Beautyrest
Beautyrest Black® Series Four 16.75" Firm Apex Top Hybrid Mattress
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The honest verdict: the Series Four Firm Apex Top Hybrid is the top of Beautyrest Black built for people who sleep on their back or stomach and want genuinely firm support that still cradles. At about a 6 out of 10 it holds your spine level and keeps your hips from dropping, while the named Apex Top, three added inches of GelFeel Firm HD memory foam over a high-density foam encasement, keeps the perimeter solid so the full width sleeps usable and the side holds when you sit. With 4K Micro Coils and Self-Response latex layered over a firm-tuned Triple-Stranded Pocketed Coil core, this is firm done with the most hardware Black puts in a bed.
Firm support that still contours
This is a firm bed, not a hard one. Beautyrest tunes the Firm Apex Top as a deeply contouring, responsive surface with firmer, conforming support: a 6 out of 10 that lands on the supportive side of center, so your hips stay up and your spine runs straight while the surface still cradles. The contouring is the part inexpensive firm beds get wrong. ContourFit nestles you into FORM HD Material, a high-density foam that cradles your curves, while Self-Response latex underneath answers each movement instead of sagging. Firm here means supported, not stiff.
What the Apex Top actually does
Most firm mattresses give you a strong middle and an edge that rolls away the moment you sit. The Apex Top fixes that. It stacks three additional inches of GelFeel Firm HD memory foam across the surface and wraps the whole bed in a high-density foam encasement, so the edge stays firm and the sleeping area runs corner to corner. Sit on the side to put on your shoes and it holds; roll to the edge in your sleep and you do not feel the drop-off. On a bed shared by two, that reclaimed perimeter is real sleeping space, not a soft border you both avoid.
Underneath: the coils and the cooling
Support starts with the 4K Micro Coils, the highest coil count Black builds into a bed, sitting over a firm-tuned Triple-Stranded Pocketed Coil core. Instead of one broad push back, the surface answers in small increments, so support tracks your back and hips closely. The pocketed coils also move on their own, so a restless partner barely registers on your side of the bed.
Heat is managed at the surface and in the build. The cool-to-the-touch Sleep Climate Surface pairs with Micro Diamond memory foam, infused with diamond particles to pull warmth off the body, and as a hybrid the coils breathe far more than any all-foam bed. A cool cover helps most in the first minutes, but a firm hybrid surface breathes better than a soft one, so this build sits on the right side of that trade.
Living with it
At 16.75 inches this is a substantial flagship hybrid, so measure your frame and buy deep-pocket sheets before it arrives. It pairs with an adjustable base, carries a 10-year limited manufacturer's warranty, and is built with CertiPUR-US certified foams.
Who it suits, and who it does not
This is a back and stomach sleeper's bed first. Honestly, it is not for everyone:
- Side sleepers. A firm 6 out of 10 will be more than your shoulder wants on your side. The Series Four Plush Apex Top gives the same edge support with a soft cradle.
- If you want firm with a taller cushioned top. The Series Four Firm Pillow Top (17.5 inches) is also flagship firm but adds a deeper pillow top instead of foregrounding the edge.
- If you want firm for less. The Series Three firm models are a tier down from this flagship hardware.
Why buy it from Mattress Overstock
Independent and serving Kentucky since 2012, with five showrooms you can walk into, in Lexington on Nicholasville Road, Georgetown, Somerset, London, and Richmond, rated about 4.7 stars across more than 500 Google reviews. Firm support and edge strength are both things your own body has to confirm, so come lie on this exact bed in your real sleeping position, no appointment needed, and the team can set it beside the Firm Pillow Top and the Plush Apex Top so you feel the difference in one trip.
You get a 100-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. Free local delivery, free setup, and the team hauls your old mattress away, usually next business day when your size is in stock. Because everyone on the floor is paid the same no matter which brand you choose, the guidance is honest. Lie on the Firm Apex Top in a Kentucky showroom this week, or see the full Beautyrest Black lineup to compare firmness levels.
What makes this mattress different
Firm feel that still contours (6/10)
A genuinely firm 6 out of 10 tuned as a deeply contouring, responsive surface, so back and stomach sleepers get conforming support, not a hard slab.
Apex Top: 3 inches of GelFeel Firm HD foam
The named Apex Top adds three inches of GelFeel Firm HD memory foam across the surface for upgraded, edge-to-edge pressure relief.
High-density edge encasement
A high-density foam encasement wraps the bed so the perimeter stays firm, the full width sleeps usable, and the side holds when you sit.
4K Micro Coils, the most Black builds
The highest coil count in Beautyrest Black sits over a firm-tuned Triple-Stranded Pocketed Coil core for precise, individualized support.
Self-Response latex + ContourFit design
Self-Response latex answers each movement while ContourFit nestles you into FORM HD Material, so the firm surface cradles instead of sagging.
Sleep Climate Surface with Micro Diamond foam
A cool-to-the-touch cover paired with diamond-infused Micro Diamond memory foam pulls heat off the body, over coils that breathe far more than all-foam.
Strong motion separation
The pocketed coils move independently, so a partner's tossing and turning barely crosses to your side of the bed.
16.75-inch flagship hybrid, 10-year warranty
A substantial top-tier hybrid with CertiPUR-US certified foams and a 10-year limited warranty. Plan for deep-pocket sheets.
Flagship firm support, layer by layer
The Series Four Firm Apex Top Hybrid is the top of the Beautyrest Black ladder, and the build shows it. Here is what sits between you and the floor.
The Apex Top. Three additional inches of GelFeel Firm HD memory foam run across the surface for upgraded, edge-to-edge pressure relief, while a high-density foam encasement wraps the whole bed so the perimeter stays firm and the side holds when you sit.
