This replacement comfort foam layer is the softest foam we offer for a Sleep Number® FlexTop King bed — the layer that sits on top of the air chambers and gives the surface its feel. Soft and plush, it lets your body sink in a little more for a cushioned, pressure-relieving feel. Replacing a worn comfort layer eliminates body impressions and sagging and brings back the comfortable feel your bed once had, without touching the air chambers, pump, or cover you already own. Made in the USA and CertiPUR-US® tested.
FlexTop King
Soft, plush feel
1.5 lb density
12 ILD firmness
1"–4" thickness
CertiPUR-US® tested
What size is this? FlexTop King explained
This is made for the FlexTop King. It is one solid King-size foam layer (76" × 80") with a 34" cut from the center of the head running toward the middle, which lets the two heads of the bed raise independently on a FlexFit adjustable base. Even with that head cut, the foam is a single piece with one uniform feel across the whole surface. Choose your height below.
Is your FlexTop bed built from two separate Twin XL pieces?
Some FlexTop beds use two separate Twin XL foam layers (38" × 80" each) instead of one solid piece with a head cut. If that is how yours is built, order two Twin XL layers from our standard soft regular foam instead. Two separate Twin XL pieces is also the only way to set a different feel on each side of a FlexTop bed. Not sure which you have? Browse our standard foam collection or call us at 610-327-2322.
What this foam feels like
This is the softest, plushest option in our foam line. At 1.5 lb density and 12 ILD it cushions your body and relieves pressure, letting you sink in more than our medium or firm foams. It is the choice if you find your bed too firm or you want a softer, more contouring surface. Prefer a more balanced feel? Our medium regular foam (35 ILD) is the closest match to Sleep Number original foam, and our firm regular foam (50 ILD) is the most supportive.
Which thickness should I choose?
The thickness you pick sets how much foam sits over the air chambers, and it also affects your shell height. Most beds use a 2" or 3" comfort layer. Match the thickness you have now to keep the same shell height, or go thicker for a deeper, more cushioned layer (which 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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Fits: Sleep Number FlexTop King (solid King foam with 34" center head cut)
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Feel: soft and plush — the softest of our foam options
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Density: 1.5 lb
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Firmness: 12 ILD
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Thickness options: 1", 2", 3", or 4"
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Quality: CertiPUR-US® tested, made to order in the USA
Compare our FlexTop King foams
All of these are cut for the FlexTop King. Here is how the feels compare so you can pick the right one:
| Foam |
Feel |
Firmness |
Best for |
|
Soft Regular (this page) |
Plush, sink-in |
12 ILD |
Softening a bed that feels too firm |
| Medium Regular |
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 |
Will this fit my bed?
This is made to order for the FlexTop King split-head configuration. If your bed's foam side rails have also softened, you can rebuild the firm edge at the same time with the FlexTop complete rail set. Browse everything for your bed in our FlexTop Split-Head collection, or see 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 a soft, cushioned surface.
How soft is this foam?
It is the softest option we offer — a plush feel at 1.5 lb density and 12 ILD that lets your body sink in and relieves pressure. It is softer than both our medium and firm foams.
Should I choose soft, medium, or firm?
Choose this soft foam if your bed feels too firm or you want a plush, contouring surface. The medium regular foam (35 ILD) is the closest match to Sleep Number original foam, and the firm regular foam (50 ILD) is the most supportive.
Is this one solid piece or two?
It is one solid King-size piece with a 34" cut at the center of the head so the two heads raise independently, giving one uniform feel. If your bed instead uses two separate Twin XL pieces, order two Twin XL layers from our standard soft foam page.
What thickness should I order?
Match the thickness of your current comfort foam to keep the same shell height; most beds use 2" or 3". Going thicker adds more cushioning but raises your shell height by the difference, which matters if you are also replacing the cover.
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.
