Sierra Sleep by Ashley
Sierra Sleep Chime 12 Inch Hybrid Mattress
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The Chime 12 Inch Hybrid is Sierra Sleep's plushest hybrid on the floor: a soft, cushioned top layered over a full coil system, built for sleepers who want to sink in a little without giving up the springy support of an innerspring underneath.
How it's built
Ashley rates the Chime Ultra Plush, the softest position on its five-step firmness scale (Firm, Medium Firm, Medium, Plush, Ultra Plush), and the construction backs that up. A 4-way stretch knit cover wraps a high density super soft quilt foam layer, then a high density cooling gel memory foam layer sized specifically for lumbar support, then a high density upholstery grade comfort support foam transition. Underneath sits the part that keeps a soft top from feeling like a pile of pillows: a power packed, individually wrapped coil unit with Ashley Edge reinforcement around the perimeter, built to hold the edge, minimize motion transfer, and add support where foam alone would sag. A support pad anchors the base. Twelve inches total, shipped compressed in a box, with CertiPUR-US certified foams and a 10-year warranty from Ashley.
Feel and support
Lie down and the quilt and gel memory foam layers take the first bite of pressure at the shoulders and hips before the coils take over underneath, so you get the cushioned, sink-in feel of a soft mattress without losing the responsive push of springs. Foam on top, coils underneath, is the whole point of a hybrid built this soft: plush surface, without an all-foam bed's flatter, slower rebound. Ashley Edge coils along the perimeter also mean the edge of the mattress holds up when you sit down to put on shoes, instead of compressing the way some soft foam edges do.
Who it suits
- Side sleepers who want real cushioning at the shoulder and hip without an all-foam hug
- Sleepers coming off a mattress that felt too firm, who still want coils rather than solid foam underneath
- Lighter-weight sleepers, who feel the full plush effect without compressing straight down to the coils
- Guest rooms and kids' or teens' rooms that call for a genuinely soft, comfortable bed at an approachable price
It's probably not the right pick if you're a back or stomach sleeper who needs firmer lumbar support, if you run hot and want more airflow than a quilted foam top provides, or if you and a partner are on the heavier side and want a surface that resists compression rather than cushions into it. Sierra Sleep's Chime line runs firmer options if Ultra Plush turns out to be more give than your back wants.
Available Sizes
- Twin
- Full
- Queen
- King
- California King
Series: Chime 12 Inch Hybrid (Ashley model M697). The most reliable way to know if Ultra Plush is right for you is to lie on it: this exact mattress is on the floor at our Kentucky showrooms, so come try it in person before you decide.
What makes this mattress different
Ultra Plush on Ashley's own scale
Ashley rates this hybrid Ultra Plush, the softest step on its five point firmness scale (Firm, Medium Firm, Medium, Plush, Ultra Plush), so the cushioned feel is a deliberate part of the design, not just a marketing label.
Gel memory foam sized for the lower back
A high density cooling gel memory foam layer sits under the quilt foam specifically for lumbar support, so the softest part of the build still gives your lower back somewhere to rest instead of just sinking.
Coils underneath the plush top
A power packed, individually wrapped coil unit carries the support underneath the foam layers, so you get a soft surface without losing the responsive push of a real innerspring.
Ashley Edge perimeter reinforcement
Reinforced edge coils hold the perimeter up, so the side of the mattress supports you when you sit down to get dressed, instead of compressing the way some soft foam edges do.
Motion transfer built to stay contained
Ashley designs the wrapped coil unit to minimize motion transfer, so a partner turning over or getting up doesn't automatically carry all the way across to your side.
Ships compressed, sets up in the room
The Chime compresses into a box for delivery, so it moves through doorways and up stairs easily. Unbox it in the bedroom, remove the wrapping, and give it time to fully expand before making the bed.
CertiPUR-US foams, 10 year coverage
The foam layers are CertiPUR-US certified, and Ashley backs the mattress with a 10 year warranty: straightforward coverage for a straightforward hybrid.
Five sizes, one plush feel
Twin through California King all use the same 12 inch build and the same Ultra Plush comfort layer, so the feel doesn't change when the size does.
Six layers, softest at the top and firmest at the base
Every layer in the Chime works toward one goal: a genuinely soft top with somewhere firm to land on underneath. Start at the surface: a 4-way stretch knit cover wraps a high density, super soft quilt foam layer, the part that gives the Chime its plush first impression. Below that sits a high density cooling gel memory foam layer, positioned specifically for lumbar support rather than spread evenly across the whole mattress, so your lower back gets targeted relief instead of a uniform sink. A high density upholstery grade comfort support foam layer transitions from that cushioning down to the support system.
