Beautyrest
Beautyrest Black® Series Three 15.75" Medium Hybrid Mattress
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The honest verdict: the Series Three Medium Hybrid is the suits-almost-anyone medium of the Beautyrest Black Hybrid line, a true 5 out of 10 on a tall 15.75-inch frame, with the Series Three comfort upgrades a plain medium does not get. It feels close to the standard Series Three Medium; choose between them by lying on both, not by reading a spec sheet.
The feel: a true medium, refined
A true 5 out of 10 is the feel most people land on once they stop guessing and start lying down: it contours where you press in at the shoulder and hip, and holds firm where you do not. What sets this one apart from an ordinary medium is the comfort layer. Self-Response™ Latex is more responsive than foam alone, so it follows your shape and springs back instead of holding a dent, and the SurfaceTouch™ Gel quilted under the cover gives the first inch a controlled, even pressure relief rather than a slow, sinking softness. Under all of it, the Triple-Stranded Pocketed Coil® core is the steady support you feel along your lower back.
What you notice in the first few minutes
On your back, your hips settle into the latex while your lumbar curve stays supported: no hammock sag, no hard spot. The cover is cool to the touch, and Sleep Climate™ cooling with Micro Diamond™ memory foam pulls heat off the surface rather than trapping it, so the bed does not warm the way an all-foam medium can. The coils move independently, so a partner shifting or getting up barely reaches your side.
Who it suits, and who it does not
This is the refined all-rounder. Back and combination sleepers tend to be happiest here, because a true medium with latex refinement supports the widest range of positions without forcing you into one. Couples with two styles do well too: medium splits the difference between firm and soft, and the coils keep one person's movement from waking the other. Run warm at night? The Series Three cooling is aimed at you. It is not the right bed for everyone, and the Mattress Overstock team would rather say so up front:
- If you want plush or firm specifically. Medium is the middle, and a true 5 is a compromise you will feel if you already sleep best on something soft and cradling, or firm and flat.
- If you want 2K Micro Coils and a cushioned top. This hybrid gets the latex, gel, and Micro Diamond™ cooling, but not the micro-coil layer or pillow-top surface. Those live in the Series Three Medium Pillow Top.
How it compares inside the lineup
The closest bed is its own sibling. The standard Series Three Medium is the same true-medium feel in the same line, so choosing between them is a lying-down decision. Lie on both and let your body pick. Love the medium feel but want to spend a tier less? The Series Two Medium steps down to gel-and-foam comfort without the Self-Response Latex. See where each sits in the full Beautyrest Black lineup. The CertiPUR-US certified foams sit on a coil core that resists the body impression a deep all-foam medium can develop, it carries a 10-year limited warranty, and it works on an adjustable base.
How to shop it at Mattress Overstock
Mattress Overstock is an independent Kentucky retailer that has served the state since 2012, with five showrooms and no appointment needed: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. With two Series Three mediums this close in feel, lying on both is the honest way to decide. 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, but no restocking-fee games either. Delivery is free across the Kentucky service area, setup is included, and the team hauls the old mattress away. Because everyone on the floor is paid the same no matter which brand you choose, the guidance stays honest and never gets pushed up a tier. Select your size to see the live Mattress Overstock price, or come lie on this exact mattress at the showroom nearest you.
What makes this mattress different
A true universal medium, refined
A genuine 5-out-of-10 medium in the Beautyrest Black Hybrid line, tuned to suit back, side, and combination sleepers without forcing a position.
Self-Response™ Latex + SurfaceTouch™ Gel
Responsive latex follows your shape and springs back, and surface gel gives the first inch an even, controlled pressure relief that foam alone cannot.
Sleep Climate™ cooling + Micro Diamond™ foam
A cool-to-the-touch cover and diamond-infused memory foam pull heat off the surface, so this medium sleeps cooler than an all-foam one.
Triple-Stranded Pocketed Coil® core
Steady lower-back support and excellent motion separation, so a partner getting up barely reaches your side of the bed.
Smooth hybrid surface, 15.75 inches, adjustable-base ready
A smooth contouring top rather than a quilted one, on a tall hybrid build that works on an adjustable base. CertiPUR-US certified foams, 10-year limited warranty.
Lie on it before you commit
Two Series Three mediums sit a hair apart in feel. Try this exact bed at a Kentucky showroom, with free local delivery, setup, and old-mattress haul-away when you buy.
