Beautyrest
Beautyrest Black® Series Four 17.5" Firm Pillow Top Mattress
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The honest verdict: the Series Four Firm Pillow Top is firm support done at the top of the Black line. At about a 6 out of 10 it gives back sleepers genuinely firm support while a cushioned pillow top softens the surface, and it carries the Series Four flagship hardware: 4K Micro Coils for the finest individualized support, an Apex Top for reinforced edges, and added HD Memory Foam. Firm but not hard, the most precise support Beautyrest Black builds. If firm has felt like a flat board to you before, this is the version that fixes that.
What it is, and the honest feel
This is a firm bed given a soft hello. A firm-tuned Triple-Stranded Pocketed Coil core does the structural work, and the 4K Micro Coil layer, the finest coil Black builds, sits on top of it. Instead of the uniform hardness of a typical firm bed, the 4K coils break the surface into thousands of responding points, so the support tracks your body rather than pushing back as one flat plane. The cushioned pillow top, layered with HD Memory Foam, Self-Response Latex and Micro Diamond foam, keeps the surface from reading as hard.
Lie on your back and your hips do not sink while your lower back never arches into open air: the coils hold your spine level, and the pillow top eases pressure off your shoulder blades so the firmness underneath never feels like a plank. The cover reads cool to the touch, with Micro Diamond foam over a coil core that breathes far more than all-foam can.
Who it suits, and honestly who it does not
This bed is built for back sleepers who want firm, level support without giving up a comfortable surface. Combination sleepers who lean firm fit it well too: supportive for back and stomach, with enough surface give to roll to your side. Couples do well here, between the independently moving pocketed coils and the reinforced Apex edges. Heavier sleepers who have flattened softer beds get real, lasting pushback from the firm coil core.
The Mattress Overstock team would rather tell you now where it is the wrong call. If you want a true rock-firm surface, the pillow top adds give by design, and an extra-firm model is the more honest pick. If you are a dedicated side sleeper, a 6 out of 10 may leave your shoulder wanting more room, and a plush model gives the deeper cradle. Either way, the floor will point you to it rather than talk you into this one.
How it compares within the Black lineup
The cleanest comparison is to its own sibling. The Series Three Firm Pillow Top sits one tier below and delivers the same firm-with-cushion idea on 2K coils. The Series Four steps up to 4K Micro Coils, an Apex Top edge, and added HD Memory Foam on top of what the lower series do. Both feel firm; the Series Four feels more precise, because doubling the coil count lets the support read your body more finely. If you like the build but want more give underfoot, the same-series Series Four Medium Pillow Top is the softer step. Which one is right is a lying-down question, so feel them back to back.
Living with it over time
What wears on couples is motion and edges, and this build handles both: the pocketed coils move independently, so a partner shifting barely crosses the bed, and the Apex edges keep the perimeter from sloping off, so the full width stays usable for years. It is a substantial 17.5-inch build backed by a 10-year limited warranty, with CertiPUR-US certified foams, and it works on an adjustable base. At this height, plan for deep-pocket sheets and check your frame height before delivery.
How to shop it at Mattress Overstock
Mattress Overstock is an independent Kentucky retailer that has served the state since 2012, with five showrooms you can walk into with no appointment: Lexington (on Nicholasville Road), Georgetown, Somerset, London and Richmond. Come lie on this bed in your own sleeping position before you commit, and the team can set it up beside the Series Three or the rest of the Beautyrest Black lineup so you feel the difference for yourself. Select your size to see the live Mattress Overstock price. Delivery, setup and old-mattress haul-away are all free across the Kentucky service area, usually next business day when your size is in stock, and your purchase is backed by a 100-day comfort guarantee. Because everyone on the floor is paid the same no matter which brand you choose, the guidance you get is honest, never pushed toward the top of the line. Lie on it in Lexington this week, then decide.
What makes this mattress different
Flagship firm, cushioned top (6/10)
Firm coil support under a pillow-top surface: firm but not hard, done at the top of the Black line.
4K Micro Coils
The finest coil layer Black builds. Thousands of responding points make firm support track your body instead of pushing back flat.
Apex Top reinforced edges
Standard on every Series Four model. The perimeter stays firm to sit and sleep on, so the full width of the bed stays usable.
HD Memory Foam plus a cushioned top
High-density foam, Self-Response Latex and Micro Diamond foam soften the surface without softening the support underneath.
Cool-to-the-touch over coils
A cool cover and Micro Diamond foam pull heat off the surface, over a coil core that breathes far more than all-foam can.
Strong motion isolation for couples
Pocketed coils move independently, so a partner turning over barely crosses to your side of the bed.
