Beautyrest
Beautyrest Black® Series Three 15" Firm Mattress
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The honest verdict: the Series Three Firm is firm support at the upper tier. At about a 7 out of 10 it keeps your hips lifted and your spine level the way back and stomach sleepers need, with the Series Three upgrades a basic firm bed lacks: Self-Response™ Latex for responsive give, SurfaceTouch™ Gel for surface comfort, and Micro Diamond™ cooling so a firm surface stays cool. If you want genuinely firm Beautyrest Black with refined comfort and real cooling, this is the one.
What it's made of, and what that does for you
- A firm 7/10 feel. Supportive and on-top (hips lifted, spine level) without the absolute hardness of an extra-firm bed.
- Self-Response™ Latex + SurfaceTouch™ Gel. A responsive latex layer and surface gel take the bare edge off the firmness without softening the support.
- Micro Diamond™ cooling + cool-to-the-touch cover. The Series Three cooling upgrade, which matters on a firm surface that sits you close to the materials.
- Triple-Stranded Pocketed Coil® core, 15 inches. Firm support and Beautyrest's most advanced motion separation under the comfort layers.
- Premium Black build, 10-year warranty. Upper-tier firm with comfort and cooling a basic firm bed can't match.
What you notice lying on it
Lie down on your back and the support pushes back: your hips stay up, your spine settles level, and your lower back stays in contact with the surface instead of dropping into it. That is the firm-tuned Triple-Stranded Pocketed Coil® core. What keeps it from reading as hard is the layer above it, where the Self-Response™ Latex gives a quick, responsive push instead of a dead-flat board and the SurfaceTouch™ Gel takes the bare edge off where your shoulders and heels land. The cover feels cool to the touch the moment you set a hand on it.
Who it's for, and who it's not, said straight
This is built for back and stomach sleepers. On your back, the firm coil support holds your spine level; on your stomach, the firm feel keeps your hips from sagging and your lower back from arching over a night. And if you run warm on a firm bed, the Micro Diamond™ cooling targets exactly the heat a firm surface tends to hold.
- Side sleepers: a 7/10 firm will press on your shoulder; a medium or plush Black is the better fit.
- If you want the most accessible firm Black, the Series Two Firm delivers firm support a tier down.
- If you want the firmest possible feel, the Series Three Extra Firm goes harder, closer to an 8/10 with less give than this Firm.
Living with it over time
The partner factor is what you feel most over the years: those Triple-Stranded Pocketed Coils move independently, so when the person next to you rolls over or gets up, the motion barely crosses to your side. The pocketed-coil core also breathes more than all-foam, so the cooling has airflow to work with rather than trapped heat. And if you use an adjustable base, this mattress is built to flex with one.
Why buy it from Mattress Overstock
Locally owned and serving Kentucky since 2012, with five showrooms you can actually walk into, in Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. This is a bed you can come lie on in person before you commit, not just a picture on a screen, and no appointment is needed.
Whether an upper-tier firm sleeps cool and supportive, or just hard, is a lying-down question. Come feel the Series Three Firm beside the Series Two at any of the five Kentucky showrooms, and the team can walk you through the tiers side by side. You get a 100-day comfort guarantee; if it's 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. Free local delivery, free setup, and the team hauls your old mattress away. And no one on the floor earns more for steering you up a tier, so the guidance is honest. Select your size to see the live Mattress Overstock price.
Compare the firm tiers in the full Beautyrest Black lineup.
What makes this mattress different
Upper-tier firm, about a 7 out of 10
Firm coil support that keeps your hips lifted and your spine level for back and stomach sleepers, without the dead-board hardness of an extra-firm bed.
Self-Response™ Latex over the support
The Series Three layer a basic firm bed skips: a responsive latex layer that pushes back quickly and adds airflow, so the surface gives a little without going soft.
SurfaceTouch™ Gel quilted into the surface
Gel memory foam quilted right into the top takes the bare edge off where your shoulders and heels land, the moment you lie down.
Micro Diamond™ cooling + cool-to-the-touch cover
The Series Three cooling upgrade pulls heat off the surface, which matters on a firm bed that sits you close to the materials.
Triple-Stranded Pocketed Coil® core, 15 inches
A firm-tuned coil core for level support and Beautyrest's most advanced motion separation, so a partner's movement barely crosses to your side.
Built for an adjustable base
The hybrid build flexes with an adjustable base, so you can raise your head or feet without fighting the mattress.
