Sierra Sleep by Ashley
Sierra Sleep Chime 12 Inch Memory Foam Mattress
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The verdict: if you sleep mostly on your side and want a plush top layer that cushions your shoulders and hips without feeling like it will bottom out underneath you, the Sierra Sleep Chime 12 Inch Memory Foam Mattress (Ashley model M727) delivers exactly that. It is not built for committed stomach sleepers or anyone chasing a firm, springy surface.
How it's built
The Chime 12 Inch stacks a two inch layer of high density memory foam over a deep, firm support foam base, all wrapped in a four way stretch knit cover, twelve inches total. The memory foam is the plush part: it softens with your body heat and settles in around pressure points instead of pushing back against them. The support foam underneath does the opposite job, keeping the bed from feeling like it will give out under you. It is a simple two layer build with no coils, and that simplicity is part of the appeal: fewer parts, fewer things to wear out or squeak over time.
Feel and support
Ashley rates this model plush on its own firmness scale, and that matches how it sleeps: soft at first touch, then a firm foundation holds you level once you settle in. Because there are no coils, movement does not travel across the surface. If your partner gets up early or turns over in the night, you are unlikely to feel it on your side of the bed. The foam is also made from hypoallergenic material, which keeps dust mites, pollen, mold and pet dander from working into the sleep surface, a real plus if allergies are part of your household's sleep problems. It is adjustable base friendly as well, so it will keep working if you add a base that raises your head or feet later on.
Who it suits
- Side sleepers who want real cushioning at the shoulder and hip
- Back sleepers who prefer a softer, cradling surface over a firm one
- Couples and co-sleepers who want quiet motion isolation
- Guest rooms and rentals where a dependable plush foam bed beats a mystery mattress
Who should look elsewhere
Stomach sleepers and anyone who wants a firm, more responsive surface will likely find this too soft; a firmer model in the Chime lineup will suit you better. If you run hot at night, an all foam build without a dedicated cooling layer will sleep a bit warmer than a hybrid with coils, so weigh that against how much you value the pressure relief.
Delivery and what to expect
Like every mattress in a box, the Chime 12 Inch ships compressed and rolled. Unroll it, cut away the plastic, and give it a few hours, overnight is better, to fully expand before you judge the final feel. It's available in Twin, Full, Queen, King and California King, and it carries Ashley's 10 year limited warranty.
The honest way to know if the Chime 12 Inch is your mattress is to lie on it yourself. Stop by one of our Kentucky showrooms, find it on the floor, and spend a few minutes in your own sleeping position before you decide.
What makes this mattress different
Two inch memory foam comfort layer
A dedicated layer of high density memory foam sits right under the cover, softening with body heat so it settles around your shoulders and hips instead of pushing back.
Firm support foam base
Underneath the memory foam is a deep, firm support layer that keeps the mattress from feeling like it is bottoming out, even though the top feels plush.
Rated plush on Ashley's own scale
This is the soft end of the Chime lineup. Ashley classifies it as plush, a step softer than the medium and firm builds in the same collection.
Quiet for shared beds
An all foam build with no coils absorbs movement before it crosses the mattress, so a partner getting up early or shifting in the night is far less likely to wake you.
Hypoallergenic materials
The foam is made from hypoallergenic material that helps keep dust mites, pollen, mold and pet dander from working into the sleep surface.
Adjustable base friendly
The all foam construction bends cleanly with an adjustable base if you like to raise your head or feet, and it sits just as well on a standard platform or foundation.
Four way stretch knit cover
A stretch knit cover wraps the whole mattress for a smooth, breathable surface that moves with you instead of bunching.
Ships in a box
Like every mattress in this category, the Chime 12 Inch compresses and rolls for delivery. Unroll it, cut the plastic away, and give it a few hours to fully expand before judging the feel.
A plush comfort layer over a firm foundation
The Chime 12 Inch keeps its construction simple: two clear jobs, two layers. On top sits two inches of high density memory foam, the material that gives this mattress its plush, contouring feel. It softens with body heat and settles in around pressure points at the shoulder and hip rather than resisting them.