Substantial 17.5-inch build
A luxurious profile. Plan for deep-pocket sheets and check your frame height; it works on an adjustable base.
10-year warranty, CertiPUR-US foams
Backed by a 10-year limited warranty and CertiPUR-US certified foams, plus a 100-day comfort guarantee from Mattress Overstock.
Firm support, flagship hardware, layer by layer
The Series Four Firm Pillow Top stacks the flagship Black hardware over a firm-tuned core, top to bottom:
- Cool-to-the-touch cover. Reads cool when you first lie down and helps pull heat off the surface.
- Cushioned pillow top. HD Memory Foam, Self-Response Latex and Micro Diamond foam soften the surface and ease pressure off your shoulders, so the firmness beneath never feels like a board.
- 4K Micro Coils. The finest coil layer Black builds. It breaks the surface into thousands of responding points, which is what makes firm support feel precise here rather than uniformly hard.
- Triple-Stranded Pocketed Coil core, firm-tuned. The structural layer. Coils move independently for strong motion isolation and hold your spine level.
- Apex Top edge. Reinforces the perimeter so the edges stay firm to sit and sleep on.
The result is a 17.5-inch build that feels firm but not hard, with a 10-year limited warranty and CertiPUR-US certified foams. For the same firm-with-cushion idea on 2K coils a tier down, see the Series Three Firm 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.
Flagship firm for back sleepers, with honest exceptions
Back sleepers: the best fit. Firm coil support keeps your spine level while the 4K Micro Coils make that support precise, and the cushioned top keeps it from feeling hard.
Combination sleepers who lean firm: supportive for back and stomach, with enough surface give to roll to your side without fighting the bed.
Stomach sleepers: a good match. Firm support keeps your hips from sinking, which is what protects your lower back in this position.
Couples: strong here. Pocketed coils isolate motion so one partner barely feels the other move, and the Apex edges keep the full width of the bed usable.
Heavier sleepers: the firm coil core gives real, lasting pushback if softer beds have bottomed out on you before.
Probably not for you if: you want firm for less (the tier-down Series Three Firm Pillow Top), you want a true rock-firm surface with no cushion (an extra-firm model is the honest pick), or you are a dedicated side sleeper who needs a deep shoulder cradle (a plush model serves you better).
Specifications
| Height | 17.5" |
|---|---|
| Feel | Firm Pillow Top |
| Firmness | 6 out of 10 (10 = firmest) |
| Construction | Pillow top with 4K Micro Coils, HD Memory Foam, Self-Response™ Latex and Micro Diamond™ foam over a firm-tuned Triple-Stranded Pocketed Coil® core, with Apex Top edge support: 17.5 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
How firm is it?
About a 6 out of 10: firm support with a cushioned pillow top, so it is firm but not hard. The 4K Micro Coils make the support precise rather than uniformly stiff.
What makes Series Four the flagship?
4K Micro Coils for the most individualized support Beautyrest Black builds, an Apex Top for reinforced edges on every model, and added HD Memory Foam, on top of everything the lower series already do.
How is it different from the Series Three Firm Pillow Top?
4K Micro Coils instead of 2K, an Apex Top edge, and added HD foam, so the support reads your body more finely. The Series Three Firm Pillow Top is the tier below, with the same firm-with-cushion feel for less.
Is this a good mattress for back and stomach sleepers?
Yes. Firm, level support is what back and stomach sleepers usually want, and that is exactly what this bed is tuned for. Dedicated side sleepers may want more give at the shoulder and should look at a plush model instead.
Will I feel my partner move?
Very little. The Triple-Stranded Pocketed Coils move independently, so when one person turns over the motion barely crosses the bed. The reinforced Apex edges also keep the full width of the mattress usable, which helps when you share.
Does it sleep hot?
It is built to sleep cooler than all-foam. The cover reads cool to the touch, Micro Diamond foam helps pull heat off the surface, and the coil core lets air move through the bed in a way a solid foam mattress cannot. If sleeping hot is your single biggest issue, a firmer feel like this one breathes a little better than a plush pillow top.
How tall is it, and will my sheets fit?
It is a substantial 17.5-inch build. Plan on deep-pocket sheets, and measure your frame height so the bed sits where you want it. It is also compatible with an adjustable base.
What is the warranty, and is it certified?
It is backed by a 10-year limited warranty, and the foams are CertiPUR-US certified. Your purchase from Mattress Overstock also comes with a 100-day comfort guarantee.
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, and hauls the old mattress away, all free in the service area. 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. There is no cash refund, but no restocking-fee games either.
Can I see this mattress in person near me?
Yes, and with a mattress that is the smart move. 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, set up beside the Series Three so you can feel the difference. Delivery and old-mattress haul-away are free across the Kentucky service area, 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.
