Sierra Sleep by Ashley
Sierra Sleep Gray 1200 Hybrid Mattress
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The Sierra Sleep Gray 1200 Hybrid Mattress is for the sleeper who wants a firm hybrid feel done honestly: coils doing the heavy lifting, a modest gel memory foam layer taking the edge off pressure points, and none of the deep, warm sink that comes with an all foam bed. If you have tried memory foam and found it too soft or too warm, this is the coil backed alternative worth lying on.
The build
This is Ashley's Gray 1200 Hybrid, model M438, and the construction layers a charcoal infused gel memory foam comfort layer over high density support foam and a base support foam layer. Underneath, an individually wrapped coil system, 720 coils in Queen and 900 in King, gives each coil room to respond on its own instead of pulling on its neighbors, while a reinforced perimeter of steel encased coils runs the border of the mattress to hold the edge firm. A 4-way stretch cover with a concealed zipper closure wraps the whole build, which comes in at roughly 12 inches thick.
Feel and support
Comfort level here is firm. The charcoal infused gel memory foam softens contact at the shoulders and hips just enough to take the hard edge off, but the coil system underneath is doing most of the supporting, so you sit more on top of the mattress than sink into it. That coil core also means the mattress breathes: air moves through the wrapped coils in a way a solid slab of foam cannot, so sleepers who run warm on all foam mattresses tend to notice the difference. The reinforced steel encased coil perimeter holds its shape at the border too, so you can rest close to the edge without feeling like the mattress gives way underneath you.
Who it suits
- Back and stomach sleepers who want their hips and shoulders held at a consistent, level height
- Side sleepers who prefer a firmer surface with less sink than a plush or medium mattress
- Sleepers who run hot on memory foam and want a coil system underneath for airflow
- Couples who want to use the full width of the bed thanks to the reinforced coil edge
- Anyone pairing the mattress with an adjustable base, a standard foundation, or a platform frame
Who should skip it
If you specifically want the deep, contouring hug of thick memory foam, this firm hybrid build is not that; it leads with support, not cushioning. And if you are highly sensitive to a partner's movement at night, know that a coil system, even a wrapped one, will always carry more motion than an all foam mattress does.
Firm feels different under every body, and coils feel different under every body too. Come lie down on the Gray 1200 Hybrid in person at one of our Kentucky showrooms, right alongside the rest of our Sierra Sleep and Ashley lineup, before you decide.
What makes this mattress different
Firm, coil backed support
Rated firm on our showroom scale, built around a wrapped coil core instead of a thick stack of foam, for sleepers who want to rest on top of the mattress rather than sink into it.
Charcoal infused gel memory foam comfort layer
Softens contact at the shoulders and hips right at the surface, without adding the deep hug of a thicker all foam comfort layer.
High density support foam plus base support foam
Two dense foam layers sit between the comfort layer and the coils, keeping the transition even instead of letting you feel the springs underneath.
720 wrapped coils in Queen, 900 in King
Each coil is individually wrapped and responds on its own, so the support core flexes with your body instead of moving as one solid unit.
Reinforced steel encased coil perimeter
A firmer coil border runs the edge of the mattress, holding its shape so you can sit or sleep near the side without feeling like it gives way.
4-way stretch cover with concealed zipper closure
The cover moves with the layers underneath and the zipper stays out of sight, so nothing bunches or catches under a fitted sheet.
Approximately 12 inch profile
Tall enough to read as a full hybrid mattress while still working with standard depth sheets and most bed frames.
Adjustable base compatible
Built to flex cleanly with a power base, and just as much at home on a standard foundation or platform frame.
Coils for support, foam for the surface
The Gray 1200 Hybrid, Ashley model M438, splits the work between two systems instead of leaning on one. On top, a charcoal infused gel memory foam comfort layer meets the body first, softening contact at the shoulders and hips without letting you sink far into the mattress. Below that, high density support foam and a base support foam layer manage the transition, so the shift from foam to coils reads as one firm surface rather than two different mattresses stacked on top of each other.
