This replacement latex comfort layer is a premium upgrade foam for a Sleep Number® FlexTop King bed — the layer that sits on top of the air chambers and gives the surface its feel. It is 100% natural Dunlop latex: a buoyant, responsive natural rubber that supports you on top of the mattress rather than letting you sink in. It is hypoallergenic and anti-microbial, and its aerated structure breathes well — keeping you warmer in winter and cooler in summer — for excellent support and pressure relief. Because natural latex is a higher-quality material than standard poly foam, you can expect a longer life from it. Made in the USA.
FlexTop King
100% natural Dunlop latex
Medium feel (29 ILD)
Buoyant & responsive
1"–3" thickness
Long-lasting
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 latex 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
Latex is buoyant and responsive. It does not let you sink in the way memory foam does — the best way to describe it is the feeling of lying on top of your mattress instead of down inside it. Because it springs back quickly, it adjusts as you move, so changing position and turning over takes less effort. At 29 ILD it is a medium firmness, very close to our medium regular foam (35 ILD) — most people who want that medium feel like both foams, and it comes down to the character you prefer. Latex feels quite different from memory foam, and is a little closer to a regular-foam feel, just more lively and supportive.
Good to know: latex is an upgrade foam, not a Sleep Number part
Latex is not carried by Sleep Number and is not used in any Sleep Number model. It is a separate, premium foam we offer as an upgrade. If you are putting latex on top as your comfort surface, know that it will feel different from the original foam your bed came with — buoyant and responsive rather than the standard poly-foam feel. If you want to match the original Sleep Number feel instead, choose our medium regular foam.
A great base layer under gel memory foam
Latex also makes an excellent supportive base beneath a memory-foam top. Pair a 2" gel memory foam top layer with a latex layer underneath (both cut for the FlexTop King) and you get the cool, contouring surface of gel sitting on a buoyant, durable, responsive foundation — a higher-quality, longer-lasting base than standard poly foam.
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 latex feel (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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Material: 100% natural Dunlop latex
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Feel: medium, buoyant and responsive (29 ILD)
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Breathable, hypoallergenic and anti-microbial
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Thickness options: 1", 2", or 3"
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Durability: higher-quality than standard poly foam, with a longer expected life; 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 |
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 (this page) |
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
Is latex a Sleep Number foam?
No. Latex is not carried by Sleep Number and is not used in any Sleep Number model. We offer it as a separate, premium upgrade foam. If you want to match the original Sleep Number feel, our medium regular foam is the closest match.
How does latex compare to memory foam and regular foam?
Latex is buoyant and responsive — you rest on top of it and it springs back as you move, which makes turning over easier. Memory foam, like our gel memory foam, cradles you and lets you sink in. Latex feels closer to a regular foam than to memory foam, just livelier. At 29 ILD it is a medium firmness, very close to our medium regular foam.
Can I use latex as a base under gel memory foam?
Yes — it makes an excellent supportive base. A gel memory foam top over a latex base gives you a cool, contouring surface on a buoyant, durable foundation that holds up well over time.
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 latex 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 a deeper latex feel 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.
