Sierra Sleep by Ashley
Sierra Sleep Limited Edition Firm Mattress
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The Sierra Sleep Limited Edition Firm is a straightforward call: if you want a mattress that holds you up instead of folding around you, this is one of the firmest beds we carry, and it earns that firmness honestly. If you already know you sleep best sinking into a deep memory foam hug, this one will feel like a plank to you, and that is fine, there are softer Sierra Sleep beds built for exactly that.
How it is built
Ashley builds this model (M410 in the Sierra Sleep line) around a wrapped coil support core, wrapped in a 4-way stretch knit cover for a smooth sleep surface. Under the cover sits a comfort layer of luxury cotton fiber and polyester fiber, then high-density quilt foam layered directly over high-density gel-infused memory foam. That gel layer does the work of taking the edge off a firm surface without turning it soft: it relieves pressure at the shoulders and hips while the coils underneath keep the whole bed from bottoming out. Below that sits ultra-firm support foam and a high-density foam base, and the wrapped coils are reinforced at the perimeter by two rows of thicker-gauge coils for stronger edge support when you sit on the side of the bed. The finished mattress runs a 12 inch profile.
Because the support core is individually wrapped steel coils rather than solid foam, air moves through the mattress more freely than an all-foam design, which helps it sleep cooler night after night. The coil base also brings back more classic mattress bounce, and makes it easier to reposition yourself, than a memory-foam-only bed typically allows.
Who it suits
- Back and stomach sleepers who want their hips lifted and their spine kept level, not sinking
- Side sleepers who have tried plush or medium beds and found themselves wanting more push-back, not less
- Couples sharing a bed who want one supportive surface that holds up evenly across both sides
- Anyone replacing an old, sagging mattress who wants something that stays flat and even for years, not months
Skip it if you are a committed side sleeper who needs deep contouring at the shoulder, or if the phrase firm mattress already makes you nervous. This is a genuinely firm bed, not a marketing firm.
Delivery and setup
This mattress ships compressed in a box rather than delivered flat, so plan on roughly 48 hours after unboxing for it to fully expand and settle before you judge how it feels. It pairs well with a supportive foundation or platform frame, which lets the wrapped coils and edge support do their job the way they were designed to. Sierra Sleep backs the build with a 10-year non-prorated warranty, which is a reasonable signal of how confident Ashley is in a coil-and-foam hybrid holding its shape over time.
The most honest way to know if a firm mattress is right for you is to lie on one in your own sleeping position for a few minutes, which is exactly what our Kentucky showrooms are set up for. Come stretch out on the Sierra Sleep Limited Edition Firm before you decide.
What makes this mattress different
Wrapped coil support core
Individually wrapped steel coils form the base of the mattress, giving it a genuinely firm, stable feel that doesn't sink or bottom out under weight.
Gel-infused memory foam comfort layer
A layer of high-density gel memory foam sits over the coils to take the hard edge off a firm surface and ease pressure at the shoulders and hips.
Reinforced perimeter edge support
Two rows of thicker-gauge coils run around the outside of the mattress, so the edge holds firm when you sit down to put on shoes or when a partner sleeps near the side.
4-way stretch knit cover
A smooth, breathable knit cover stretches with the mattress instead of bunching, keeping the sleep surface even.
Sleeps cooler than an all-foam firm bed
Air moves through the wrapped coil layer in a way solid foam cannot, which helps carry heat away from a firm mattress that would otherwise trap it.
High-density foam base for shape retention
A dense foam base beneath the coils resists breaking down or developing a body impression over years of nightly use.
12 inch profile, ships compressed
The finished mattress measures 12 inches and arrives compressed in a box; plan on roughly 48 hours after unboxing before it fully expands.
10-year non-prorated warranty
Sierra Sleep backs this build with a 10-year non-prorated warranty against manufacturing defects.
A wrapped coil core built to stay firm, not go soft
The Limited Edition Firm (Ashley model M410) starts from the bottom up with a high-density foam base, topped by individually wrapped steel support coils. Those coils are reinforced at the perimeter with two rows of thicker-gauge coils, so the edge of the mattress holds up rather than collapsing when you sit on it. Above the coils sits ultra-firm support foam, then high-density quilt foam layered directly over high-density gel-infused memory foam, and finally a comfort layer of luxury cotton fiber and polyester fiber under a 4-way stretch knit cover.
