Sierra Sleep by Ashley
Sierra Sleep Hybrid 1400 Mattress
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The verdict: the Hybrid 1400 is for sleepers who want a genuinely plush, contouring surface with coils underneath doing the heavy lifting, rather than a mattress that goes soft on top and stays soft all the way down. If you have been sleeping on an old innerspring that sags in the middle, or a memory foam bed that feels like it is swallowing you whole, this hybrid splits the difference: a cushioned top layer over real coil support. If you sleep hot and want a firm, minimal give surface, keep looking further down the Sierra Sleep line.
How it's built
- A soft, four way stretch cover that moves with you instead of pulling or bunching through the night
- A quilted comfort system built from Laytec foam over high-density response memory foam, layered for an immediately plush top hand
- A high-density whisper foam transition layer that eases the shift from soft foam to firmer coils below
- 720 individually wrapped support coils (15 gauge), the core doing the real structural work of keeping your spine level
- Ashley Edge: a steel encased perimeter with two reinforced rows of 13 gauge wrapped coils, so the edge of the mattress holds its shape under weight
- A base support foam layer anchoring the whole build at roughly 14 inches total
Ashley rates the Hybrid 1400's comfort level as ultra plush, and the construction backs that up. The Laytec and response memory foam layers on top are meant to cradle the shoulders and hips on first contact, the kind of immediate softness side sleepers notice right away. What keeps this from turning into a bed you sink into and stay in is the wrapped coil core underneath: individually wrapped coils respond and release faster than foam, so the plush top does not collapse into a hammock in the middle of the night. The reinforced Ashley Edge perimeter matters here too. On a lot of plush mattresses the edge is the first place that gives out, leaving you sleeping in the center third out of habit. Here the coil edge holds up, so sitting on the side of the bed or sharing a smaller size does not mean losing usable surface.
Feel and support
Side sleepers should feel the most immediate benefit: the plush top layers relieve pressure at the shoulder and hip before the coils take over underneath. Back sleepers get a softer first touch than a medium or firm bed, with the coil core still keeping the hips from sinking too far. Stomach sleepers and larger sleepers who want more support than cushioning are the group most likely to find this one runs soft for their needs; the coils help, but an ultra plush comfort layer is not built for a firm, on top of the bed feel. Couples should notice reasonable motion isolation for a hybrid, since individually wrapped coils flex independently instead of moving as one connected unit.
Who should skip it
If you specifically want a firm, minimal sink surface, this is not the pick. And if you run warm at night, know that a deep plush comfort layer traps more heat than a leaner foam stack does, even with a breathable cover and coils underneath helping airflow.
The Hybrid 1400 is part of Ashley's Sierra Sleep collection, model M437, backed by a 10 year non prorated warranty and compatible with adjustable bases. It's available in Queen and California King. The only real way to know if an ultra plush hybrid is your kind of plush is to lie down on it. Come feel the Hybrid 1400 at any of our Kentucky showrooms before you decide.
What makes this mattress different
720 individually wrapped support coils
A coil core built from 720 individually wrapped 15 gauge coils sits underneath the comfort layers, keeping the plush top from turning into a slow sinking hammock.
Ashley Edge reinforced perimeter
A steel encased edge with two rows of reinforced 13 gauge wrapped coils keeps the perimeter of the mattress from collapsing under weight, so you get more usable sleeping surface and a sturdier seat on the side of the bed.
Ultra plush quilted comfort layer
Ashley rates the Hybrid 1400 as ultra plush, and the quilted top layer of Laytec foam over high-density response memory foam delivers that soft, immediate contour at first touch.
High-density whisper foam transition
A whisper foam layer sits between the plush comfort foam and the coil core, easing the transition from soft surface to firmer support underneath.
Four-way stretch cover
The cover is built to stretch in every direction, so it moves with you through the night instead of pulling tight or bunching up.
10-year non-prorated warranty
Ashley backs the Hybrid 1400 with a full 10-year non-prorated warranty against manufacturing defects.
Adjustable base compatible
The hybrid construction is built to flex, so it works on platform beds, standard foundations, and adjustable bases without fighting the mechanism.
Two sizes, same plush hybrid feel
Available in Queen and California King, both built to the same ultra plush comfort layer over coil support.
An ultra plush top layered over real coil support
The Hybrid 1400 runs a four layer build: a four way stretch cover on top, then a quilted comfort system of Laytec foam and high-density response memory foam for that ultra plush first touch, then a high-density whisper foam transition layer, all sitting over a core of 720 individually wrapped 15 gauge coils reinforced at the edge with Ashley Edge.