Underneath, a deep layer of firm support foam carries the rest of the twelve inch profile. Its job is structural: it keeps the softer memory foam above from compressing all the way through, so the mattress holds you level even though the surface feels soft. A four way stretch knit cover wraps the whole thing, adding a smooth, breathable layer that moves with you instead of resisting.
There are no coils in this build, which is why motion isolation is strong and why the feel stays plush edge to edge rather than firming up at the perimeter the way some coil mattresses do.
See the full Sierra Sleep lineup →Built for side and back sleepers who want a plush hug
Side sleepers: this is the group the Chime 12 Inch is built for. The plush memory foam layer cushions the shoulder and hip, the two spots that take the most pressure when you sleep on your side.
Back sleepers who like it soft: if you prefer a cradling surface over a firm, flat one, the plush feel works well here too, though back sleepers who want more lift under the lumbar may prefer a firmer model.
Couples and co-sleepers: the all foam, no coil build absorbs movement well, so a partner's early alarm or late night trip down the hall is less likely to wake you.
Allergy sensitive sleepers: the hypoallergenic foam helps keep common irritants like dust mites and pet dander out of the sleep surface.
Guest rooms and rentals: a dependable plush foam mattress at this price point is an easy, low risk pick for a room that needs to work for more than one type of sleeper.
Probably not for you if: you sleep on your stomach, you run hot and want a dedicated cooling layer, or you simply prefer a firmer, more responsive surface. A firmer model in the Chime lineup will suit those needs better.
Specifications
| Height | 12" |
|---|---|
| Feel | Plush |
| Firmness | Plush (softest tier of the Chime lineup on Ashley's own firmness scale) |
| Construction | 2 inch high density memory foam comfort layer over a firm support foam base, 12 inches total, wrapped in a 4 way stretch knit cover. |
| Motion isolation | Strong: the all foam, no coil build absorbs movement before it crosses the mattress, so a partner shifting or getting up is unlikely to wake you. |
| Warranty | 10 year limited warranty from Ashley Furniture Industries, with 1 year of labor coverage. |
Frequently asked questions
How firm is the Sierra Sleep Chime 12 Inch Memory Foam Mattress?
It's rated plush on Ashley's own firmness scale, the softest end of the Chime lineup. Expect a top layer that cushions and contours rather than pushes back, sitting on a firm support foam base so you do not feel like you are sinking through to the floor.
Who is this mattress best for?
Side sleepers get the most benefit from the plush comfort layer, since it cushions the shoulder and hip. Back sleepers who like a softer, cradling feel also do well here. Stomach sleepers and anyone who prefers a firm, responsive surface will likely want a firmer model instead.
Is the Chime 12 Inch memory foam or a hybrid?
All foam, no coils. A two inch layer of high density memory foam sits over a firm support foam base, twelve inches total, wrapped in a four way stretch knit cover.
Will I feel my partner move around at night?
Not much. Foam mattresses without coils absorb movement instead of transferring it across the surface, so a partner getting up early or shifting positions is far less likely to disturb your side of the bed.
Does this mattress sleep hot?
It can run a touch warmer than a hybrid with coils, since there is no dedicated cooling layer or airflow from springs. If you sleep hot and want a plush foam feel, ask our team about the cooling options in the Sierra Sleep lineup.
Is the foam hypoallergenic?
Yes. The foam is made from hypoallergenic material that helps keep dust mites, pollen, mold and pet dander from working into the sleep surface, a helpful detail for allergy sensitive households.
Can I use this mattress with an adjustable base?
Yes, the all foam build is adjustable base friendly, so it bends cleanly if you raise your head or feet. It also sits just as well on a standard platform or foundation.
What is Ashley's warranty on this mattress?
The Chime 12 Inch carries Ashley's 10 year limited warranty, with 1 year of labor coverage from the manufacturer.
Can I try this mattress before I buy it?
Sierra Sleep beds like this one do not include an at-home trial. The honest way to know if the Chime 12 Inch is right for you is to lie on it yourself. Mattress Overstock is a Kentucky-owned company with showrooms in Lexington, Georgetown, Somerset, London and Richmond, so find it on the floor and spend a few minutes on it in your own sleeping position before you decide.
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.