That order matters: the firmness comes from the coil and support-foam foundation, while the thinner gel memory foam layer up top exists only to soften the immediate surface, not to let you sink. Because the core is wrapped coils rather than solid foam, the mattress also breathes better and sleeps cooler than a foam-only bed built to the same firmness. The finished mattress runs 12 inches and ships compressed in a box.
See the full Sierra Sleep lineup →Built for sleepers who want to stay on top of the bed
Back sleepers: firm support keeps your hips from dipping and your spine level, which is the position that benefits most from a genuinely firm bed.
Stomach sleepers: this is the sleep position that needs firm the most. A softer mattress lets the hips sag and the lower back arch; this build keeps you flat instead.
Firm-leaning side sleepers: if you already know you don't like sinking in, and want a bed that pushes back rather than cradles, the gel memory foam layer takes just enough edge off the coils to make that workable.
Couples on a shared mattress: the wrapped coil core with reinforced perimeter support holds up evenly whether one or two people are sleeping on it, and the edge stays supportive for sitting down.
Anyone replacing a sagging mattress: the high-density foam base and coil support core are built to resist the body impressions that make an old mattress feel like a hammock.
Probably not for you if: you are a committed side sleeper who needs deep shoulder contouring, or you know from past experience that firm beds leave your hips and shoulders sore. A medium or plush model in the Sierra Sleep line will suit you better than this one.
Specifications
| Height | 12 in |
|---|---|
| Feel | Firm |
| Firmness | Firm, one of the firmest mattresses we carry |
| Construction | 4-way stretch knit cover over a cotton and polyester fiber comfort layer, high-density quilt foam over gel-infused memory foam, ultra-firm support foam, and an individually wrapped coil core reinforced with two rows of thicker-gauge perimeter coils, 12 inches total. |
| Cooling | The individually wrapped coil support core allows more airflow through the mattress than an all-foam design, helping this firm mattress sleep cooler than a foam-only bed built to the same firmness. |
| Motion isolation | Fair: the wrapped coil core brings back classic mattress bounce and easier repositioning, so motion transfer is more noticeable than on an all-foam bed, though the individually wrapped coils still contain movement better than open coil designs. |
| Warranty | 10-year non-prorated warranty |
Frequently asked questions
How firm is the Sierra Sleep Limited Edition Firm?
Genuinely firm. It is built on a wrapped coil support core with ultra-firm support foam, so it holds you up rather than lets you sink. A thin gel memory foam layer softens the immediate surface, but this is meant for sleepers who want a firm, supportive feel, not a plush or medium one.
Is this a memory foam mattress or a hybrid?
It is a hybrid. Individually wrapped steel coils form the support core, topped with high-density gel-infused memory foam and quilt foam. The coils are what give it classic mattress bounce and stronger edge support than an all-foam bed, along with a firmer, more stable feel underneath the comfort layer.
Will a firm mattress like this sleep hot?
It should sleep cooler than a firm all-foam mattress. The wrapped coil core allows air to move through the mattress in a way solid foam cannot, which helps carry heat away even though the top comfort layer is memory foam.
What kind of foundation or frame does it need?
A supportive foundation or platform frame with closely spaced slats works best. That keeps the wrapped coils and reinforced perimeter edge support doing their job the way they were built to, rather than flexing over gaps.
How long does it take to expand after delivery?
This mattress ships compressed in a box. Plan on roughly 48 hours after unboxing for it to fully expand and settle before you judge the feel.
What is the warranty on this mattress?
Sierra Sleep backs the Limited Edition Firm with a 10-year non-prorated warranty against manufacturing defects.
Does Mattress Overstock offer an at-home trial on this mattress?
No. Sierra Sleep beds like this one do not come with an at-home trial period. The honest way to know if a firm mattress works for you is to lie on this exact model in your own sleeping position at one of our Kentucky showrooms before you buy it.
Where can I see and feel this mattress in person?
Mattress Overstock is a Kentucky-owned company with showrooms in Lexington, Georgetown, Somerset, London, and Richmond. The Limited Edition Firm is on the floor next to our medium and plush Sierra Sleep models, so you can feel the difference in firmness for yourself in a couple of minutes.
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.
