Beautyrest
Beautyrest Black® Series Four 17.25" Plush Pillow Top Mattress
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The honest verdict: the Series Four Plush Pillow Top is the flagship plush of Beautyrest Black, the deepest, best-supported cloud the brand makes. On a luxurious 17.25-inch build it sits at about a 3 out of 10, pairing a deep cushioned top with the three things only Series Four adds: 4K Micro Coils for the finest support under all that softness, an Apex Top edge on every model, and extra HD Memory Foam. If you sleep on your side and want to sink in deep without waking up sore, this is the top of the ladder, and it's worth ten real minutes on your back before you commit.
What you notice in the first few minutes
Lie down on your side and the surface gives the way a deep plush should: your shoulder and hip settle in rather than perch on top, and the pressure points that ache on a firmer bed ease off. What sets it apart from a soft all-foam bed is what happens under that first sink. Instead of giving until your hips drop below your spine, the 4K Micro Coils catch you and support the cushion point by point. You get the falling-in feel without the hammock sag that aches by morning.
What it's made of, and what that does for you
- A deep plush pillow top. The most cushioned surface in the Black line; your shoulder and hip sink into a genuine cloud.
- 4K Micro Coils. The finest coil layer Black builds, so the deep plush is supported point by point instead of just giving way. The Series Three plush uses 2K; this is the step up.
- Apex Top edge support. Standard on every Series Four model, so the perimeter holds firm when you sit on the side or sleep near it.
- Extra HD Memory Foam. Added high-density foam for the deepest pressure relief in the line, and part of why this build runs tall.
- A breathable core. Self-Response Latex and Micro Diamond foam over a Triple-Stranded Pocketed Coil core: the latex keeps the plush responsive, the cool-to-the-touch cover and diamond foam pull heat off the surface, and the coils move independently so a partner getting up barely crosses to your side. It works on an adjustable base, too.
- A 17.25-inch flagship build, 10-year warranty. Among the tallest carried here, with CertiPUR-US certified foams. Plan for deep-pocket sheets and check frame height.
Who it's not for, and it's better to say so now
- Back and stomach sleepers. A 3 out of 10 will likely let your hips dip; a medium or firm Black is the better fit.
- If you want the same plush for less. The Series Three Plush Pillow Top has 2K coils, a tier down.
- If a very tall bed is a problem. At 17.25 inches plus a foundation this sits high; measure first.
How it compares within Beautyrest Black
Series Four tops the plush ladder because it includes everything from Series One through Three and adds the 4K Micro Coils, the Apex Top edge on every model, and extra HD Memory Foam. Whether those 4K coils make a deep plush feel meaningfully better supported than the 2K tier below is the kind of difference your own back confirms lying down. Coming off a sagging older bed or a basic all-foam mattress, the change you notice most is a deep cushion that still holds your spine level.
Why buy it from Mattress Overstock
An independent Kentucky retailer since 2012, with five showrooms you can walk into, in Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond, no appointment needed. A deep plush is exactly the kind of feel worth confirming with your own body before you commit. Come sink into it, beside the Series Three plush, and the team can walk you through whether the 4K coils earn the step up for how you sleep. Across five showrooms the floor holds about 4.7 stars from more than 535 Google reviews.
Select your size to see the live Mattress Overstock price. You get free local delivery, free setup, and the old mattress hauled away across the Kentucky service area, usually next business day when your size is in stock. There's 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 no restocking-fee games). And because everyone on the floor is paid the same no matter the brand, the guidance you get is honest, never pushed toward the top of the line.
Feel the flagship plush against the rest of the Beautyrest Black lineup, then lie on it in Lexington this week.
What makes this mattress different
The flagship deep plush
The deepest, most cushioned surface Black makes: a genuine cloud built for side sleepers.
4K Micro Coils under the cushion
The finest coil layer Black builds supports the deep plush point by point, so it sinks in without giving way. The Series Three plush uses 2K.
Apex Top edge support
Standard on every Series Four model, so the perimeter holds firm when you sit on the side or sleep near it.
Extra HD Memory Foam
Added high-density foam for the deepest pressure relief in the line, and part of why this build runs tall.
Sleeps cooler than it looks
A cool-to-the-touch cover and Micro Diamond foam pull heat off the surface, over a coil core that breathes more than all-foam.
Steady for two
A Triple-Stranded Pocketed Coil core moves point by point, so a partner getting up barely crosses to your side.
Luxurious 17.25-inch build, 10-year warranty
Among the tallest carried here, with CertiPUR-US certified foams. Plan for deep-pocket sheets and check frame height.
The flagship cloud, fully supported
The Series Four Plush Pillow Top is built top down for one job: a deep, sink-in plush that still holds your spine level. Here is the stack, from the surface to the core.