The coil core is where this mattress does most of its work: 720 individually wrapped coils in Queen, 900 in King, each one responding to your body on its own instead of pulling on the coils around it. A reinforced perimeter of steel encased coils runs the full border, keeping the edge firm enough to sit on or sleep close to without feeling like the mattress rolls away underneath you. A 4-way stretch cover with a concealed zipper closure wraps the whole build, which comes in at roughly 12 inches total.
This is a hybrid built around a clear idea: let the coils supply the support and airflow, and let a modest foam layer handle comfort at the surface, not the other way around.
See the full Sierra Sleep lineup →Firm support with a coil backed lift
Back sleepers: the wrapped coil core keeps the hips from dipping and the spine level, the setup most back sleepers rest best on.
Stomach sleepers: a firm, coil backed surface keeps the midsection from sagging, which is the biggest complaint stomach sleepers have with softer mattresses.
Side sleepers who prefer less sink: if you have found memory foam mattresses cradle you deeper than you would like, the shallow comfort layer here over a firm coil base gives you a flatter, more supported surface.
Hot sleepers: the wrapped coil system allows air to move through the mattress in a way a solid block of foam cannot, so sleepers who run warm on all foam beds tend to notice the difference.
Couples: the reinforced steel encased coil perimeter holds its shape at the edge, so both sleepers can use the full width of the bed instead of favoring the center.
Probably not for you if: you want the deep, contouring hug of a thick memory foam mattress, or you are highly sensitive to a partner's movement at night. A coil system, even a wrapped one, transmits more motion than an all foam build, and this mattress is built for support first, not for a plush cradle.
Specifications
| Height | 12 in |
|---|---|
| Feel | Firm |
| Firmness | 8 out of 10 (10 = firmest) |
| Construction | Charcoal infused gel memory foam comfort layer over high density support foam and a base support foam layer, over an individually wrapped coil core (720 coils Queen, 900 coils King) with a reinforced steel encased coil perimeter: approximately 12 inches total. |
| Motion isolation | Moderate: individually wrapped coils flex on their own rather than as one connected unit, which limits motion transfer better than a traditional innerspring, though a coil system will always carry more movement than an all foam mattress. |
Frequently asked questions
How firm is the Sierra Sleep Gray 1200 Hybrid Mattress?
Firm. A charcoal infused gel memory foam comfort layer softens contact at the surface, but the individually wrapped coil core underneath, 720 coils in Queen and 900 in King, does most of the supporting, so you rest more on top of the mattress than sink into it.
Is the Gray 1200 Hybrid memory foam or innerspring?
Both. It is a true hybrid: a charcoal infused gel memory foam comfort layer and high density support foam sit over an individually wrapped coil support core, with a reinforced steel encased coil perimeter running the edge.
How many coils does this mattress have?
720 individually wrapped coils in Queen and 900 in King, backed by a reinforced steel encased coil perimeter along the border for added edge support.
Does this mattress sleep hot?
It should not. The wrapped coil support core allows air to circulate through the mattress in a way a solid slab of foam cannot, and the comfort layer on top is a shallower gel memory foam rather than a thick, heat trapping layer.
Who is this mattress a good fit for?
Back and stomach sleepers who want their hips and shoulders held level, and side sleepers who prefer a firmer surface with less sink than a plush or medium mattress. It also suits sleepers who run warm on all foam beds and want a coil core for airflow.
Can I use this mattress on an adjustable base?
Yes. The Gray 1200 Hybrid is adjustable base compatible, and it also works well on a standard foundation or platform bed frame.
How much motion transfer does a coil hybrid like this have?
More than an all foam mattress, but less than a traditional innerspring. The individually wrapped coils flex on their own instead of moving as one connected unit, which helps, but a coil system will always carry more movement than solid foam. If motion isolation is your top priority, an all foam Sierra Sleep model is worth comparing in the showroom.
Does this mattress come with an at-home trial?
No. Sierra Sleep mattresses, including the Gray 1200 Hybrid, do not come with an at-home trial period. Because firm and hybrid feels differ from body to body, our Kentucky showrooms are where you lie on this exact mattress and decide before you buy, not after.
Can I see this mattress in person near me?
Yes. Mattress Overstock is a Kentucky owned company with showrooms across the state where you can lie on the Gray 1200 Hybrid in your own sleeping position, in Queen or King, before you take one home.
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.
