Beautyrest
Beautyrest Black® Series Four 16.75" Plush Apex Top Hybrid Mattress
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The honest verdict: the Series Four Plush Apex Top Hybrid is the soft Beautyrest Black built so the softness never costs you the edges. At about a 3 out of 10 it gives side sleepers a deep, sink-in cradle, but the Apex Top reinforces the perimeter, so the full width stays usable and you don't roll toward the middle, the exact failure that ruins most soft beds. If you want plush comfort and you sleep, sit, or share right out to the side, this is the Black to try first.
What it's made of, and what that does for you
This is a hybrid, not an all-foam bed. Series Four carries everything the lower Black tiers do, then adds 4K Micro Coils and extra HD Memory Foam for its most premium support and a taller build, with the Apex Top holding the sides.
- A deep plush feel, about 3/10. A soft, sink-in surface that lets your shoulder and hip settle in instead of bracing against the bed.
- Apex Top edge support. A reinforced perimeter that keeps a soft bed usable to the edge, so the side holds when you sit to put your shoes on and the full width still sleeps when you roll out toward it.
- 4K Micro Coils + HD Memory Foam. Series Four's most premium individualized support under the plush, so the soft top stays held up instead of bottoming out.
- Triple-Stranded Pocketed Coil® core. Coils that move independently for lasting support and Beautyrest's most advanced motion separation, so a restless partner barely registers on your side.
- Sleep Climate™ cooling, Micro Diamond™ foam. A cool-to-the-touch surface plus diamond-infused foam that pulls heat off the top, over coils that breathe more than a solid foam block.
- A 16.75-inch flagship hybrid, 10-year warranty. Substantial, quilted, with carry handles on the base for shifting. Plan for deep-pocket sheets.
What you notice in the first few minutes
Lie down on your side and the surface gives way under your shoulder and hip, easing the pressure a firmer bed puts on those points. You don't feel stuck at the bottom of the bed, though, because the 4K Micro Coils and the pocketed-coil core hold your spine level under the softness. That is the thing a soft all-foam bed can't reliably give you.
Then sit on the edge and notice what doesn't happen. On most soft beds the perimeter collapses and the outer few inches go unusable; the Apex Top is built to fix exactly that, so the side holds when you sit and the full width still sleeps when you roll toward it. Share the bed and those firm edges hold on both sides, while the independent pocketed coils keep a partner's movement from crossing over.
Who it's not for, said straight
- Back and stomach sleepers. At 3/10 your hips will likely dip; the Series Four Medium Pillow Top (5/10) or the Firm Apex Top Hybrid (6/10) is the better fit.
- If you want the tallest, deepest plush. The Series Four Plush Pillow Top (17.25") stacks a deeper cushioned top.
- If you want a responsive, on-top feel. This is a soft, settle-in surface, and it won't become a bouncy one.
Where it sits in the Series Four lineup
Series Four is one support stack tuned to different feels. Like this plush build but want more push-back under the edges? The Firm Apex Top Hybrid is its firm twin at the same 16.75-inch height. Want the softness piled deeper? The Plush Pillow Top stacks a taller cushioned top at 17.25 inches. Coming off a soft all-foam bed that sagged at the sides or let your spine round, this version keeps the plush feel and adds back the support and edges you were missing.
Why buy it from Mattress Overstock
Locally owned and serving Kentucky since 2012, with five showrooms you can walk into: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Edge support on a soft bed is something you only believe once you've sat and lain near the side, exactly what a showroom is for, no appointment needed. Come lie on the Plush Apex Top in your own sleeping position, and the floor can set the Firm Apex Top right beside it so you feel the fork in a single minute.
Select your size above for the live Mattress Overstock price. You 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 old-mattress haul-away. And no one on the floor earns more for steering you to the top of the line, so the guidance is honest. Browse the Beautyrest Black lineup, then come lie down: a minute on your side tells you more than this whole page can.
What makes this mattress different
Plush feel, strong edges
A soft 3-out-of-10 cradle with a reinforced Apex Top that keeps the perimeter firm: deep softness without rolling to the middle.
Apex Top edge support
The full sleeping surface stays usable and the side holds when you sit, the exact spot most soft beds give out.
4K Micro Coils + HD Memory Foam
Series Four's most premium individualized support under the plush, so the soft top stays held up instead of bottoming out.
Triple-Stranded Pocketed Coil® core
Independently moving coils for lasting support and Beautyrest's most advanced motion separation: a restless partner barely registers.
Sleep Climate™ cooling + Micro Diamond™ foam
A cool-to-the-touch surface and diamond-infused foam pull heat off the top, over coils that breathe more than solid foam.
Built up from the full Black stack
Carries everything the lower Black tiers do, then adds the 4K coils and extra HD foam for a taller, more luxurious build.
16.75-inch flagship hybrid, 10-year warranty
Substantial and quilted with carry handles on the base for shifting; plan for deep-pocket sheets.
A soft bed that keeps its edges
The Series Four Plush Apex Top Hybrid is built in layers, soft on top and supportive underneath, so the plush never turns into sagging.
