Sierra Sleep by Ashley
Sierra Sleep Peak 2.0 Bonnell Mattress
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Verdict: the Peak 2.0 Bonnell is Sierra Sleep's straightforward take on a traditional innerspring bed. If you want the classic coil feel your parents' mattress had, minus the sag, at a genuinely accessible price, this is the one to lie down on first.
The build starts with a Hyper Cool 4-way stretch knit cover, chosen to pull heat off the surface rather than trap it against your skin. Underneath, a memory foam layer sits right where your lower back needs it, cushioning the lumbar area before a firming support pad spreads your weight evenly across the mattress. The support underneath is a Bonnell coil unit, the interconnected coil design that has anchored budget and mid tier innerspring beds for decades, and it rests on a base support foam layer that keeps the whole unit stable over time. All of it comes to 8 inches, a genuinely low profile that fits bunk beds, daybeds, trundles, and most adjustable bases without a second thought.
Feel and support
Ashley rates the Peak 2.0 Bonnell a medium comfort level, and it reads true to that description: enough give at the memory foam layer to soften pressure at the shoulders and hips, enough coil support underneath that you settle onto the bed rather than into it. It is a more responsive, bouncier feel than an all foam mattress, closer to what most people picture when they hear the word mattress. Because the coils are interconnected rather than individually pocketed, movement on one side of the bed is more noticeable on the other than it would be on a pocketed coil or foam design, worth knowing if you share the bed with a restless sleeper.
Who it suits
- Back and side sleepers who want a true medium feel without paying hybrid prices
- Guest rooms, kids' rooms, and bunk beds, where the 8 inch profile and lighter weight make sense
- Shoppers who grew up on innerspring beds and want that familiar coil support again
- Adjustable base owners looking for a low profile mattress that still flexes cleanly
Who should skip it
If you sleep hot and want a deep memory foam hug, or if motion transfer from a partner is your top complaint, look at one of our hybrid or all foam Sierra Sleep models instead. The Peak 2.0 Bonnell is built to be a dependable, well priced innerspring, not a plush specialty bed.
The mattress ships compressed in a box and typically needs up to 48 hours to fully expand once it is unboxed and placed on its foundation (box spring or foundation sold separately). It carries a 10 year non prorated limited warranty, and it is available in Twin, Full, Queen, King, and California King. This is the Peak 2.0 Bonnell, Ashley model M201, and the fastest way to know if a classic coil feel is right for you is to lie on it yourself. Come test it at any of our Kentucky showrooms.
What makes this mattress different
A genuine Bonnell coil core
Interconnected steel coils give this mattress the classic, responsive innerspring support that all-foam beds do not replicate.
Memory foam right at the lumbar
A dedicated memory foam layer sits where your lower back rests, easing pressure without turning the whole surface soft.
Hyper Cool stretch knit cover
A 4-way stretch knit cover is built to move heat away from the body instead of trapping it against the skin.
Firming support pad for even weight distribution
A dedicated support pad sits between the comfort layer and the coils, spreading your weight so the bed resists soft spots over time.
Low 8 inch profile
At just 8 inches tall, this mattress fits bunk beds, daybeds, trundles, and most adjustable bases without special hardware.
10-year non-prorated warranty
Ashley backs the Peak 2.0 Bonnell with a full 10-year non-prorated limited warranty, no depreciating coverage schedule to track.
Adjustable base compatible
The coil and foam build flexes cleanly on an adjustable base if you like to raise your head or feet.
An honest, accessible price point
Built as a straightforward innerspring rather than a hybrid or specialty foam bed, so you are not paying for features you do not need.
A classic coil build, layered for comfort where you need it
The Peak 2.0 Bonnell keeps the recipe simple: five layers, each doing one job, stacked to 8 inches total. At the surface is a Hyper Cool 4-way stretch knit cover, woven to move heat away from your body rather than hold it against your skin. Just beneath it, a memory foam layer is positioned specifically for lumbar support, softening the surface where your lower back needs the most relief.
Below the comfort layers, a firming support pad spreads your weight evenly across the mattress before you reach the heart of the build: a true Bonnell coil unit. Bonnell coils are interconnected in a continuous wire pattern, the same basic design that has supported innerspring beds for generations, and here it provides the springy, responsive push back that all-foam mattresses cannot match. A base support foam layer sits underneath the coils, anchoring the unit and keeping it stable over time.