The support system is a power packed, individually wrapped coil unit with Ashley Edge reinforcement around the perimeter, engineered to minimize motion transfer and hold the edge of the bed up under weight, backed by a support pad at the base. That coil layer is what keeps several inches of soft foam from feeling like a pile of pillows: it gives the plush top somewhere responsive to rest on. The whole build compresses to 12 inches, ships in a box, and uses CertiPUR-US certified foams throughout, with a 10 year warranty from Ashley.
See the full Sierra Sleep lineup →Built for sleepers who want to sink in, not stay on top
Side sleepers: the super soft quilt foam and gel memory foam cushion the shoulder and hip, the two pressure points side sleeping loads most, while the coils underneath keep the surface from bottoming out.
Lighter-weight sleepers: less body weight means less pressure to compress a soft top down to the coils, so lighter sleepers tend to feel the full plush effect Ashley built into this mattress.
Anyone coming off a mattress that felt too firm: if a hard bed has left you sore at the shoulder or hip, the Ultra Plush comfort layer is a deliberate step in the other direction, with coils underneath so it doesn't feel like sinking into a pile of foam.
Guest rooms and kids' or teens' rooms: a genuinely soft, comfortable feel at a 12 inch profile and an approachable price, without asking a growing kid or an occasional guest to adjust to a firmer bed.
Combination sleepers who like a cushioned surface: the wrapped coil unit responds independently underneath, so rolling from your side to your back doesn't mean fighting a slow-recovery foam surface.
Probably not for you if: you sleep on your back or stomach and need firmer lumbar support (look at a Medium or Firm Sierra Sleep model instead), you run hot and want more airflow than a quilted foam top gives, or you and a partner are on the heavier side and want a surface that resists compression rather than cushions into it.
Specifications
| Height | 12 in |
|---|---|
| Feel | Ultra Plush |
| Firmness | 2 out of 10 (10 = firmest) |
| Construction | 4-way stretch knit cover over high density super soft quilt foam, high density cooling gel memory foam for lumbar support, and high density upholstery grade comfort support foam, above a power packed individually wrapped coil unit with Ashley Edge perimeter reinforcement and a support pad base: 12 inches total. |
| Cooling | The comfort layer includes a high density cooling gel memory foam layer, positioned for lumbar support, which Ashley designs to help offset the heat memory foam typically holds onto. |
| Motion isolation | The wrapped coil support unit is engineered with Ashley Edge reinforcement to minimize motion transfer, so a partner's movement is less likely to carry across the mattress than on a standard innerspring. |
| Warranty | 10-year warranty |
Frequently asked questions
How firm is the Sierra Sleep Chime 12 Inch Hybrid?
Ashley rates it Ultra Plush, the softest position on its five step scale (Firm, Medium Firm, Medium, Plush, Ultra Plush). Expect real cushioning at the surface from the quilt and gel memory foam layers, with a wrapped coil system underneath so the softness doesn't turn into a flat, sunk-in feel.
Is the Chime memory foam or a hybrid?
It's a hybrid. A quilt foam and gel memory foam comfort stack sits on top of a power packed, individually wrapped coil unit, so you get the cushioned feel of foam with the responsive support of a real innerspring underneath.
Does the coil system help with edge support?
Yes. Ashley builds Ashley Edge reinforcement into the perimeter of the coil unit, so the side of the mattress holds up when you sit on it to put on shoes, rather than compressing the way some all-foam edges do.
Will I feel my partner move during the night?
The wrapped coil unit is engineered to minimize motion transfer, with coils responding independently rather than the whole surface moving together, so a partner shifting or getting up is less likely to carry across the bed to your side.
Does the Chime contain fiberglass, or is it certified?
The foam layers are CertiPUR-US certified, meaning they're tested against content, emissions, and durability standards. Ashley backs the mattress with a 10 year warranty.
How tall is the mattress and how does it ship?
The Chime is a 12 inch profile that ships compressed in a box. Bring the box into the room where it will be used, remove the plastic wrapping, and give it time to fully expand before making the bed.
Is there an at-home trial with this mattress?
No, Sierra Sleep beds don't include an at-home trial period. The straightforward way to know if the Ultra Plush feel is right for you is to lie on this exact mattress at one of our Kentucky showrooms before you buy.
What sizes does the Chime come in?
Twin, Full, Queen, King, and California King, all built on the same 12 inch profile and the same Ultra Plush comfort layer, so the feel is consistent across every size.
Can I see this mattress in person near me?
Yes. Mattress Overstock is a Kentucky-owned company with showrooms in Lexington, Georgetown, Somerset, London, and Richmond. Come lie on the Chime in your own sleeping position before you decide, since Ultra Plush feels different to everyone.
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.
