Serta
Serta iComfort Iona Plush 13" Mattress
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The honest verdict: the Iona Plush 13" is the soft, side-sleeper end of the iComfort line. At about a 3 out of 10 it gives your shoulder and hip a real place to sink, the way side sleeping wants, and it does it at 13 inches, so you get the plush iComfort cradle without the height of the 14-inch Aspire Plush. If you sleep on your side and a firmer bed keeps leaving your shoulder sore, but you don't need the tallest model in the line, this is your bed. The trick to a good plush bed is that your waist stays level instead of folding down to chase your hips, and that is the first thing to feel for when you test it.
What it's made of, and what that does for you
- A genuine plush surface, about 3 out of 10. Softer up top than the Iona Medium, so your shoulder and hip settle in instead of pressing against the bed. That's the whole reason to choose the Plush.
- Graphite-infused Perfect Conform memory foam over EverCool gel foam, beneath a cool-to-the-touch CoolFeel cover. The comfort layers cradle pressure points while the graphite, gel, and cover carry heat away, which matters most on a plush surface where softer foam would otherwise trap warmth.
- 5-ZoneResponse support. Firmer under the lumbar and thighs, softer under the shoulders and hips: the reason a soft bed can still keep your spine straight instead of letting you bottom out in the middle.
- A Deep Reaction support core, 13 inches total. The dense base does the structural work and absorbs motion. Thirteen inches dresses easily with standard-depth sheets and most frames.
- CertiPUR-US certified foams, no fiberglass, a 10-year limited warranty, made in the USA. Serta confirms the iComfort line carries no fiberglass fire barrier, the question side-sleepers ask most about all-foam beds, built to the same standards as the rest of the line.
Living with it over time
Give a new all-foam bed about three weeks of use to settle, and expect memory foam to firm slightly in a cool room and soften in a warm one, so the same mattress can read a touch different in January than in July. That is normal, not a defect. Where the build quietly earns its keep is motion: the Deep Reaction core absorbs a shift before it travels, so when the person next to you turns over or climbs out at five in the morning, you tend to sleep through it. A mixed-position couple can still make it work, as long as the side sleeper is the one the soft surface was chosen for. The Iona Plush is also compatible with an adjustable base, so the foam flexes with the frame when you raise the head to read or ease snoring.
Who it's not for, and the team would rather say so now
- Back and stomach sleepers. A 3-out-of-10 plush will likely let your hips dip, and you'll feel it by morning. The Iona Medium 13" is the better fit: same 13-inch build, firmer 5-out-of-10 surface tuned for back and combo sleeping.
- Anyone who wants the deepest possible cradle. This is plush at 13 inches; the 14-inch Aspire Plush stacks an extra inch of comfort foam if you want to sink even further.
- Heavier sleepers, or anyone chasing a cool, springy feel. A plush all-foam bed asks more of its core under more weight, and it hugs rather than bounces. In either case a coil hybrid is the more honest answer, and the team will point you to one.
Why buy it from Mattress Overstock
An independent Kentucky retailer since 2012, with five showrooms you can walk into, no appointment needed, in Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. This is a bed you can come lie on in person before you commit, not just a picture on a screen, and the floor holds roughly a 4.7-star average across more than 500 Google reviews.
"Plush" promises a lot in a product photo and delivers differently to every body. The only way to know if this is your soft is to lie on it in your real side-sleeping position, and the team can set the Plush, the Iona Medium, and the Aspire side by side so a few minutes of switching decides it. Free delivery, free setup, and free removal of your old mattress come standard across the Kentucky service area. And because nobody on the floor earns more for steering you to one brand, if the plush isn't right, you'll hear it.
Come lie down on the Iona Plush at your nearest Kentucky showroom this week. Or select your size to see the live Mattress Overstock price, or browse the full Serta lineup.
What makes this mattress different
A soft 13-inch cradle (3/10)
The plush, side-sleeper feel of the iComfort line at a sensible 13 inches: deep enough for the shoulder and hip without the tallest model's height or price.
Graphite + gel cooling
Graphite-infused Perfect Conform memory foam over EverCool gel foam keeps a soft surface from trapping heat, the cooling tuned for plush where heat likes to hide.
5-ZoneResponse keeps you supported
Firmer under the lumbar and thighs, softer at the shoulders and hips, so the plush surface still holds your spine instead of letting you sink in the middle.
Quiet motion isolation
The all-foam Deep Reaction core absorbs a shift before it crosses the bed, so a partner turning over or leaving early rarely wakes you.
Adjustable-base friendly
The foam flexes with an adjustable frame, so you can raise the head to read or ease snoring without fighting the mattress.
No fiberglass, certified clean
Built with CertiPUR-US certified foams and no fiberglass fire barrier, the question side-sleepers ask most about all-foam beds.
Serta build, made in the USA
A Deep Reaction support core, a 13-inch profile, and a 10-year limited warranty, assembled in the USA to the same standards as the rest of the iComfort line.
Soft up top, zoned underneath: plush that still has your back
The Iona Plush runs the same 13-inch iComfort build as the Iona Medium, tuned softer: a cool-to-the-touch CoolFeel cover, then graphite-infused Perfect Conform memory foam and EverCool gel foam weighted for cushion, then the support layers that keep a soft surface from collapsing into a hammock.
