Sierra Sleep by Ashley
Sierra Sleep Terra Sleep Medium Mattress
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The Sierra Sleep Terra Sleep Medium earns its name honestly: a genuine medium feel built on a hybrid frame, for sleepers who want cushioning at the shoulders and hips without sinking past the point of support. If you have been bouncing between an all foam bed that traps you and an old spring set that fights back, this is the middle ground Ashley built the Terra Sleep line to hold.
The Build
Start at the top: a luxury 4 way stretch knit cover, woven with REPREVE recycled polyester made from reclaimed plastic bottles, gives the surface a smooth, durable hand that moves with you instead of bunching. Underneath sits the layer that does the real work, FSC Certified Natural Talalay latex, tapped from responsibly managed forests and processed into a comfort layer that cushions pressure points without the slow, dense sink of memory foam. Latex responds quickly and evenly, so it contours under your hips and shoulders and releases just as fast when you roll over.
Below the latex, a power packed wrapped coil support core carries the structural load. Ashley Edge technology reinforces the coil perimeter, so the mattress holds its shape at the edge instead of collapsing when you sit down to tie your shoes, and it helps cut down on motion transfer if you share the bed. A base support foam layer sits beneath the coil unit for a stable foundation, and the whole assembly stands 12 inches tall, the profile Ashley engineers into the Terra Sleep Medium to keep the latex and coils working together rather than one layer overpowering the other.
Feel and Support
This is a true medium: enough give at the surface to let your shoulder settle in on your side, enough coil support underneath to keep your hips from dropping out of line on your back. The wrapped coils move independently under pressure points instead of transferring every shift across the bed, and the build works with an adjustable base if you want to raise your head or feet.
Who It Suits
Back and side sleepers tend to do best here. The medium feel gives shoulders and hips somewhere to sink while the coils keep the spine level. Combination sleepers who move through the night usually like it too, since latex responds to a position change right away rather than making you wait for foam to release. If you run warm at night, a latex comfort layer breathes more than dense memory foam, so heat has somewhere to go instead of building up under you.
Skip it if you already know you need a firm, stay on top feel. The latex layer here is built to cushion, not resist. And if you have never slept on latex before, it is worth feeling in person: it has a springier, more responsive contour than memory foam, a difference some sleepers love and others do not expect.
Series: Terra Sleep Medium, Ashley model M523. Backed by Sierra Sleep's 10 year non prorated warranty. Available in Queen, King, and California King.
The only real way to know how latex and coils feel under your own body is to lie down on one. Come test the Terra Sleep Medium in person at any of our Kentucky showrooms and feel the difference for yourself.
What makes this mattress different
A true medium, not a marketing medium
Built to land in the actual middle of the firmness scale, cushioning the shoulders and hips without losing the coil support underneath.
FSC Certified Natural Talalay latex
A 100% natural rubber comfort layer sourced from responsibly managed forests, chosen for its quick, even response instead of the slow sink of memory foam.
Wrapped coil support core
Individually wrapped coils carry the structural load beneath the latex, keeping the spine level while the top layer handles pressure relief.
Ashley Edge perimeter reinforcement
Edge support technology reinforces the coil perimeter so the mattress holds its shape when you sit down, and helps limit motion transfer across the bed.
REPREVE recycled polyester cover
The 4-way stretch knit cover is woven with REPREVE, fiber made from reclaimed plastic bottles, for a smooth surface with a lower environmental footprint.
12-inch hybrid profile
Tall enough to let the latex and coil layers each do their job, without the bulk that makes sheets and adjustable bases harder to work with.
Adjustable base compatible
The wrapped coil construction is built to flex with a base that raises the head or feet, not just a flat platform or foundation.
Backed by a 10-year warranty
Sierra Sleep covers the Terra Sleep Medium with a non-prorated warranty for a decade, standard across the Sierra Sleep by Ashley line.
Talalay latex over wrapped coils, in that order for a reason
The Terra Sleep Medium starts with a luxury 4-way stretch knit cover woven with REPREVE recycled polyester, a smooth surface built to move with you instead of bunching up. Underneath is the layer that sets this mattress apart: FSC Certified Natural Talalay latex, tapped from responsibly managed forests. Latex compresses and rebounds faster than memory foam, so it cushions your shoulders and hips on contact and releases just as quickly when you change positions.
Below the latex sits a power packed wrapped coil support core, reinforced at the perimeter with Ashley Edge technology to hold its shape at the edge and help cut down on motion transfer. A base support foam layer anchors the coil unit from below. The whole build stands 12 inches tall, tuned so the latex and coils share the work instead of one layer overpowering the other.
See the full Sierra Sleep lineup →Built for sleepers who want cushion without losing support
Back sleepers: the wrapped coil core keeps your hips level while the latex layer cushions the lower back, a combination that suits most back sleepers well.
Side sleepers: latex gives at the shoulder and hip quickly, relieving the two pressure points that make a mattress feel too firm on your side.
Combination sleepers: because latex responds immediately instead of slowly recovering like memory foam, it keeps up as you move between positions through the night.
Couples: the wrapped coil unit with Ashley Edge reinforcement is built to limit motion transfer, so a partner shifting or getting up is less likely to wake you.
Sleepers who run warm: latex is naturally more breathable than dense memory foam, so it does not trap heat the same way.
Probably not for you if: you need a firm, stay on top feel, or you have never tried latex and are unsure about its springier, more responsive contour compared to memory foam. Feel it in person before you decide.
Specifications
| Height | 12 in |
|---|---|
| Feel | Medium |
| Firmness | Medium, true middle of the firmness scale |
| Construction | 4-way stretch knit cover with REPREVE recycled polyester, FSC Certified Natural Talalay latex comfort layer, wrapped coil support core with Ashley Edge perimeter reinforcement, base support foam layer: 12 inches total. |
| Motion isolation | Individually wrapped coils with Ashley Edge perimeter reinforcement are built to reduce motion transfer between sleepers. |
| Warranty | 10-year non-prorated warranty from Sierra Sleep |
Frequently asked questions
How firm is the Sierra Sleep Terra Sleep Medium?
It sits at a true medium, cushioning the shoulders and hips at the surface while the wrapped coil core keeps the spine supported underneath. It is not a plush, deep sink bed and it is not a firm, stay on top bed either, it is built to land in the middle.
What is Talalay latex, and how is it different from memory foam?
Talalay latex is a natural rubber foam processed from latex tapped out of rubber trees. Unlike memory foam, which slowly conforms and slowly releases, latex responds and rebounds quickly, so it cushions pressure points on contact and springs back as soon as you move.
Is this a hybrid mattress?
Yes. A Talalay latex comfort layer sits over a wrapped coil support core reinforced with Ashley Edge perimeter technology, with a base support foam layer beneath the coils. It stands 12 inches tall.
Will it work with my adjustable base?
Yes, the wrapped coil build is compatible with adjustable bases that raise the head or feet, as well as flat platforms and foundations.
Does it sleep hot?
Latex is naturally more breathable than dense memory foam and does not trap heat the way slower responding foams can. Sleepers who run warm generally find it cooler than an all foam bed of similar firmness.
What sizes does the Terra Sleep Medium come in?
Queen, King, and California King.
What is the warranty on this mattress?
Sierra Sleep backs the Terra Sleep Medium with a 10 year non prorated warranty.
Is there an at-home trial on this mattress?
No, Sierra Sleep beds do not come with an at-home trial. The honest way to know if the feel is right for you is to try it in person: our Kentucky showrooms have the Terra Sleep Medium on the floor so you can lie down on it in your own sleeping position before you buy.
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.
