts its cooling here: a cool-to-the-touch Sleep Climate™ cover and Micro Diamond™ Memory Foam to move heat off the surface, over a pocketed-coil core that breathes more than an all-foam bed.
Does it have fiberglass?
No. The foams in this Beautyrest Black are CertiPUR-US certified, made without formaldehyde, prohibited phthalates, or heavy metals, and tested for low VOC emissions. As with any mattress, keep the cover on and you never need to expose the inner layers.
Can I use it on an adjustable base?
Yes. The Series Three Extra Firm works on a standard flat foundation or an adjustable base. If you'd like to pair it with an adjustable base, just ask on the showroom floor and we'll show you the options.
Do I need a box spring or special foundation?
It needs firm, even support underneath: a solid platform, slats no more than a few inches apart, an adjustable base, or a matching foundation. A sagging old box spring can undermine the feel and the warranty, so if yours is worn, ask us and we'll point you to the right base.
What sizes does it come in, and how do I make sure it fits?
It comes in the standard sizes from Twin XL up to California King. Because it stands 14.25 inches tall, measure your frame and check your sheets: deep-pocket fitted sheets fit a bed this height best. Tell us your room and frame in the showroom and we'll confirm the right size before you buy.
Can I see this mattress in person near me, and how do delivery and the guarantee work?
Yes, and with a mattress we'd 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. We deliver free across our Kentucky service area, set it up, and haul your old mattress away, usually next business day when your size is in stock. You also get a 100-day comfort guarantee: if the feel isn't right, exchange it for store credit toward any bed of equal or greater value (no cash refund). 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.