Want more cushioning on top of a similar coil feel, or a hybrid with pocketed coils instead? Ask the floor team about the rest of the Sierra Sleep lineup.
See the full Sierra Sleep lineup →The classic coil feel, in a low profile
Back sleepers: the medium comfort level and coil support keep your spine level without letting the middle of the bed sag.
Side sleepers who like some bounce: the memory foam layer at the lumbar eases pressure at the shoulder and hip while the coils still push back, a different feel than sinking into all-foam.
Kids' rooms, guest rooms, and bunk beds: the 8 inch profile and lighter weight make this an easy fit anywhere a tall or heavy mattress would be overkill.
Shoppers who grew up on innerspring beds: if you have always preferred the responsive push of coils over the hug of foam, this is the familiar feel you are looking for.
Adjustable base owners: the coil and foam build flexes cleanly if you like to raise your head or feet.
Probably not for you if: you and a partner are both light sleepers who wake at every movement (interconnected Bonnell coils transfer more motion than pocketed coils or foam, ask the floor about a hybrid instead), or you want a deep memory foam hug rather than a springy coil feel.
Specifications
| Height | 8" |
|---|---|
| Feel | Medium |
| Firmness | Medium comfort level (Ashley's official rating; no numeric firmness scale published for this model) |
| Construction | Hyper Cool 4-way stretch knit cover over a memory foam comfort layer, a firming support pad, a Bonnell coil support unit, and a base support foam layer: 8 inches total. |
| Cooling | A Hyper Cool 4-way stretch knit cover sits at the surface to pull heat away from the body, helping keep the sleeping surface temperature regulated through the night. |
| Warranty | 10-year non-prorated limited warranty |
Frequently asked questions
How firm is the Sierra Sleep Peak 2.0 Bonnell?
Ashley rates it a medium comfort level. You get a memory foam layer at the lumbar for pressure relief, sitting on top of a true Bonnell coil unit for springy, traditional innerspring support. It is a middle-of-the-road feel, not a plush bed and not a firm one.
Is this a memory foam mattress or an innerspring?
It is a coil mattress at its core. A Bonnell coil unit provides the support, with a thin memory foam layer and a firming support pad above it for comfort. If you want an all-foam or hybrid feel instead, ask the floor team about other Sierra Sleep models.
What does "Bonnell coil" mean?
Bonnell coils are hourglass-shaped steel springs connected to each other in a continuous wire pattern. It is the oldest and most common coil design in innerspring mattresses, valued for durability and a responsive, bouncy feel.
Will I feel my partner move around at night?
More than you would on a pocketed coil or all-foam mattress. Because Bonnell coils are interconnected, movement on one side of the bed carries more noticeably to the other. If motion isolation is a priority for you, ask about a hybrid or foam model on our floor.
How tall is this mattress, and what bed frames does it fit?
8 inches, a genuinely low profile. It works well on platform beds, bunk beds, daybeds, trundles, and most adjustable bases, and it needs a box spring or foundation, which is sold separately.
Does it work on an adjustable base?
Yes. The coil and foam build is adjustable base compatible and flexes cleanly if you like to raise your head or feet.
What is the warranty?
Ashley backs the Peak 2.0 Bonnell with a 10-year non-prorated limited warranty. Note that pairing the mattress with a foundation from a different brand can affect warranty coverage, so ask the floor team if you are mixing brands.
Does Mattress Overstock offer an at-home trial on this mattress?
No. Sierra Sleep beds, including the Peak 2.0 Bonnell, do not come with an at-home trial period. The place to test the coil feel is in one of our Kentucky showrooms, where you can lie on this exact mattress in your own sleeping position before you decide.
Can I see this mattress in person near me?
Yes, and with a coil mattress like this one, feeling the bounce for yourself matters. Mattress Overstock is a Kentucky-owned company with showrooms in Lexington, Georgetown, Somerset, London, and Richmond. Come lie on the Peak 2.0 Bonnell before you buy, and because everyone on the floor is paid the same no matter which brand you choose, the guidance you get is honest.
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.