The refined medium, layer by layer
Top down, the Series Three Medium Hybrid starts with a cool-to-the-touch cover and SurfaceTouch™ Gel quilted into the surface for immediate, even pressure relief. Below that, Self-Response™ Latex adds responsive contouring that springs back instead of holding a dent, and Sleep Climate™ cooling with Micro Diamond™ memory foam moves heat away from the body. All of it sits on the Triple-Stranded Pocketed Coil® core, tuned to a true medium, which carries the load and keeps one sleeper's movement from crossing the bed. It is a smooth hybrid surface, not a quilted one, so it contours rather than floating you on a pillow top.
It feels close to the standard Series Three Medium, so choose between them by feel. For 2K Micro Coils plus a cushioned top, step up to the Medium Pillow Top; to spend a tier less, the Series Two Medium keeps the gel-and-foam comfort without the latex. See them side by side 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 all-rounder
Back sleepers: a true medium lets your hips settle while the coil core holds your lumbar curve, so you get contour without sag.
Combination sleepers: the responsive latex changes shape with you, so moving from back to side through the night does not mean fighting the bed.
Couples with different styles: medium is the safest middle ground between a firm sleeper and a soft one, and the Triple-Stranded Pocketed Coils keep one person's movement from waking the other.
Hot sleepers: the cool-to-the-touch cover, Sleep Climate™ cooling, Micro Diamond™ foam, and a breathable coil core target the heat an all-foam medium tends to trap.
Side sleepers who want gentle contour: the shoulder and hip get real relief here, though dedicated side sleepers who want a deeper cradle may prefer a plush or a pillow top.
Probably not for you if: you sleep best on a firm, flat surface or a soft, sinking one (medium is the middle), or you specifically want the 2K Micro Coils and cushioned top of the Medium Pillow Top.
Specifications
| Height | 15.75" |
|---|---|
| Feel | Medium Hybrid |
| Firmness | 5 out of 10 (10 = firmest) |
| Construction | Cool-to-the-touch cover and SurfaceTouch™ Gel over Self-Response™ Latex, Micro Diamond™ foam, and a true-medium Triple-Stranded Pocketed Coil® core: 15.75 inches, medium hybrid. |
| 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 Medium Hybrid?
It is a true medium, about 5 out of 10 on a scale where 10 is firmest. Self-Response™ Latex and SurfaceTouch™ Gel give it a refined, responsive pressure relief in a smooth hybrid build, which makes it comfortable for back, side, and combination sleepers.
How is it different from the standard Series Three Medium?
They are very close: the same true-medium feel in the same Series Three line. The main difference is the build and height. The best way to choose is to lie on both, which you can do at any Mattress Overstock showroom. Here is the standard Series Three Medium.
What is the difference between a hybrid and a quilted innerspring?
A hybrid has a smooth surface that contours to you for pressure-relieving comfort. A quilted innerspring has a quilted surface with a more on-top, sink-free feel. This bed is the hybrid, so it contours rather than floating you on a quilted top.
Does it have 2K Micro Coils?
No. In the Beautyrest Black Series Three, the 2K Micro Coils are reserved for the pillow-top models, such as the Medium Pillow Top. This hybrid gets Self-Response™ Latex, SurfaceTouch™ Gel, and Micro Diamond™ cooling over the Triple-Stranded Pocketed Coil® core.
Does it sleep hot?
It is built to run cool for a medium. The cover is cool to the touch, Sleep Climate™ cooling and Micro Diamond™ memory foam pull heat off the surface, and the Triple-Stranded Pocketed Coil core breathes more than solid foam. If you tend to sleep warm, this is one of the cooler mediums in the line.
Will it work on an adjustable base?
Yes. The Series Three Medium Hybrid is compatible with an adjustable base, and it also works on a sturdy flat foundation or platform. If you are pairing it with a base, the floor team can walk you through the options that fit it.
Is there fiberglass in this mattress?
No. The Beautyrest Black uses CertiPUR-US certified foams, which are made without formaldehyde, prohibited phthalates, or heavy metals and meet low-VOC standards for indoor air quality. If you want to confirm the exact materials for your size, the showroom team can pull the spec sheet with you.
How long does it take to break in, and will it off-gas?
Most sleepers feel settled within the first week or two as the latex and foams relax to your body. Any light new-mattress scent from the CertiPUR-US foams fades within a few days with normal airflow. Because you can lie on this exact bed in the showroom first, you already know the feel before it arrives.
What sizes does it come in, and how do delivery and the comfort guarantee work?
Select your size on this page to see live availability and the Mattress Overstock price. We deliver across Kentucky with our own team, usually next business day when your size is in stock, set it up, and 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, 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. Delivery is free across the Kentucky service area and the old mattress goes with us, 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.
