Beautyrest
Beautyrest Black® Series Three 15.25" Medium Mattress
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The honest verdict: the Series Three Medium is the refined Black medium for people who do not want a tall bed. It runs a true 5 out of 10 with the Series Three comfort upgrades, Self-Response™ Latex and SurfaceTouch™ Gel, plus Micro Diamond™ cooling, all on a clean tight top instead of a pillow top. Same universal medium feel, same coil core, lower and tidier profile. (The 2K Micro Coils that Series Three is known for live only in the pillow-top models; this is the latex-and-gel refinement.)
The feel, told straight
A true medium is the closest thing to a universal feel: you sink in just enough at the shoulders and hips to take the edge off pressure, and the bed holds your spine level the rest of the way. What separates Series Three from a plain medium is the two-layer surface. SurfaceTouch™ Gel is quilted right into the top for immediate give the moment you lie down, and the Self-Response™ Latex underneath presses back as you settle rather than slowly caving the way ordinary foam does. That responsive, springs-back-at-you relief is the whole reason to step up to Series Three.
The first few minutes on it
You notice the cool-to-the-touch cover first, then a surface that gives a touch and steadies under you. Cooling here is Sleep Climate™ Technology paired with Micro Diamond™ memory foam, both built to move heat away from the surface, over a coil core that breathes far more than any all-foam bed, so it does not turn into a heat trap an hour after you settle in. Want to feel exactly that? Lie on it at your nearest Kentucky showroom in your own sleeping position.
Who it fits, and who it honestly does not
Beautyrest builds this one for all sleepers, and the medium tuning backs that up: back sleepers get level support, side sleepers get shoulder and hip room without sinking, and combination sleepers get a feel that works in more than one position. If you want refined Series Three comfort but not a tall pillow top, this configuration is your pick. The Mattress Overstock floor would rather tell you who it is not for now than have you learn it at home:
- If you want the 2K Micro Coils plus a cushioned top, those live in the Series Three Medium Pillow Top. This tight-top model does not include the 2K Micro Coils.
- If you want the more accessible Black medium, the Series Two Medium is a tier down and skips the Self-Response™ Latex.
- If you specifically want plush or firm, medium is the middle, and you will likely be happier at one end or the other.
How it compares, and living with it
Two comparisons decide this bed. Against the Series Two Medium one tier down, Series Three adds the Self-Response™ Latex and Micro Diamond™ cooling, so you are paying for more responsive pressure relief and better surface cooling, not a different firmness; both land at a true medium. Against its own pillow-top sibling, the pillow top stacks on the 2K Micro Coils and a cushioned surface on a taller build, while this tight top stays cleaner and lower. Both are lying-down questions, not spec-sheet ones. What couples notice most over months is the Triple-Stranded Pocketed Coil® core: the coils move independently, so one partner turning over barely carries across the bed. It is a premium Black build on CertiPUR-US certified foams, works with an adjustable base, and carries a 10-year limited warranty.
Why buy 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, no appointment needed: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Come lie on this one next to the Series Two and the pillow top and let your back pick. Shoppers rate the experience about 4.7 stars across 535 Google reviews, and the guidance is honest for a simple reason: everyone on the floor is paid the same no matter which brand you choose. You also get a 100-day comfort guarantee, so if the feel 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 either). Free local delivery and setup are included, and the old mattress is hauled away at no charge. To see pricing, select your size for the live Mattress Overstock price, or compare every medium tier in the full Beautyrest Black lineup.
What makes this mattress different
Refined medium, on a tight top
A true 5-out-of-10 medium with the Series Three latex-and-gel surface, on a cleaner, lower profile than the pillow-top model.
Two-layer pressure relief
SurfaceTouch™ Gel quilted into the surface for immediate give, over Self-Response™ Latex that presses back as you settle, more responsive than plain foam.
Sleep Climate™ + Micro Diamond™ cooling
Sleep Climate™ Technology, Micro Diamond™ memory foam, and a cool-to-the-touch cover move heat off the surface, the Series Three cooling upgrade.
Triple-Stranded Pocketed Coil® core
Independent coils carry your spine level and keep a partner's movement on their own side of the bed.
Built for all sleepers
Medium tuning gives back, side, and combination sleepers level support with enough give to relieve pressure.
Adjustable-base ready, 10-year warranty
A premium Black build on CertiPUR-US certified foams, compatible with an adjustable base and backed for 10 years.
Feel it in a Kentucky showroom
Lie on it next to the Series Two and the pillow top at five MO showrooms, with free local delivery and old-mattress haul-away.
The refined medium, layer by layer
The Series Three Medium stacks Beautyrest's comfort upgrades over a true-medium coil core, tuned to a clean tight top rather than a pillow top.