The plush feel comes from the depth of the comfort layers up top, not from a soft, unsupported base. Underneath the cushioning, the wrapped coil core is doing the structural work: keeping your spine level, resisting the hip drop a soft all foam bed can allow, and responding faster than foam alone when you roll over. Ashley Edge reinforces the coil perimeter specifically so the edge does not go soft the way an unreinforced border does after a year or two of sitting down to get dressed.
At roughly 14 inches total, it is tall enough to carry a genuine plush comfort layer without losing the coil support underneath. If ultra plush is more cushion than you want, the Peak 2.0 12 Hybrid runs medium firm on a similar coil and foam construction.
See the full Sierra Sleep lineup →Built for sleepers who want a soft top and real support underneath
Side sleepers: the plush comfort layers cradle the shoulder and hip on contact, which is exactly where side sleepers need the give.
Back sleepers: you get a softer first touch than a medium bed, and the coil core still keeps the hips from sinking too far out of line.
Combination sleepers: individually wrapped coils respond faster than foam when you roll over, so changing positions through the night feels less like fighting the mattress.
Couples and shared beds: wrapped coils flex on their own, so motion from one side of the bed is less likely to carry across to the other.
People coming off an old sagging innerspring: the plush top and reinforced coil edge solve the two things that usually go first on a worn out bed: cushioning and edge support.
Probably not for you if: you specifically want a firm, minimal sink surface (the coils help, but an ultra plush comfort layer is not built to feel firm), or you run hot at night, since a deep plush layer holds more warmth than a leaner foam stack.
Specifications
| Height | 14 in |
|---|---|
| Feel | Ultra Plush |
| Firmness | Ultra plush, a soft and contouring feel with coil support underneath |
| Construction | Four-way stretch cover over a quilted Laytec foam and high-density response memory foam comfort layer, a high-density whisper foam transition layer, and an individually wrapped 15-gauge coil support core with Ashley Edge reinforcement: 14 inches total. |
| Motion isolation | Good for a hybrid: individually wrapped coils flex on their own instead of moving as a connected unit, cutting down on motion transfer across the bed. |
| Warranty | 10-year non-prorated warranty |
Frequently asked questions
How firm is the Sierra Sleep Hybrid 1400?
Ashley rates the comfort level as ultra plush. You get a soft, cushioned surface at first touch from the quilted foam layers on top, while the wrapped coil core underneath keeps you from sinking in too far or too fast. It reads as a genuinely soft bed with real support underneath it, not a firm or medium feel.
Is this a hybrid or an all-foam mattress?
It is a hybrid. A quilted comfort system of Laytec foam and high-density response memory foam sits over a high-density whisper foam transition layer, all on top of a core of 720 individually wrapped 15 gauge coils. That coil core is what gives it responsive support underneath the plush top.
What is Ashley Edge and why does it matter?
Ashley Edge is the steel encased, reinforced coil perimeter around the outside of the mattress, built from two rows of 13 gauge wrapped coils. It keeps the edge of the bed from collapsing under weight, so you get more usable sleeping surface and a sturdier seat when you sit on the side of the bed.
Will I feel my partner move during the night?
Less than you would on an old connected innerspring. The coils in the Hybrid 1400 are individually wrapped, so each one flexes on its own instead of moving as a single unit, which cuts down on motion carrying across the bed. It will not be as quiet as an all foam mattress, but it is a real step up from a traditional coil system.
Can I use this mattress with an adjustable base?
Yes. The hybrid construction is built to flex, so it works on platform beds, standard foundations, and adjustable bases.
What sizes does the Hybrid 1400 come in?
Queen and California King, both built to the same ultra plush comfort layer over the same coil support core.
Does Sierra Sleep offer an at-home trial on this mattress?
No. Sierra Sleep mattresses, including the Hybrid 1400, do not come with an at-home trial period. The straightforward way to know if an ultra plush feel is right for you is to lie down on it at one of our Kentucky showrooms before you buy, ideally right next to a firmer Sierra Sleep model so you can feel the difference directly.
Can I see this mattress in person near me?
Yes, and with a mattress that is always the better way to decide. Mattress Overstock is a Kentucky owned company with showrooms across the state where you can lie on this exact mattress in your own sleeping position before you commit. Everyone on the floor is paid the same no matter which brand you choose, so 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.
