Sierra Sleep by Ashley
Sierra Sleep iKidz Ocean Mattress and Pillow 2/CN
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The iKidz Ocean earns its spot in a kid's room by doing one job well: it gives a growing sleeper a firm, stable surface that holds up to jumping, wrestling, and years of nightly use, without the soft spots that show up fast on a cheaper kid's mattress. If your child needs a first real mattress that you can trust to hold its shape and that they will actually like the look of, this is a straightforward, well built pick.
Part of Ashley's iKidz Ocean series (model M430), this Sierra Sleep set pairs a memory foam mattress with a matching pillow, so a bedroom refresh does not turn into two or three separate purchases. The mattress runs about 7 inches thick: a memory foam comfort layer sits over a firmer support core, wrapped in a luxury 4 way hyper stretch knit cover printed with the ocean wave pattern that gives the set its name. That knit cover is worth calling out on its own. It stretches and recovers with a kid climbing on and off the bed instead of bunching at the seams or going thin at the corners the way a plain cover can.
Comfort level here is firm, and that is a deliberate choice, not a marketing label. A thin memory foam layer softens the immediate surface at the shoulders and hips, but the support core underneath does the real work, keeping the mattress level under an active sleeper instead of forming the shallow craters that show up quickly on a plush kid's bed. With no coils in the build, the surface stays quiet and stable edge to edge, so a sibling jumping on for story time does not turn into a wobble across the whole mattress.
What's in the box
- Available in Twin and Full sizes
- Feel: firm
- Construction: memory foam over a support core, about 7 inches total height
- Cover: luxury 4 way hyper stretch knit, ocean wave print
- Includes a matching standard pillow
- Ships compressed in a box; give it about 48 hours to fully expand before regular nightly use
- Backed by a 1 year, non prorated warranty
- Foundation or box spring sold separately, matched to the mattress size
Who it fits
Back and stomach sleepers get the most out of a firm mattress like this one, since a level, supportive surface keeps a kid's hips and spine from sinking. It is also a sensible pick for bunk beds, trundles, daybeds, and any room where a lean profile matters more than a tall one. Side sleepers who want a deeper, cushioned feel may find this firmer than expected, and if your child has already told you they want something softer to sink into, this is not that mattress. For most kids in the early elementary years and up, though, firm and supportive is exactly the setup that holds up to how they actually sleep and move.
The best way to know if a firm feel is right for your child is to have them lie down on it. Stop by one of our Kentucky showrooms and let them stretch out on the iKidz Ocean in person before it goes into their room.
What makes this mattress different
A firm feel built for how kids actually sleep
Rated firm, not a softened kids version of firm, so the surface holds a shape under jumping, wrestling, and years of nightly use instead of dipping.
Memory foam over a supportive core
A memory foam comfort layer softens contact at the shoulders and hips while a firmer support core underneath keeps the surface level edge to edge.
Luxury 4 way hyper stretch knit cover
The ocean wave print cover stretches and recovers with an active kid instead of bunching at the seams or wearing thin at the corners.
Compact 7 inch profile
Lean enough for bunk beds, trundles, daybeds, and standard frames, without needing an unusual foundation height.
No coils, no wobble
An all foam build keeps the sleeping surface quiet and stable, so one sibling climbing on does not turn into a shake across the whole bed.
Matching pillow included
A standard size pillow in the same ocean print ships with the mattress, so the set is ready for a full bedroom refresh out of the box.
Ships compressed in a box
Easy to carry into an upstairs bedroom without a delivery crew. Give it about 48 hours after unboxing to fully expand before regular use.
Backed by a 1 year, non prorated warranty
Ashley covers the iKidz Ocean with a full 1 year, non prorated warranty against manufacturing defects.
A simple, firm build made to last through kid years
The iKidz Ocean keeps its construction straightforward: a memory foam comfort layer over a firmer support core, about 7 inches total, with no coils to work loose or squeak under an active sleeper. The top layer takes just enough edge off contact points at the shoulders and hips, while the support core underneath carries most of the height and holds the surface level from edge to edge.