CertiPUR-US foams, 10-year warranty
Foams made without formaldehyde, prohibited phthalates, or heavy metals, backed by Beautyrest's 10-year limited warranty. Measure 15 inches against your frame and deep-pocket sheets before you buy.
Firm support, layer by layer, with Series Three comfort and cooling
The Series Three Firm keeps its comfort layers measured so you sleep firmly on top of the support, not buried in it. Here is the build from the surface down:
- Cool-to-the-touch cover. You feel it the second you set a hand on the bed, the first stage of the Series Three cooling.
- SurfaceTouch™ Gel memory foam. Quilted directly into the surface for immediate pressure relief where your shoulders and heels land.
- Self-Response™ Latex. The Series Three upgrade a basic firm bed leaves out: a responsive, ventilated latex layer that springs back quickly and keeps air moving instead of trapping heat.
- Micro Diamond™ memory foam. Draws heat away from the body, the cooling layer that lets a firm surface stay cool.
- Triple-Stranded Pocketed Coil® core, firm-tuned, 15 inches. Hundreds of independently moving coils hold your spine level and deliver Beautyrest's most advanced motion separation. Because it is a coil core, it breathes far more than an all-foam bed, giving the cooling layers airflow to work with.
For firm support a tier down, see the Series Two Firm. For the firmest Series Three, the Extra Firm at about an 8 out of 10. Compare every firm option 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 get the clearest payoff: the firm coil support holds your spine level and your hips up, with more responsive comfort and cooling than a plain firm bed.
Stomach sleepers stay aligned through the night, because the firm feel keeps your hips from sagging and your lower back from arching into the mattress.
Heavier or taller sleepers who have bottomed out softer beds tend to do well here: the firm-tuned Triple-Stranded Pocketed Coil® core keeps strong, even support across the surface.
Couples and light sleepers feel the difference most over the years. Those independently moving coils deliver Beautyrest's most advanced motion separation, so a partner rolling over or getting up barely reaches your side.
Firm-bed sleepers who run warm get the Series Three cooling: Micro Diamond™ foam and a cool-to-the-touch cover target exactly the heat a firm surface tends to hold, with a coil core breathing underneath.
Probably not for you if you sleep on your side, where a 7 out of 10 firm will press on your shoulder and a medium or plush Black suits better, or if you want the hardest possible feel, where the Extra Firm goes further.
Specifications
| Height | 15" |
|---|---|
| Feel | Firm |
| Firmness | 7 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: 15 inches, 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 15" Firm?
About a 7 out of 10, where 10 is firmest: genuinely firm and supportive so you sleep on top of the bed, with Series Three latex, gel, and Micro Diamond™ cooling so it does not read as hard or sleep hot.
How is it different from the Series Three Extra Firm?
The Series Three Extra Firm is about an 8 out of 10, firmer with less give. This Firm (7 out of 10) keeps strong support but adds a touch more responsive comfort on top. If you are between them, lie on both side by side in a showroom.
What makes Series Three different from Series Two?
Series Three carries everything in Series Two and adds Self-Response™ Latex, a responsive, ventilated layer for more pressure relief and airflow. For firm support one tier down, see the Series Two Firm.
Is it a hybrid?
Yes. Self-Response™ Latex, SurfaceTouch™ Gel, and Micro Diamond™ memory foam sit over a firm-tuned Triple-Stranded Pocketed Coil® support core, 15 inches in all.
Does a firm mattress sleep hot?
A firm surface sits you closer to the materials, so heat is a fair question. This one answers it with the Series Three cooling: Micro Diamond™ foam and a cool-to-the-touch cover pull heat off the surface, and the pocketed-coil core breathes far more than all-foam, giving that cooling real airflow to work with. It is built for back and stomach sleepers; side sleepers usually want a medium or plush Black instead.
How does it handle motion from a partner?
Very well. The Triple-Stranded Pocketed Coils move independently, Beautyrest's most advanced motion separation, so when the person next to you rolls over or climbs out of bed, the movement barely crosses to your side.
Does it work with an adjustable base?
Yes. The hybrid build is made to flex with an adjustable base, so you can raise your head or feet without the mattress fighting back. Ask the floor about pairing it with a base when you visit.
What warranty and certifications does it carry?
A 10-year limited warranty from Beautyrest, with CertiPUR-US certified foams (made without formaldehyde, prohibited phthalates, or heavy metals). Worth measuring the 15-inch height against your frame and deep-pocket sheets before it arrives.
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, set it up, and haul the old mattress away. You also get a 100-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, and no restocking-fee games).
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, no appointment needed. Because everyone on the 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.
