Serta
Serta iComfort Iona Medium 13" Mattress
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The honest verdict — the Iona Medium 13" is the iComfort line's sensible middle: the same cool, zoned memory-foam feel Serta built its name on, in a 13-inch build that fits more bed frames — and more budgets — than the taller models. It's a true medium (about 5 out of 10), so you get the contouring hug without sinking into a hole, while the zoned support keeps your lower back from dropping. If you want the iComfort experience and don't need the extra inch of cushion the Aspire stacks on top, this is the smart place to land.
What it's made of — and what that does for you
- Graphite-infused Perfect Conform memory foam over EverCool gel foam. The comfort layers contour to your shoulders and hips while the graphite and gel pull heat off the surface — the reason this sleeps cooler than the memory foam most people remember from a decade ago.
- A cool-to-the-touch CoolFeel cover. The surface feels cool the moment you lie down. (Straight talk: that first cool-touch fades as you warm it — the cooling that lasts comes from the gel and graphite foams underneath.)
- 5-ZoneResponse support. Tuned firmer under your lower back and thighs, softer under your shoulders and hips, so a medium surface still holds your spine in a straight line instead of letting your midsection sink.
- A Deep Reaction support core, 13 inches total. The dense base carries the support and absorbs motion, so a restless partner doesn't pull you out of sleep. Thirteen inches suits most standard frames and standard-depth sheets — easier to dress than the 14-inch models.
- CertiPUR-US certified foams, a 10-year warranty, made in the USA. The same Serta build standards and certifications as the rest of the iComfort line.
Who it's not for — and we'd rather say so now
- If you want a deeper, plusher cushion — the Iona Medium is balanced, not pillowy. Side sleepers who want a deep cradle should look at the softer Iona Plush 13", or step up to the 14-inch Aspire Medium for an extra inch of comfort foam.
- If you want a springy, "on top" feel — this is memory foam: it hugs and absorbs rather than bouncing back. If you'd rather sleep on the bed than in it, a coil hybrid is the better match.
- If extreme heat is your number-one issue — it cools well for an all-foam bed, but coils simply breathe more. If you wake up overheating most nights, we'll steer you to a hybrid instead.
Why buy it from Mattress Overstock
Locally owned and serving Kentucky since 2012 — with five showrooms you can actually walk into, 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.
Thirteen inches versus fourteen, medium versus plush — these are differences you settle in two minutes lying down and never settle reading specs. Come feel the Iona against the rest of the line at any of our five Kentucky showrooms. You get a full 120-day comfort guarantee; if it's not right, you exchange it for store credit toward any bed of equal or greater value — no cash refund, but no restocking-fee games either. Free local delivery, and we haul your old mattress away. And no one on our floor is paid more to point you at one brand over another — so the advice you get is about your back, not our margin.
See how it stacks up in the full Serta lineup, then come lie down. Two minutes on the Iona next to the Aspire tells you whether the extra inch is worth it to you.
What makes this mattress different
The right-sized iComfort medium
A true 5-out-of-10 feel in a 13-inch build — the cool, zoned memory-foam experience Serta is known for, sized for most frames and budgets.
Graphite + gel cooling
Graphite-infused Perfect Conform memory foam over EverCool gel foam, under a cool-to-the-touch cover — built to fight the heat older memory foam was infamous for.
5-ZoneResponse support
Firmer under the lumbar and thighs, softer at the shoulders and hips, so the medium surface still keeps your spine straight.
Serta build, certified clean
A Deep Reaction support core, 13-inch profile, CertiPUR-US certified foams, and a 10-year limited warranty. Made in the USA.
The iComfort recipe at 13 inches — cool foams up top, zoned support underneath
From the top: a cool-to-the-touch CoolFeel cover, then graphite-infused Perfect Conform memory foam and EverCool gel foam doing the contouring and the cooling, then the support layers that keep a medium feel from going soft in the middle.
The structure comes from a 5-ZoneResponse layer over a Deep Reaction support core — firmer beneath your hips and lumbar, gentler beneath your shoulders. That zoning is why the Iona can feel like memory foam and still sleep flat and supported instead of hammocking.
The Iona sits one step below the 14-inch Aspire Medium in the line — same family feel, an inch less comfort foam. Want this exact build softer for side sleeping? That's the Iona Plush 13".
See the full Serta lineup →The everyday medium, sized sensibly
Back and combination sleepers — a true medium over zoned support is the most forgiving setup for people who don't stay in one position all night. You get contouring without losing the support your back needs when you roll over.
Shoppers who want iComfort without the premium tier — the Iona delivers the line's signature cool, zoned memory-foam feel at 13 inches. If the 14-inch Aspire is more bed (and more budget) than you need, this is the sensible pick.
Couples — the all-foam build keeps one person's movement from traveling across the bed, so a partner's late night doesn't become yours.
Probably not for you if — you're a dedicated side sleeper who wants a deep cradle (see the Iona Plush 13"), or you want the bounce and airflow of coils (ask about a hybrid).
Specifications
| Height | 13" |
|---|---|
| Feel | Medium |
| Firmness | 5 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 firm is the Serta iComfort Iona Medium 13"?
A true medium — about 5 out of 10, where 10 is firmest. You feel a memory-foam cradle at the surface with enough zoned support underneath to keep your back from sinking. Like any memory foam, it firms up a little in a cool room and softens in a warm one, so give it a few minutes to settle.
Is the Iona 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 feel and the quiet motion isolation. If you want the bounce and airflow of coils, ask us about a hybrid.
How is the Iona different from the Aspire?
The Iona is the 13-inch step in the line; the Aspire Medium 14" adds an inch of comfort foam on top of the same family feel. Same cooling, same zoned support — the Aspire just gives a touch more cushion. Lie on both and decide whether the extra inch is worth it to you.
Iona Medium or Iona Plush?
Same 13-inch build, different surface. The Medium (this one) lands at a balanced 5/10; the Iona Plush 13" is tuned softer for side sleepers who want a deeper cradle. Most shoppers can feel the right one within a minute.
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 before judging it.
Will 13 inches fit my frame and sheets?
Thirteen inches works with most standard bed frames and standard-depth fitted sheets — it's a little easier to dress than the 14-inch models. If your frame sits high or your sheets run shallow, measure first; we're happy to sanity-check your setup before delivery.
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.
