Molecule Mattress
Molecule Reflex Firm Mattress
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The honest verdict: the Molecule Reflex Firm is built around one idea most foam beds treat as an afterthought: recovery. It is a firm, 10-inch, all-foam mattress engineered to sleep cool and hold your alignment so your body can do its overnight repair work. A cool-touch cover and high-airflow CoolVENT foam sit over LiftCOR gel support bands that reinforce your core, on a firm base that keeps the whole bed stable. At a firm feel (about 8 out of 10), it is for back and stomach sleepers, and active people, who want genuinely firm support that still sleeps cool.
Triple-layer construction, and what each layer does for you
- Cool-touch cover. A blend of cooling fibers that reads cool the moment you lie down, so you settle in faster instead of waiting for the bed to catch up.
- CoolVENT airflow foam. An open-cell comfort foam built to move air: Molecule rates it at 4.5x the airflow of traditional gel memory foam, which is how a foam bed keeps from turning into a heat trap by 3 a.m.
- LiftCOR gel support bands. Resilient gel bands engineered for 75% more supportive alignment, lifting exactly where you sink first: your core. Precision-contoured zoning means firmer support under your hips and a touch more give elsewhere.
- Firm support base. A dense foundation foam that anchors the comfort layers, reinforces stability, and absorbs motion so the bed stays quiet under two people.
The first few minutes lying on it
Lie down on your back and the Reflex Firm holds you on top of the bed rather than letting you settle into it. That is the on-top feel a firm sleeper looks for: your hips stay level with your shoulders, with none of the slow sink deep memory foam pulls you into. Roll onto your stomach and your hips do not drop, the alignment that keeps a stomach sleeper out of lower-back trouble. The cover reads cool right away, and because the comfort foam is built for high airflow, that coolness is meant to last instead of building heat through the night. Firm here means supportive, not hard or punishing.
Living with it: partner, motion, and your base
All-foam construction has one quiet advantage worth naming: motion isolation. With no coils to telegraph movement across the bed, a partner's shifts are absorbed where they happen and barely reach your side, which matters more than almost anything on the spec sheet if you sleep light next to someone restless. The Reflex Firm also works on an adjustable base, flexing and recovering with the frame if you like to read in bed or sleep slightly raised.
Who it is not for, and the team would rather say so now
- Side sleepers. A firm 8/10 will press on the shoulder; the Reflex Embrace Plush is the soft option.
- If you want a softer, supportive medium, the Reflex Boost Medium sits between.
- If you want coil bounce, Molecule is an all-foam recovery bed, not a hybrid.
To place it in the lineup: the Reflex Firm is the firmest and most on-top of the three, the Boost Medium is the balanced middle, and the Embrace Plush is the cushioning soft. Switching off an old foam bed that has gone soft in the middle? The Reflex Firm is the corrective: it brings back the support that sagging took away while keeping the cool, quiet, no-bounce feel of foam.
Why buy it from Mattress Overstock
Kentucky-owned and serving the state since 2012, with five showrooms you can walk into: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. "Sleeps cool" and "firm but not punishing" are claims you confirm by lying down, so come feel the Reflex Firm in your own sleeping position at any of the five, no appointment needed. You get a 121-night comfort guarantee; if it 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, free setup, and the team hauls your old mattress away. Everyone on the floor is paid the same no matter which brand you choose, so the guidance is honest. Select your size above to see the live Mattress Overstock price, and compare all three feels in the Molecule lineup.
What makes this mattress different
Triple-layer recovery build
A cool-touch cover and high-airflow CoolVENT foam over LiftCOR gel bands and a firm support base: 10 inches, all-foam, engineered around overnight recovery.
CoolVENT airflow foam
Open-cell comfort foam rated at 4.5x the airflow of traditional gel memory foam, so it sleeps cooler than the memory foam you are picturing.
LiftCOR gel support bands
Resilient gel bands engineered for 75% more supportive alignment, lifting your core where most foam beds let you sink.
Precision-contoured zoned support
Firmer support under the hips and a touch more give elsewhere keeps your spine aligned whether you are on your back or stomach.
Cool-touch cover
A blend of cooling fibers that feels cool the instant you lie down, so you relax and drift off faster.
Quiet under two people
All-foam construction with a firm base absorbs movement, so a restless partner barely reaches your side of the bed.
CertiPUR-US foam, made in the USA
Built in the USA with CertiPUR-US certified foam, tested for content, emissions, and durability.
Firm (8/10), 121-night comfort guarantee
Genuinely firm and on-top, recovery-engineered for back and stomach sleepers, with one of the longer comfort guarantees we offer.
Triple-layer recovery: cool on top, supported underneath
The Reflex Firm is an all-foam recovery mattress with three working layers, each doing one job well.
