This replacement comfort foam layer is the medium-firmness foam that sits on top of the air chambers in a Sleep Number® bed — the layer that gives the surface its feel. It is our closest match to the original regular foam, so it brings an older bed back to how it felt when it was new. Replacing it eliminates body impressions and sagging and restores the supportive, cradling feel, without touching the air chambers, pump, or cover you already own. Made in the USA and CertiPUR-US® tested.
Medium feel
1.8 lb density
35 ILD firmness
1"–4" thickness
CertiPUR-US® tested
Made to order, USA
Have a King Split-Head FlexTop bed? FlexTop is a specialty size — a solid foam layer with a 34" cut at the head so each side raises independently. Shop the correct size in our
FlexTop Split-Head collection →
What this foam feels like
This is a true happy-medium feel: firm, even support without sinking or bottoming out, and without the hard, boardy feeling of a foam that is too firm. At 1.8 lb density and 35 ILD it is the most comparable feel to Sleep Number original regular foam.
If your bed sags or has body impressions and you want to firm it back up, this is the foam most people should choose. It restores solid, even support — and because you have a Sleep Number bed, you can dial the air chambers firmer on top of it for as much added support as you want. That combination is the right call for the large majority of customers firming up a soft bed. Only if you specifically want an extremely hard, board-like surface should you look at our firm regular foam (50 ILD), which most people find too firm for everyday comfort.
Which thickness should I choose?
The thickness you pick sets how much cushioning sits over the air chambers, and it also affects your shell height. Most beds use a 2" or 3" comfort layer.
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Match what you have to keep the same feel and the same shell height — measure your current foam and order the same thickness.
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Go thicker (for example 2" up to 3") for more cushioning, but remember it raises your shell height by the difference, so order a cover to match if you are replacing that too.
Not sure how thickness ties into shell height? Our guide to measuring your Sleep Number bed walks through it, or call us at 610-327-2322.
Specifications
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Feel: medium — closest match to Sleep Number original regular foam
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Density: 1.8 lb
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Firmness: 35 ILD
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Thickness options: 1", 2", 3", or 4"
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Quality: CertiPUR-US® tested
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Made to order in the USA to fit your size and thickness
Compare our Sleep Number foams
All of our comfort foams are made to order in the sizes and heights shown on each product. Here is how the feels compare so you can pick the right one:
| Foam |
Feel |
Firmness |
Best for |
| Soft Regular |
Plush, sink-in |
12 ILD |
Softening a bed that feels too firm |
|
Medium Regular (this page) |
Balanced, original feel |
35 ILD |
Most people; firming up a sagging bed (closest to original) |
| Firm Regular |
Extra-firm, little give |
50 ILD |
Sleepers who want a very hard surface |
| Gel Memory |
Contouring, cooler, sink-in |
Medium (cradle) |
Pressure relief; plush premium feel |
| Latex |
Buoyant, responsive, on-top |
29 ILD (medium) |
Lively support; durable upgrade (not a Sleep Number foam) |
| Egg Crate |
Light cushion + airflow |
35 ILD |
Economical comfort and cooling boost |
Sizes & measurements
Choose your size below and the thickness (1"–4") that matches your bed. The foam lays over the air chambers inside the cover.
| Size |
Foam (W × L) |
| Twin |
38" × 75" |
| Twin XL |
38" × 80" |
| Full |
54" × 75" |
| Split Queen |
30" × 80" (per side) |
| Queen |
60" × 80" |
| Expanded Queen |
66" × 80" |
| King |
76" × 80" |
| RV King |
72" × 80" |
| California King |
72" × 84" |
| Split Cal King |
36" × 84" (per side) |
Will this fit my Sleep Number bed?
Because every layer is made to order, we fit older beds, newer smart-bed models, split and FlexTop setups, and sizes the manufacturer no longer sells — including Split Queen, Expanded Queen, RV King, and Split Cal King. If the foam sides of your bed have also softened, many owners refresh the perimeter at the same time with new foam side rails or the full complete rail set. Building a newer smart-bed model? You can build your own comfort layer instead. Browse everything on our Sleep Number foam & rails page or the full Sleep Number repair parts collection.
Frequently asked questions
What does this foam do?
It is the comfort layer that lays on top of the air chambers and gives the bed its surface feel. Replacing a worn comfort layer removes body impressions and sagging and restores the supportive, cradling feel of a newer bed.
How does this compare to Sleep Number original foam?
It is our closest match to the original regular foam — a medium feel at 1.8 lb density and 35 ILD. It supports you without bottoming out and without feeling hard or boardy.
I want to firm up a sagging bed — is this the right foam?
For most people, yes. This medium foam restores firm, even support and matches the original Sleep Number feel, and you can adjust your air chambers firmer for extra support on top of it. Our firmest foam is an extremely hard, board-like surface that most people find too firm, so for everyday firming-up this medium is the right call.
What thickness should I order?
Match the thickness of your current comfort foam to keep the same feel and shell height; most beds use 2" or 3". Going thicker adds cushioning but raises your shell height by the difference, which matters if you are also replacing the cover.
Is this foam safe and durable?
Yes. It is made in the USA, CertiPUR-US® tested, and built to hold up to daily use.
Will it fit an older or discontinued size?
Yes. Because it is made to order, we can match older, split, and discontinued sizes, including Split Queen, Expanded Queen, RV King, and Split Cal King.
What if the foam is too firm or too soft?
No problem — we offer a 30-day comfort exchange. Return it for a full refund or credit, or keep it and take a one-time 50% off a replacement (most people choose this — nothing to ship back). See our Foam Comfort Exchange & Return Policy for full details.