Wrapping the foam is a luxury 4 way hyper stretch knit cover, printed with the ocean wave pattern that gives this set its name. The stretch knit matters more on a kid's mattress than it does on an adult one: it moves with a child climbing on and off the bed instead of bunching at the seams or thinning out at the corners the way a plain woven cover can after a couple of years of daily use.
A matching standard pillow ships with the mattress, and the whole set arrives compressed in a box. Plan on about 48 hours after unboxing for the mattress to fully expand to its true feel before regular nightly use.
See the full Sierra Sleep lineup →Firm support for a growing sleeper
Back sleepers: firm support keeps a kid's hips from sinking and the spine level, the setup most back sleepers rest best on.
Stomach sleepers: this is the position that benefits most from a firm surface. A softer mattress lets the midsection sag; the iKidz Ocean keeps kids level instead.
Active sleepers: kids who jump, wrestle, or use the bed as a trampoline need a surface that holds its shape. The firm support core resists the soft dips that show up fast on a plush kids' mattress.
Bunk beds, trundles, and daybeds: the compact 7 inch profile fits these frames cleanly without needing a taller foundation or an unusual box spring.
Shared rooms with siblings: with no coils in the build, the surface stays quiet and stable, so one kid climbing on does not turn into a shake across the whole mattress.
Probably not for you if: your child specifically wants a soft, plush feel to sink into, since the firm surface and thin comfort layer will feel hard without an added topper, or if they are a dedicated side sleeper who wants deep cushioning at the shoulder and hip.
Specifications
| Height | 7 in |
|---|---|
| Feel | Firm |
| Firmness | Firm, built to resist soft dips under active kids |
| Construction | Luxury 4-way hyper-stretch knit cover over a memory foam comfort layer and a firm support core, about 7 inches total |
| Warranty | 1-year, non-prorated warranty |
Frequently asked questions
How firm is the Sierra Sleep iKidz Ocean Mattress?
Firm, and deliberately so. A memory foam comfort layer softens the immediate surface at the shoulders and hips, but a firmer support core underneath does most of the work, keeping the bed level under an active sleeper instead of forming soft dips over time.
What sizes does the iKidz Ocean come in?
Twin and Full. Both include a matching standard pillow in the same ocean wave print, so either size arrives as a complete set.
Is this a good mattress for an active kid who jumps on the bed?
It holds up better than a plush kids' mattress will. The firm support core is built to resist the soft craters that show up quickly under regular jumping and wrestling, and the all foam build has no coils to work loose or squeak.
Does the iKidz Ocean include a pillow?
Yes. A standard size pillow in the matching ocean wave print ships with the mattress, so you are not shopping separately to round out a new bed.
How long does it take the mattress to expand after unboxing?
The iKidz Ocean ships compressed in a box for easy carrying into upstairs bedrooms. Plan on about 48 hours after unboxing for it to fully expand to its true shape and feel before regular nightly use.
Do I need a foundation or box spring?
Yes, a foundation or box spring is sold separately and should be matched to the mattress size. Ask our showroom team if you are not sure which foundation fits your child's frame.
What warranty does this mattress carry?
Ashley backs the iKidz Ocean with a 1 year, non prorated warranty against manufacturing defects.
Is there an at home trial period on this mattress?
No. Sierra Sleep beds like the iKidz Ocean do not include an at home trial or comfort exchange period. Because every child's feel preference is different, the honest way to know if firm is right for yours is to have them lie down on it before it comes home. Our Kentucky showrooms have this mattress on the floor for exactly that reason.
Can we try this mattress in person before buying?
Yes, and with a kids' mattress that is the better way to decide. Mattress Overstock is a Kentucky owned company with showrooms across the state where your child can lie down on this exact mattress in their own sleeping position before you commit to it for their room.
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.