- Cool-to-the-touch cover. The first thing you feel; works with the foams below to pull heat off the surface.
- SurfaceTouch™ Gel, quilted in. Built right into the surface for immediate pressure relief the moment you lie down.
- Self-Response™ Latex. The Series Three step-up: responsive latex that presses back as you settle, instead of slowly caving like ordinary foam.
- Micro Diamond™ memory foam + Sleep Climate™ Technology. The cooling system, designed to move heat away from the body through the night.
- Triple-Stranded Pocketed Coil® core. Independent coils for level support and motion separation, 15.25 inches in a tidy profile.
The 2K Micro Coils that Series Three is known for sit only in the pillow-top models, so for those plus a cushioned surface see the Medium Pillow Top. For the medium one tier down, the Series Two Medium skips the Self-Response™ Latex. Compare every medium tier 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 refined medium for a tidy profile
Back sleepers, a true medium holds your spine level while giving just enough at the hips to relieve pressure.
Side sleepers, the latex-and-gel surface lets your shoulder and hip settle in without the bed caving under them.
Combination sleepers, medium is the feel that works in more than one position, so changing sides at 3 a.m. does not wake you.
Shoppers who want refined comfort on a clean profile, this is the Series Three upgrade without a tall pillow top, lower and tidier on the frame.
Couples, the Triple-Stranded Pocketed Coil® core keeps one partner's movement off the other's side of the bed.
Probably not for you if you want the 2K Micro Coils and a cushioned top (the Medium Pillow Top), the more accessible medium (the Series Two Medium), or a specifically plush or firm feel.
Specifications
| Height | 15.25" |
|---|---|
| Feel | Medium |
| Firmness | 5 out of 10 (10 = firmest) |
| Construction | Tight top with cool-to-the-touch cover and SurfaceTouch™ Gel over Self-Response™ Latex, Micro Diamond™ foam, and a true-medium Triple-Stranded Pocketed Coil® core: 15.25 inches, medium. |
| 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 15.25" Medium?
A true medium, about 5 out of 10, with Series Three latex and gel for refined pressure relief on a clean tight top. It is comfortable for back, side, and combination sleepers, which is why Beautyrest builds it for all sleepers.
Does this one have the 2K Micro Coils?
No. Series Three's 2K Micro Coils are reserved for the pillow-top models. This tight-top medium gets the Self-Response™ Latex, SurfaceTouch™ Gel, Sleep Climate™ Technology, and Micro Diamond™ cooling. For the 2K coils plus a cushioned top, see the Medium Pillow Top.
How is it different from the Series Two Medium?
Both land at a true medium, so the difference is the comfort hardware, not the firmness. Series Three adds Self-Response™ Latex for more responsive pressure relief and Micro Diamond™ cooling on top of the Series Two build. The Series Two Medium is the tier below.
Why pick the tight top over the pillow top?
If you want the refined Series Three feel on a lower, tidier profile, the tight top is the cleaner pick at 15.25 inches. The Medium Pillow Top adds the 2K Micro Coils and a cushioned surface on a taller 16.25-inch build. It is a lying-down decision, so it is worth feeling both side by side.
How does it sleep for hot sleepers?
Cooling comes from Sleep Climate™ Technology, Micro Diamond™ memory foam, and a cool-to-the-touch cover, all over a coil core that breathes far more than an all-foam bed. The cover feels cool to the touch at first and the coil core keeps air moving through the night, so it does not turn into a heat trap the way a dense all-foam medium can.
Is it good for couples and motion?
Yes. The Triple-Stranded Pocketed Coil® core uses independent coils, so when one person turns over the movement barely carries across to the other side. That is one of the strongest reasons to choose a Beautyrest Black coil bed over an all-foam one.
Will it work with my adjustable base?
Yes. This is a premium Black build on CertiPUR-US certified foams and is compatible with an adjustable base. If you sleep on an adjustable frame, this model flexes with it, and our team can confirm fit for your specific base in the showroom.
What about off-gassing and certifications?
The foams are CertiPUR-US certified, which means they are made without formaldehyde, prohibited phthalates, or heavy metals and meet low-VOC standards for indoor air quality. Any light new-mattress smell is normal and fades within a few days of airing out.
What size should I buy, and will my sheets fit?
It comes in the standard run from Twin XL up to Cal King. The profile is 15.25 inches, so standard fitted sheets work fine and you do not need extra-deep-pocket sheets. We can help you match the size to your frame in any of our five Kentucky showrooms.
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. Free delivery and old-mattress haul-away are included across our Kentucky service area, you get a 100-day comfort guarantee, 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.
