All-in-one builder

Rebuilding your bed from top to bottom?

Choose your comfort foam (stack layers or pick a different foam for each side), foam rails and a new cover in one spot, and see your total as you go.

Start your rebuild →
15 products
Sale
Pair of replacement foam side rails for Sleep Number beds from Magic Sleeper, higher-density firmer edge support
Replacement foam side rails for a Sleep Number bed, shown as a matched pair for both sides of the mattress
Foam Side Rails Sale price $16900 Regular price $22500 Save 25%
Sale
Complete set of four replacement foam rails for Sleep Number beds — both sides plus head and foot
Corner view of the complete foam rail set showing the firmer perimeter edge support for Sleep Number beds
Complete Set of Foam Rails - Center Rail Option - Firmer Perimeter Edge Support from $26900 Regular price $35800 Save 25%
Sale
Close-up of a replacement medium regular foam corner showing the open-cell structure
Hand pressing into replacement medium regular foam to show its cushioning feel
Replacement Medium Regular Foam (Most Comparable Feel To Sleep Number's Regular Foam) from $13900 Regular price $18500 Save 25%
Sale
Corner of replacement gel memory foam for Sleep Number beds, cooler-sleeping 4 lb density with open-cell texture
Sleep Number replacement gel memory foam, a breathable medium-firm comfort layer
Replacement Gel Memory Foam from $19900 Regular price $26500 Save 25%
Sale
Corner detail of the natural Dunlop latex replacement foam showing the molded pinhole aeration and open-cell texture
Hand pressing into the medium natural latex replacement foam to show its soft, springy feel
Replacement Medium Latex Foam from $13800 Regular price $18400 Save 25%
Sale
Detail of convoluted egg crate foam peaks for a Sleep Number comfort layer
Top-down view of blue egg crate foam replacement topper for Sleep Number beds
Egg Crate Convoluted Foam from $17900 Regular price $23900 Save 25%
Sale
Close-up of a replacement firm regular foam corner showing the open-cell structure
Hand pressing into replacement firm regular foam to show its supportive, firm feel
Replacement Firm Regular Foam (Firmer Feel Than Sleep Number's Regular Foam) from $13900 Regular price $18500 Save 25%
Sale
Close-up of a replacement soft regular foam corner showing the open-cell structure
Hand pressing into replacement soft regular foam to show its plush, cushioning feel
Replacement Soft Regular Foam (Softer Feel Than Sleep Number's Regular Foam) from $13900 Regular price $18500 Save 25%
Sale
Corner of Split Head Flex Top replacement gel memory foam for Sleep Number FlexTop Queen, King and Cal King beds, cooler-sleeping 4 lb open-cell foam
Split Head Flex Top replacement gel memory foam comfort layer for Sleep Number FlexTop beds, breathable medium-firm foam
Split Head Flex Top Replacement Gel Memory Foam | Queen / King / Cal King | 4 lb Cooler-Sleeping Comfort Layer for Sleep Number FlexTop Beds from $34400 Regular price $45900 Save 25%
Sale
Corner of Split Head Flex Top replacement medium regular foam for Sleep Number FlexTop Queen, King and Cal King beds, open-cell structure
Hand pressing into Split Head Flex Top replacement medium regular foam for Sleep Number FlexTop beds to show its medium-firm cushioning feel
Split Head Flex Top Replacement Medium Regular Foam | Queen / King / Cal King | Sleep Number Comparable Comfort Layer for FlexTop Beds from $19400 Regular price $25900 Save 25%
Sale
Complete set of Split Head Flex Top replacement foam rails for Sleep Number FlexTop Queen, King and Cal King beds — both sides plus head and foot
Corner view of the Split Head Flex Top complete foam rail set showing the firmer perimeter edge support
Split Head Flex Top Complete Set of Foam Rails | Queen / King / Cal King | Firmer Perimeter Edge Support for Sleep Number FlexTop Beds from $28900 Regular price $38600 Save 25%
Sale
Corner detail of Split Head Flex Top natural Dunlop latex replacement foam for Sleep Number FlexTop Queen, King and Cal King beds, showing molded pinhole aeration
Hand pressing into Split Head Flex Top natural latex replacement foam for Sleep Number FlexTop beds to show its soft, springy feel
Split Head Flex Top Replacement Natural Latex Foam | Queen / King / Cal King | Medium 29 ILD Comfort Layer for Sleep Number FlexTop Beds from $25400 Regular price $33900 Save 25%
Sale
Detail of convoluted egg crate foam peaks for a Sleep Number FlexTop comfort layer
Close-up of blue convoluted egg crate foam surface texture and airflow channels
Split Head Flex Top Egg Crate Convoluted Foam Topper | Queen / King / Cal King | Sleep Number FlexTop Beds from $22400 Regular price $29900 Save 25%
Sale
Corner of Split Head Flex Top replacement firm regular foam for Sleep Number FlexTop Queen, King and Cal King beds, open-cell structure
Hand pressing into Split Head Flex Top replacement firm regular foam for Sleep Number FlexTop beds to show its supportive, firm feel
Split Head Flex Top Replacement Firm Regular Foam | Queen / King / Cal King | Firmer-Feel Comfort Layer for Sleep Number FlexTop Beds from $19400 Regular price $25900 Save 25%
Sale
Corner of Split Head Flex Top replacement soft regular foam for Sleep Number FlexTop Queen, King and Cal King beds, open-cell structure
Hand pressing into Split Head Flex Top replacement soft regular foam for Sleep Number FlexTop beds to show its plush, cushioning feel
Split Head Flex Top Replacement Soft Regular Foam | Queen / King / Cal King | Softer-Feel Comfort Layer for Sleep Number FlexTop Beds from $19400 Regular price $25900 Save 25%

