Sierra Sleep by Ashley
Sierra Sleep Peak 2.0 8 Memory Foam Mattress
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The Sierra Sleep Peak 2.0 is a plain, firm memory foam mattress for sleepers who want to stay on top of the bed, not sink into it. If everything else on the floor has felt too soft, this is the one built to hold you up instead of give.
The build
Sierra Sleep is Ashley's in-house mattress line, and the Peak 2.0 (model M204) is an 8 inch tight top: no pillow top, no quilted crown, just a clean flat surface. Right under the cover sits a layer of high-density memory foam, doing the actual contouring at your shoulders and hips without turning the whole bed plush. Underneath that is a thick core of firm support foam, the layer carrying most of the height and most of the job, since it's also what keeps a partner's movement on one side of the bed from reaching the other. A stretch knit cover wraps the whole thing in a smooth, durable surface that holds its shape under a fitted sheet.
Like most foam mattresses at this price, it ships compressed in a box. Give it up to 48 hours to fully expand before you judge the feel. It's also built to flex with an adjustable base, and pairing it with a proper foundation keeps the manufacturer's warranty intact.
Feel and support
Firm is the whole point here. There's enough memory foam up top to soften the edge at your pressure points, but the support foam underneath is what you actually feel: a close, responsive surface rather than a slow sink. Lie flat on your back or stomach and your spine stays level instead of dipping in the middle.
Who it suits
- Back and stomach sleepers who want their hips and shoulders held level, not cradled.
- Anyone who has said the mattresses in every store feel too soft.
- Couples who want one partner getting up early or turning over to stay on their own side of the bed.
- Adjustable base owners who need a mattress that actually bends with the frame instead of fighting it.
Who should look elsewhere
Dedicated side sleepers chasing a deep hug at the shoulder, or anyone who wants the slow, sinking in feel of a thicker memory foam bed, will likely find the Peak 2.0 too firm. Ask the floor team about a plusher Sierra Sleep model or one of our hybrids instead.
The Peak 2.0 is backed by a 10 year manufacturer's warranty and comes in Twin, Full, Queen, King, and California King. Firm means something different to every body, so the only honest way to know if this is yours is to lie down on it. Come stretch out on the Peak 2.0 at one of our Kentucky showrooms before you decide.
What makes this mattress different
Firm, tight top surface
No pillow top and no quilted crown, just a flat, supportive surface for sleepers who want to stay on top of the bed.
High-density memory foam comfort layer
Sits right under the cover and contours at the shoulders and hips without turning the whole mattress soft.
Firm support foam base
A thick core of firm foam carries most of the height and helps keep movement on one side of the bed from reaching the other.
Stretch knit cover
Wraps the mattress in a smooth, durable surface that holds its shape and stays put under a fitted sheet.
Adjustable base compatible
Built to flex cleanly with a base that raises the head or the feet, not fight against it.
Ships compressed, expands at home
Arrives compressed in a box like most foam mattresses at this price. Give it up to 48 hours to fully expand before judging the feel.
10 year manufacturer's warranty
Backed by Sierra Sleep's warranty, kept intact by pairing the mattress with a supportive foundation.
Five sizes on the showroom floor
Twin, Full, Queen, King, and California King, so the same firm feel scales to any bedroom.
A firm surface built from two layers, not a dozen
The Peak 2.0 keeps its construction simple on purpose. Under the stretch knit cover sits a layer of high-density memory foam, just enough to soften the immediate surface and take the edge off at your shoulders and hips. Below that is the layer doing the real work: a thick core of firm support foam that carries most of the mattress's 8 inch height and keeps the surface from bottoming out under weight.
Because there are no coils, the firmness comes from a shallow comfort layer over a dense foam base, not springs, which is also why movement on one side of the bed is slow to reach the other. The whole mattress is wrapped in a stretch knit cover built to hold its shape night after night.
Firm isn't for everyone. If you want more give at the shoulder, ask the floor team to walk you through the rest of the Sierra Sleep lineup, which runs softer in other models.
See the full Sierra Sleep lineup →Built for the back and stomach sleeper who wants firm
Back sleepers: a firm surface keeps the hips from dipping and the spine level, which is the setup most back sleepers rest best on.
Stomach sleepers: this is the position firm mattresses were made for. A softer bed lets the midsection sag; the Peak 2.0 keeps you level instead.
Couples who sleep at different hours: the firm support foam base is built to keep motion from crossing the bed, so a partner getting up early or coming to bed late is less likely to wake you.
Adjustable base owners: the foam build bends cleanly with a base that raises the head or feet, instead of resisting it.
People who already know they like firm: if the plush beds everywhere else have never felt right, this is built for exactly that preference.
Probably not for you if: you're a dedicated side sleeper who wants a deep cradle at the shoulder, or you want the slow sinking feel of a thicker memory foam bed. Ask about a plusher Sierra Sleep model or a hybrid instead.
Specifications
| Height | 8 in |
|---|---|
| Feel | Firm |
| Firmness | Firm, minimal sink, close to the surface |
| Construction | 8 inch tight top: high-density memory foam comfort layer over a firm support foam base, wrapped in a stretch knit cover. |
| Motion isolation | Good: the firm support foam base is built to reduce motion transfer, so movement on one side of the bed is less likely to reach the other. |
| Warranty | 10 year non-prorated manufacturer's warranty; pair with a supportive foundation to keep it intact. |
Frequently asked questions
How firm is the Sierra Sleep Peak 2.0?
Genuinely firm. There's a layer of high-density memory foam at the surface, but the firm support foam underneath is what you feel: a close, responsive surface rather than a slow sink. It's built for sleepers who want to stay on top of the bed, not in it.
What's inside the Peak 2.0?
An 8 inch tight top build: a high-density memory foam comfort layer under the cover, a thick core of firm support foam underneath carrying most of the height, and a stretch knit cover wrapping the whole mattress.
Is this an all-foam mattress or a hybrid?
All-foam, no coils. The firmness comes from a shallow memory foam layer over a dense support foam core, not springs, which is also why it isolates motion well between two sleepers.
Will the Peak 2.0 work with my adjustable base?
Yes. The all-foam construction is built to flex with a base that raises the head or the feet, so it moves with the frame instead of resisting it.
Do I need a foundation or box spring under it?
A supportive foundation is recommended. Pairing the mattress with one keeps the manufacturer's warranty intact and gives the firm support foam base something solid to rest on.
How long until it's ready to sleep on after unboxing?
Give it up to 48 hours to fully expand once it's out of the box. Like most foam mattresses shipped compressed, it needs that time to reach its full 8 inch height and settle into shape.
Does the Peak 2.0 come with an at-home trial?
No. Sierra Sleep mattresses, including the Peak 2.0, don't include an at-home trial period. Firm is a feel every body reacts to differently, so the honest way to know if it's right for you is to lie down on this exact mattress at one of our Kentucky showrooms before you buy.
What sizes does the Peak 2.0 come in?
Twin, Full, Queen, King, and California King, all built to the same firm, 8 inch tight top spec.
Can I see this mattress in person near me?
Yes, and with a firm mattress that's the smart way to decide. Mattress Overstock is a Kentucky-owned company with showrooms across the state, including Lexington, Georgetown, Somerset, London, and Richmond. Lie down on the actual Peak 2.0 in your own sleeping position, right next to a softer model if you want to compare. Delivery is free across the Kentucky service area with old-mattress haul-away.
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.