- Sleep Climate™ surface. A cool-to-the-touch quilted cover that starts the heat-management job at the layer closest to you.
- Plush comfort foams, including Micro Diamond™ Memory Foam. The deep 3/10 cradle, with diamond-infused foam engineered to draw heat away from the body.
- HD Memory Foam. Higher-density foam that keeps the soft top supported rather than letting you bottom out.
- 4K Micro Coils. Series Four's most premium layer of individualized support, responding point by point beneath the plush.
- Triple-Stranded Pocketed Coil® core. The support engine: coils that move independently for lasting support and Beautyrest's most advanced motion separation.
- Apex Top edge construction. A reinforced perimeter wrapping the whole bed so a soft mattress stays usable to the edge.
The 4K Micro Coils and HD foam hold the plush up; the Apex Top fixes the soft-bed edge problem; the pocketed-coil core does the deep support and the motion isolation. For the tallest, deepest plush, see the Series Four Plush Pillow Top; for the same build tuned firmer, the Firm Apex Top Hybrid. 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.
Plush for side sleepers who use the whole bed
Side sleepers: the clearest fit. A deep 3/10 cradle lets your shoulder and hip settle while the 4K coils keep your spine level, so you sink in without rounding out of alignment.
Edge-sitters and people who use the full mattress: the Apex Top keeps the perimeter firm, so you can sit on the side or sleep right out to it without that soft-bed roll-off.
Couples: independent pocketed coils give Beautyrest's most advanced motion separation, so a partner getting in late barely reaches your side, and the firm edges hold for both of you.
Anyone leaving a soft all-foam bed that sagged: this keeps the plush feel you liked but adds back real coil support and edges, fixing the part the foam bed got wrong.
Combination sleepers who mostly side-sleep: workable if your nights start and end on your side, but the soft surface won't push back when you roll to your back, so try it in your real mix of positions first.
Probably not for you if: you sleep on your back or stomach (the hips will dip, look at the Medium Pillow Top or Firm Apex Top), you want a firm on-top feel, or you want the tallest plush (the Plush Pillow Top).
Specifications
| Height | 16.75" |
|---|---|
| Feel | Plush Apex Top Hybrid |
| Firmness | 3 out of 10 (10 = firmest) |
| Construction | Plush comfort layers with 4K Micro Coils, HD Memory Foam and Micro Diamond™ foam over a Triple-Stranded Pocketed Coil® core, with Apex Top edge support: 16.75 inches, plush. |
| 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
How soft is the Series Four Plush Apex Top, really?
About a 3 out of 10, a genuinely soft, sink-in feel for side sleepers. The difference from a cheap soft bed is what's underneath: 4K Micro Coils and a pocketed-coil core hold your spine level so the softness doesn't turn into sagging.
What is the Apex Top?
A reinforced edge construction that keeps the perimeter of the mattress firm, so even a soft bed sleeps usable to the edge and holds when you sit. On Series Four the Apex Top design runs across the line; on this model it's named because the soft-but-strong-edges combination is the whole point.
Will a soft bed still support my back?
Yes. The 4K Micro Coils and the Triple-Stranded Pocketed Coil® core hold your spine level under the plush surface, which a soft all-foam bed can't reliably do. That coil support is exactly why this sinks in without letting your hips drop out of alignment.
Is it memory foam or a hybrid?
A hybrid. Plush comfort foams, including HD Memory Foam and cooling Micro Diamond™ foam, sit over 4K Micro Coils and a Triple-Stranded Pocketed Coil® core. You get the cradle of foam with the support, airflow, and edges of coils.
Does it sleep hot?
It's built to run cool for a plush bed: a Sleep Climate™ cool-to-the-touch surface and diamond-infused Micro Diamond™ foam pull heat off the top, and the coil core breathes more than a solid foam block. Worth knowing in general: a soft, deeply cushioned top breathes a little less than a firm one, so if extreme heat is your single biggest issue, ask the floor to compare it against a firmer hybrid.
Does it have fiberglass?
No. This is a premium Beautyrest Black hybrid with CertiPUR-US® certified foams, not a budget bed-in-a-box that relies on a fiberglass fire sock. You don't need to worry about the fiberglass problem you may have read about on cheaper mattresses.
How is it different from the Series Four Plush Pillow Top and the Firm Apex Top?
All three are Series Four, the same support family tuned differently. The Plush Pillow Top (17.25") stacks a taller, deeper cushioned top; this Apex Top Hybrid (16.75") foregrounds the edge support; and the Firm Apex Top Hybrid (6/10) is this exact build tuned firm for back and stomach sleepers. Feel them side by side to choose.
Do I need a special base, and will it fit my frame?
It works on a sturdy flat foundation, a platform bed, or an adjustable base; the pocketed coils flex on an adjustable without complaint. It stands about 16.75 inches tall, so measure that against your frame and bed height, and buy deep-pocket sheets. The floor in any showroom can tell you what pairs well with it.
Can I see this mattress in person near me?
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, and sit on the edge to feel the Apex Top, before you decide.
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, with free setup and old-mattress haul-away. 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 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.