The contouring layers. Beautyrest's patented ContourFit design nestles you into FORM HD Material, a high-density foam engineered to cradle your curves with stronger airflow than a solid foam slab, and Self-Response latex underneath answers each movement for responsive pressure relief.
The cooling. A cool-to-the-touch Sleep Climate Surface works with Micro Diamond memory foam, infused with diamond particles to draw heat away from the body.
The support core. 4K Micro Coils, the highest coil count Black builds, sit over a firm-tuned Triple-Stranded Pocketed Coil core, so support tracks your back and hips point by point and a partner's movement stays on their side.
For firm with a taller cushioned top instead, the Series Four Firm Pillow Top. For the same Apex Top edge in a soft feel, the Plush Apex Top. See the whole ladder 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.
Flagship firm for back and stomach sleepers
Back sleepers. This is the heart of the bed. The firm 4K Micro Coil support holds your spine level while the GelFeel Firm HD foam contours just enough to keep your lower back from arching. Beautyrest itself calls the Firm Apex Top great for back sleepers.
Stomach sleepers. The firm, conforming support keeps your hips from sinking and your midsection from bowing, the usual cause of a sore lower back on a soft bed.
Couples. Two wins here: the pocketed coils keep one person's movement from waking the other, and the high-density edge encasement reclaims the perimeter, so the full width is real sleeping space instead of a soft border you both avoid.
Edge-sitters and anyone with mobility needs. The Apex Top holds its shape when you sit on the side to dress or get in and out of bed, so the edge does not roll away under you.
Hot sleepers who run warm but not scorching. The Sleep Climate Surface, Micro Diamond foam, and breathable hybrid coils put this firm build on the cooler side, though a cool cover helps most in the first minutes rather than all night.
Probably not for you if you sleep on your side (try the Plush Apex Top), or you want firm with a taller cushioned top (the Firm Pillow Top).
Specifications
| Height | 16.75" |
|---|---|
| Feel | Firm Apex Top Hybrid |
| Firmness | 6 out of 10 (10 = firmest) |
| Construction | Firm comfort layers with 4K Micro Coils, HD Memory Foam and Micro Diamond™ foam over a firm-tuned Triple-Stranded Pocketed Coil® core, with Apex Top edge support: 16.75 inches, firm. |
| Cooling | Cool-to-the-touch cover with Micro Diamond™ memory foam pull heat off the surface, over a coil system that breathes more than all-foam. |
| Motion isolation | Excellent: 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
What is the Apex Top?
It is the named edge and surface construction on Series Four. It adds three additional inches of GelFeel Firm HD memory foam across the top for upgraded, edge-to-edge pressure relief, and wraps the bed in a high-density foam encasement so the perimeter stays firm. The result is that the full sleeping surface stays usable and the side holds when you sit. Every Series Four model is an Apex Top design.
How firm is it?
About a 6 out of 10, on the supportive side of center. Beautyrest tunes the Firm Apex Top as a deeply contouring, responsive surface with firmer, conforming support, so it is firm but not hard: your spine stays level while the memory foam and latex still cradle.
Is it good for back and stomach sleepers?
Yes. Beautyrest calls the Firm Apex Top great for back and stomach sleepers, and that matches the feel: the firm 4K Micro Coil support keeps a back sleeper's spine level and stops a stomach sleeper's hips from sagging. Side sleepers usually want something softer, like the Plush Apex Top.
What is it made of?
From the top down: a three-inch GelFeel Firm HD memory foam Apex Top with a high-density foam encasement, ContourFit FORM HD Material and Self-Response latex for contouring and responsive pressure relief, a cool-to-the-touch Sleep Climate Surface with Micro Diamond memory foam for cooling, and 4K Micro Coils over a firm-tuned Triple-Stranded Pocketed Coil core for support. It stands 16.75 inches tall.
Will it sleep cool?
It is built to sleep cooler than an all-foam bed. The cool-to-the-touch Sleep Climate Surface and diamond-infused Micro Diamond memory foam draw heat off the body, the FORM HD Material is engineered for stronger airflow, and the coil system breathes. Be realistic: a cool cover helps most in the first few minutes, and a firm hybrid surface breathes better than a soft one, so this firm build is on the right side of that trade.
How is it different from the Series Four Plush Apex Top?
Same flagship hardware and the same Apex Top edge support, opposite feel. This Firm Apex Top is about a 6 out of 10 for back and stomach sleepers; the Plush Apex Top is a soft cradle for side sleepers. If you share the bed with someone who sleeps differently, feel both side by side.
How is it different from the Series Four Firm Pillow Top?
Both are flagship firm. The Firm Pillow Top (17.5 inches) adds a taller, deeper cushioned top; this Apex Top Hybrid (16.75 inches) foregrounds the edge support and a firmer, more on-top feel. Lie on both to choose.
Does it work with an adjustable base, and what about the warranty?
Yes, it pairs with an adjustable base. It carries a 10-year limited manufacturer's warranty and is built with CertiPUR-US certified foams. At 16.75 inches it is a tall hybrid, so measure your frame and use deep-pocket sheets.
How do delivery and the comfort guarantee work?
Mattress Overstock delivers across Kentucky with its own team, usually next business day when your size is in stock, with free setup and old-mattress haul-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).
Can I see this mattress in person near me?
Yes, and with a flagship mattress like this one, lying on it first is the whole point. Mattress Overstock is a Kentucky business that has served the state since 2012, rated about 4.7 stars across more than 500 Google reviews, 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, and ask the floor to set it beside the Firm Pillow Top and the Plush Apex Top. Everyone on the floor is paid the same no matter which brand you choose, so the guidance 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.
