Comfort IQ™ · Scored on what actually matters
SERTA® iComfort® 13″ Plush Memory Foam Mattress — Performance & Feel
Comfort IQ™ scores eight dimensions 0–10 from National Mattress's in-house testing + construction — the same scale on every model, so two beds compare on what actually matters. Results vary by body type, base, and room temperature.
Pressure relief is the headline of the SERTA® iComfort® 13″ Plush Memory Foam Mattress, sinking 2.99 inches in our in-house test — among the deepest-cradling surfaces you can buy. A deep 13 inches of zoned foam wraps the shoulders and hips in a plush 3-out-of-10 cradle, and it stays remarkably still for couples (Motion Isolation 8.5) so one partner moving barely reaches the other. This is a side-and-lighter-sleeper’s mattress through and through — if you sleep on your side and want a deep, enveloping, low-disturbance feel, the iComfort 13″ Plush delivers it in spades.
Performance Scores
An 8.7 overall led by deep pressure relief and near-silent motion isolation; spinal support is the honest soft spot on a plush memory-foam build.
Responsiveness9.7
Livelier than most deep memory beds, though it conforms gradually rather than springing.
Pressure Relief9.4
A 2.99-inch sink, among the deepest cradles for shoulder and hip relief.
Cooling9.5
A graphite-treated foam and CoolFeel cover keep a deep memory build mainstream.
Durability9.1
High-density comfort foam over a high-density core resists early body impressions.
Motion Isolation8.5
Deep foam absorbs a partner's shifts almost completely; no springs to carry energy.
Edge Support8.5
Lying support holds near the seam; sitting on the rim of a deep plush bed gives.
Spinal Support5.2
A deep plush feel for lighter sleepers; heavier and stomach sleepers want firmer.
Off-Gassing 9.0 Brand 8.8 Sleep Trial 10.0 Value 5.4
In National Mattress's in-house Comfort IQ analysis, the iComfort 13″ Plush Memory Foam scores: Overall 8.7/10, Cooling 9.5/10, Pressure Relief 9.4/10, Motion Isolation 8.5/10, Edge Support 8.5/10, Responsiveness 9.7/10, Spinal Support 5.2/10, Durability 9.1/10.
Best For
Side sleepers with shoulder or hip pain Pressure Relief 9.4 and a 2.99-inch sink build the kind of enveloping cradle thin comfort layers cannot reach.
Couples and the lightest sleepers Motion Isolation 8.5 — a partner shifting or getting up is absorbed by the thick foam before it crosses the bed.
Memory-foam fans who want a deep hug the slow-conforming surface melts around you — the immersive feel firmer beds cannot give.
Anyone who hated a noisy innerspring all foam, no metal — completely silent on night one and in year ten.
Buyers who want it to keep its feel Durability 9.1 — high-density foam over a high-density core, behind a 10-year warranty.
Considerations
Spinal support 5.2 a Plush 3/10 memory build lets the hips settle into the soft, immersive surface, so heavier sleepers and stomach sleepers should choose a firmer model for neutral support.
Slow-melt response full recovery sits at the slower end (0.27–4.07 sec.), the signature memory-foam feel — sleepers who want a lively float-on-top surface for easy repositioning should know it leans toward the gradual sink.
Soft sitting edge with no coil rail, a deep soft build gives 4.44–6.50 inches at the perimeter; sleeping near the edge is fine, but the firm usable surface is the center of the bed.
How It Performs — The Measured Detail
Feel & Firmness · 3/10 Plush
A deep, soft 3 out of 10, this is true memory foam: you settle into the surface and it conforms slowly, melting around the body rather than pushing back. The 13-inch build and zoned core give the cradle real depth. If the immersive, hugged sensation is what you are after — not a springy, on-top feel — this is the character you want.
Cooling 9.5
For a deep 13-inch plush memory build with no coils beneath to move air, the iComfort 13″ Plush cools impressively, peaking at 32.4°C in our test within a 30.3–33.0°C range and climbing 8.3–11.0°C over baseline. A CoolFeel cover paired with a graphite-treated foam pulls heat out of the comfort layer itself rather than just off the cover. The honest read is mainstream rather than icy, but for a deep memory-foam hug that is a hard-won result.