1. Cool-touch cover. A blend of cooling fibers that reads cool on contact, so the surface is not fighting you while you fall asleep.
2. CoolVENT airflow foam. An open-cell comfort foam built to move air, rated by Molecule at 4.5x the airflow of traditional gel memory foam. This is what keeps an all-foam bed from trapping heat the way old memory foam does.
3. LiftCOR gel support bands. Highly resilient gel bands engineered for 75% more supportive alignment, lifting exactly where your body sinks first: your core. Precision-contoured zoning firms up under the hips and eases slightly elsewhere, on a firm support base that anchors everything and keeps motion from crossing the bed.
Molecule's whole focus is recovery (sleep cool, stay aligned, let your body repair), and this is the firm expression of it. Want softer? The Reflex Embrace Plush; in between, the Reflex Boost Medium. See the Molecule lineup.
Shop the Molecule lineup →Firm, cool recovery for back and stomach sleepers
Back sleepers. The LiftCOR gel bands lift the core so your hips stay level with your shoulders, the firm support back sleepers need to wake up without a sore lower back.
Stomach sleepers. Firm, on-top support keeps your hips from dropping and arching your spine, the position that punishes soft beds fastest.
Hot sleepers. A cool-touch cover plus CoolVENT foam at 4.5x the airflow of standard gel memory foam make this one of the cooler all-foam beds we carry.
Active people and athletes. The whole bed is engineered around recovery, the same reason elite athletes have put their name behind the Molecule line.
Couples with mismatched schedules. All-foam motion isolation means one of you getting up early barely registers on the other side.
Probably not for you if you sleep on your side (a firm 8/10 presses the shoulder, so look at the Embrace Plush), you want a medium (the Boost Medium), or you want the bounce of coils (this is all foam).
Specifications
| Height | 10" |
|---|---|
| Feel | Firm |
| Firmness | 8 out of 10 (10 = firmest) |
| Construction | An instant-cool cover and high-airflow comfort foams over LiftCOR gel support bands and a high-density foam core: 10 inches, firm, all-foam. |
| Cooling | CopperWELL conducts heat away from the body, with high-airflow foam and an instant-cool cover, engineered to sleep cooler than standard memory foam. |
| Motion isolation | Excellent: all-foam construction absorbs movement, so a partner's shifts barely transfer. |
| Adjustable base | Yes, compatible with adjustable bases |
| Certifications | CertiPUR-US certified foams |
| Warranty | Lifetime limited warranty |
| Trial period | 121 days at Mattress Overstock |
Frequently asked questions
What makes a Molecule a recovery mattress?
Molecule engineers for overnight recovery: cool sleep (a cool-touch cover and high-airflow CoolVENT foam) and aligned support (LiftCOR gel bands that lift your core). The idea is to keep you cool and properly supported so your body's repair cycles aren't interrupted.
How firm is the Reflex Firm?
A firm feel, about 8 out of 10, supportive and on-top, for back and stomach sleepers. For a medium, see the Reflex Boost Medium; for soft, the Reflex Embrace Plush.
Does it really sleep cool?
It's engineered to. The cover is a blend of cooling fibers, and the CoolVENT comfort foam is rated at 4.5x the airflow of traditional gel memory foam. No mattress is air-conditioning, but this is one of the cooler all-foam beds we carry. Worth feeling in person.
What is it made of?
Three layers: a cool-touch cover, an open-cell CoolVENT airflow comfort foam, and LiftCOR gel support bands over a firm support base. It is 10 inches tall, all foam, with no coils.
Can I use it on an adjustable base?
Yes. The all-foam build flexes and recovers with an adjustable base, so it works well if you like to read in bed or sleep with your head or feet slightly raised. It also sits fine on a solid platform or a slatted frame with closely spaced slats.
Is it good for couples and motion?
Very. All-foam construction over a firm base absorbs movement where it happens, so a partner getting in and out of bed barely reaches your side. If one of you is a light or restless sleeper, this is one of the quieter beds we stock.
Does it contain fiberglass?
No. The Reflex Firm uses CertiPUR-US certified foam and is made in the USA. CertiPUR-US foam is tested for content and emissions, so you are not getting a hidden fiberglass fire layer.
How is this different from Molecule's newer 11-inch Reflex?
This is the 10-inch Reflex Firm, the firm all-foam bed in our Molecule lineup. Molecule has since released taller revamped Reflex models, but the 10-inch Firm is the focused, on-top recovery option we carry. Compare the feels we stock in the Molecule lineup.
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 we haul the old mattress away. You also get a 121-night comfort guarantee: if the feel isn't 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. We deliver free across our Kentucky service area and haul your old mattress away, 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.