- A deep plush pillow top quilted for an immediate, cushioned sink, the softest surface in the Black line.
- 4K Micro Coils inside that top: the finest coil layer Black builds, so the cushion is supported point by point instead of bottoming out. The Series Three plush uses 2K coils here.
- HD Memory Foam and Self-Response Latex for the deepest pressure relief in the line, with latex keeping the plush responsive rather than dead-soft.
- Micro Diamond memory foam and a cool-to-the-touch cover to pull heat off the surface a deep cushion would otherwise trap.
- A Triple-Stranded Pocketed Coil core for the structural support and the motion separation that lets two people sleep without crossing each other.
- An Apex Top edge, standard on every Series Four model, reinforcing the perimeter for sitting and edge sleeping.
The 4K coils are the headline: they are why a cloud-soft surface still supports your spine precisely. For the same plush with 2K coils a tier down, see the Series Three Plush Pillow Top, or compare 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.
The flagship cloud for side sleepers
Side sleepers: the deepest cushion in the line gives your shoulder and hip a place to sink, while the 4K Micro Coils keep your spine supported under it. This is the bed this model exists for.
Plush seekers who want the best: if you have decided you want soft and you want it done right, this is the most refined, best-supported plush Beautyrest Black makes.
Couples where one wants soft: the Apex edges and pocketed coils let a plush sleeper have their cloud while the other side stays supported and undisturbed.
Anyone coming off a sagging older bed: the change you feel first is a deep cushion that still holds your back level, instead of the hammock dip a worn mattress or basic all-foam bed gives.
Heavier side sleepers who run warm: the deep plush and Micro Diamond cooling suit a heavier frame, and the coil core breathes more than all-foam. If heat is your number-one issue, a firmer hybrid will still sleep cooler.
Probably not for you if: you sleep on your back or stomach (your hips will likely dip; choose a medium or firm Black), you want the same plush for less (the Series Three Plush Pillow Top), or a very tall bed is a problem for your frame.
Specifications
| Height | 17.25" |
|---|---|
| Feel | Plush Pillow Top |
| Firmness | 3 out of 10 (10 = firmest) |
| Construction | Deep plush pillow top with 4K Micro Coils, HD Memory Foam, Self-Response™ Latex and Micro Diamond™ foam over a Triple-Stranded Pocketed Coil® core, with Apex Top edge support: 17.25 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
What makes Series Four the flagship?
Series Four is the most premium tier of Beautyrest Black. It includes everything from Series One through Three, then adds three things: 4K Micro Coils for the most individualized support Black builds, an Apex Top edge on every model, and extra HD Memory Foam for the deepest pressure relief and a luxurious height.
How soft is the Plush Pillow Top, really?
It is a deep plush, about a 3 out of 10 where 10 is firmest, and the most cushioned surface in the entire Black line. You sink into the pillow top, while the 4K Micro Coils and the coil core keep that softness supported.
Will such a soft, tall bed support my back?
Yes, that is exactly what the 4K Micro Coils and the Triple-Stranded Pocketed Coil core are for. They hold your spine level under the deep cushion, which a soft all-foam bed cannot reliably do. It is the case for a supported plush hybrid over plush foam.
How is it different from the Series Three plush?
Three upgrades: 4K Micro Coils instead of 2K, an Apex Top edge, and added HD Memory Foam. The Series Three Plush Pillow Top is the same deep-plush idea one tier below, and the difference is one your own back confirms lying down.
Is this a good mattress for side sleepers?
It is one of the best side-sleeper beds in the Black line. The deep cushion lets your shoulder and hip settle in to relieve pressure, and the 4K Micro Coils keep your spine aligned so you do not wake up sore.
Does it sleep hot?
A deep cushion can trap heat, which is why this build uses a cool-to-the-touch cover and Micro Diamond memory foam to move heat off the surface, over a pocketed-coil core that breathes more than all-foam. If sleeping cool is your single biggest priority, a firmer hybrid will still run cooler than any deep plush.
How tall is it, and do I need special sheets?
It is a 17.25-inch build, among the tallest carried here. Plan on deep-pocket sheets, and measure your frame and foundation so the finished height suits getting in and out of bed.
Is it good for couples and motion transfer?
Yes. The Triple-Stranded Pocketed Coil core moves point by point, so when one person gets up or rolls over, the motion barely crosses to the other side. The Apex Top edge also makes the full width of the bed usable.
How do delivery and the comfort guarantee work?
We deliver across Kentucky with our own team, usually the next business day when your size is in stock, and we 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).
Can I see this mattress in person near me?
Yes, and with a mattress this plush 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, beside the Series Three plush, before you decide. We deliver free across our Kentucky service area and haul your old mattress away, 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.