That support is a 5-ZoneResponse layer over a Deep Reaction core: firmer beneath your hips and lumbar, softer beneath your shoulders. It's what lets a 3-out-of-10 bed cradle your shoulder and still hold your spine in line. The same dense core absorbs motion, so a restless partner stays on their side of the bed, and it's built with CertiPUR-US certified foams and no fiberglass.
Want the same plush feel with another inch of comfort foam? That's the 14-inch Aspire Plush. Want this build firmer for back and combo sleeping? The Iona Medium 13" is its twin.
See the full Serta lineup →A side sleeper's cradle, right-sized
Side sleepers: this is the Iona to choose. The soft surface lets your shoulder and hip drop the way side sleeping needs, while the zoned support keeps your spine from bowing. If firmer beds leave your shoulder aching, start here.
Lighter-weight sleepers: if most beds feel hard to you, a plush all-foam surface finally lets you settle in and feel held rather than perched on top.
Couples and light-sleeping partners: the all-foam core soaks up movement before it travels, so one person turning over or getting up early doesn't pull the other out of sleep.
Adjustable-base owners: the foam bends with the frame, so raising the head to read, watch TV, or quiet snoring works without the mattress fighting back.
Value-minded plush seekers: you get the soft iComfort cradle at 13 inches, which also dresses with standard-depth sheets, without paying for the tallest model in the line.
Probably not for you if: you sleep on your back or stomach (the firmer Iona Medium 13" suits you better), you're a heavier sleeper, or you want a cool, springy feel, in which case ask the floor about a hybrid.
Specifications
| Height | 13" |
|---|---|
| Feel | Plush |
| Firmness | 3 out of 10 (10 = firmest) |
| Construction | CoolFeel cover over graphite-infused Perfect Conform memory foam and EverCool gel foam, a 5-ZoneResponse support layer, and a Deep Reaction support core: 13 inches total. |
| Cooling | Graphite-infused Perfect Conform memory foam and EverCool gel foam sit under a cool-to-the-touch CoolFeel cover to draw heat off the surface and keep airflow moving. |
| Motion isolation | Excellent: the all-foam build absorbs movement before it reaches the other side of the bed, so you don't feel a partner shift. |
| Adjustable base | Yes, compatible with adjustable bases |
| Certifications | CertiPUR-US certified foams |
| Warranty | 10-year limited warranty |
| Trial period | 120 days at Mattress Overstock |
Frequently asked questions
How soft is the Serta iComfort Iona Plush 13"?
A genuine plush, about a 3 out of 10, where 10 is firmest. You settle into the surface rather than resting on top of it, while the 5-ZoneResponse support layer keeps that softness from sagging at your hips. Like all memory foam, it firms slightly in a cool room and softens in a warm one.
Who is the Iona Plush best for?
Side sleepers, first and foremost: the soft surface gives your shoulder and hip somewhere to go. It also suits lighter-weight sleepers who find most beds too firm. Back and stomach sleepers usually want more support; the Iona Medium 13" is the better match there.
Does the Iona Plush contain fiberglass?
No. Serta confirms the iComfort line uses no fiberglass, and its foams are CertiPUR-US certified, tested for content, emissions, and durability. That is the question we hear most about all-foam beds, so the short answer is: nothing to unzip, nothing to worry about with the cover.
Is it memory foam or a hybrid?
All-foam memory foam, no coils. It layers graphite-infused Perfect Conform memory foam and EverCool gel foam over a Deep Reaction support core, 13 inches in total. That build is what gives it the close, pressure-relieving cradle and the quiet motion isolation. If you want the bounce and airflow of coils, ask us about a hybrid.
How is it different from the Aspire Plush 14"?
Same soft, side-sleeper idea, one step down in height. The Iona Plush is 13 inches; the Aspire Plush 14" adds an inch of comfort foam for an even deeper cradle. If you want maximum sink, go taller; if 13 inches and a friendlier price suit you, this is the one.
Iona Plush or Iona Medium?
Same 13-inch build, different surface. The Plush (this one) is the soft 3/10 for side sleepers; the Iona Medium 13" is the balanced 5/10 for back and combo sleepers. Lie on both for a minute and your body picks.
Will a plush memory-foam bed sleep hot?
Soft foam is where heat likes to hide, which is why this one runs graphite-infused Perfect Conform and EverCool gel foams under a cool-to-the-touch cover. It sleeps cooler than most plush all-foam beds, but if overheating is your biggest issue, a coil hybrid breathes more, and we'll show you one.
Does it work on an adjustable base?
Yes. The all-foam build is adjustable-base friendly, so it flexes with the frame when you raise the head or foot. It also sits fine on a platform, slatted, or box-spring foundation. A plush bed in particular pairs well with an adjustable base for reading or easing snoring.
How do delivery and the comfort guarantee work?
We deliver across Kentucky with our own team, usually next business day when your size is in stock, and we haul the old mattress away. You also get a 120-day comfort guarantee: if the feel isn't right, exchange it for store credit toward any bed of equal or greater value (no cash refund). Give a new foam bed about three weeks to settle first.
Can I see this mattress in person near me?
Yes, and with a mattress, we'd always rather you did. Mattress Overstock is a Kentucky-owned company that has served the state since 2012, with five showrooms you can visit: Lexington (on Nicholasville Road), Georgetown, Somerset, London, and Richmond. Come lie on this exact mattress in your own sleeping position before you decide. We deliver free across our Kentucky service area and haul your old mattress away, and because everyone on our 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.