Pressure Relief 9.4
This is the bed's defining strength. Set Plush at 3 out of 10, it sinks 2.99 inches in our test — inside a 2.40–3.41 inch range that puts it among the deepest-cradling surfaces available. The memory-foam comfort layer over the contouring core lets shoulders and hips press in and spread their load into a fully enveloped hug. For lighter side sleepers, and anyone with shoulder or hip pain who wants to feel genuinely cradled, this delivers relief firmer beds cannot.
Motion Isolation 8.5
If stillness matters, this bed is excellent. Peak transferred motion measures 1.04–4.33 m/s² and the surface settles within 0.54–0.76 seconds — both near the quiet end. That is deep all-foam construction doing what foam does best: a partner shifting or rolling over is absorbed almost completely by the thick memory-foam layer and dense core before it reaches the other side, with no springs anywhere to carry energy. For couples and the lightest sleepers, about as undisturbed as a surface gets.
Edge Support 8.5
Be candid about the perimeter: this is an all-foam bed, so the edge is held by foam alone with no coil rail to brace it, and edge sinkage measures 4.44–6.50 inches in our test — among the softer perimeters on the floor. That is the natural consequence of a deep, soft 13-inch build: sit on the very side and you feel it give. Sleeping near the edge is fine and lying support holds, but think of the firm usable surface as the center of the bed rather than right out to the seam.
Responsiveness 9.7
For a deep memory-foam bed this one is livelier than you might expect, though honest about its character. Bounce total travel measures 4.59–9.33 inches — decent for an all-foam plush — while the full recovery time, in the 0.27–4.07 sec. band, lands at the slower end, the signature of a true memory-foam feel. You sink in and the surface conforms gradually rather than springing back. That immersive response is exactly what memory-foam fans seek; if you want a lively float-on-top feel, this leans to the slow-melt end.
Off-Gassing 9.0
There is little to break in — the off-gassing clears in under 12 hours. The foams are CertiPUR-US certified, independently tested for low VOCs against strict limits, and the bed is built locally in Ontario and delivered flat rather than vacuum-compressed, so the strong decompression odor boxed memory-foam beds release on first unrolling is largely avoided. Any faint scent on the certified foam clears within a day or two of airing the room, and the build is fiberglass-free.
Sleep Position & Body Weight Fit
Tuned for side sleepers and lighter bodies, who float in the deep cradle and stay aligned. Back sleepers can manage it, but stomach sleepers and heavier bodies will let the hips drop too far into the soft surface (Spinal Support 5.2) for ideal support. Average-weight side sleepers are the core fit; anyone needing firm hip-lift should choose a firmer model.
At a Glance
Type · Foam (memory) Firmness · 3/10 Plush Height · 13″ Comfort layer · 1″ memory foam (zoned) Fiberglass-free CertiPUR-US certified Made in · Canada Trial · 365 nights Delivery · Free on orders over $199
Full construction, per-size dimensions and layer detail are in the product description above. View 365-night trial details.
Frequently Asked
Is the Serta iComfort 13″ Plush Memory Foam good for side sleepers?
Yes — it is one of the best in the lineup for side sleeping. Pressure Relief scores 9.4 with a 2.99-inch sink in our test, so the shoulders and hips press into a deep, enveloping cradle. Lighter side sleepers and anyone with shoulder or hip pain benefit most.
Will my partner's movement wake me on this memory-foam bed?
Unlikely. Motion Isolation scores 8.5, with transfer measured at 1.04–4.33 m/s² and the surface settling in well under a second. The thick all-foam build absorbs a partner shifting or getting up, and there are no springs to carry the energy across.
Is this Serta iComfort too soft for back or stomach sleepers?
For most, yes. At a Plush 3 out of 10 it scores 5.2 for Spinal Support, so heavier hips can settle below the neutral line on the soft, immersive surface. It is built for side sleepers and lighter bodies; back and stomach sleepers should pick a firmer iComfort.
Does the iComfort 13″ Plush sleep hot?
It runs mainstream, not hot. Cooling scores 9.5 and it peaked at 32.4°C in our test — strong for a deep memory build with no coils to vent. A CoolFeel cover and graphite-treated foam pull heat from the surface, though a deep memory hug holds a little more warmth than an airy hybrid.
Can I return the iComfort 13″ Plush if I do not like it?
Yes — it comes with a 365-night sleep trial. A deep memory-foam bed can take several weeks for your body to adapt to the slow-conforming feel, so the full year lets you be sure. If it is not right, return it for a refund or exchange. Delivery is free on orders over $199.