Sleep Number® Replacement Foam and Foam Rails

Inside every Sleep Number® bed there are two kinds of foam. The comfort foam lays across the top of the air chambers and rails and is what you feel when you lie down. The foam rails form a firm border around the air chambers that holds them in place and keeps you from rolling off the edge. Over time both break down, which causes dips, a soft middle and sagging edges. Replacing them costs a fraction of a new bed, and every piece is made to order in the USA and shipped free.

Choose your comfort foam

Foam Feel Heights From
Medium Regular Closest to the original Sleep Number® feel 1″–4″ $139
Firm Regular Firmer than original, more support 1″–4″ $139
Soft Regular Softer than original, more cushion 1″–4″ $139
Gel Memory Foam Contours to your body and sleeps cooler 2″–4″ $199
Latex Medium (29 ILD), buoyant and responsive, very durable 1″–3″ $138
Egg Crate (convoluted) Soft, airy topper layer 1.5″ or 2.5″ $179

Choose your foam rails

Foam side rails

The left and right rails only, for beds where the long edges sag. 6″ or 7″. From $169.

Complete set of rails

Sides, head and foot, with an optional center rail between the air chambers. 2.6 lb density, 85 ILD foam for firm edges. 6″ or 7″. From $269.

FlexTop rail set

For FlexTop (split-head) Queen, King and Cal King beds: sides, foot and a split head rail so each side can raise. 6″ or 7″. From $289.

Measure the height of your current rails before ordering. Most Sleep Number® beds use 6″ or 7″ rails.

Which part fixes my problem?

What you notice What usually fixes it
A dip or body impression where you sleep New comfort foam
You roll toward the edge or the sides sag New side rails or a complete set
The bed feels too firm or too soft overall A different comfort foam, or a second layer
One sleeper wants it firmer than the other Two split-size foam pieces, one per side

Have a FlexTop (split-head) bed? Use our FlexTop parts, which are cut for the split at the head.

Sleep Number® foam FAQs

Which foam feels most like my original Sleep Number® foam?
Medium Regular Foam is the closest to the feel most Sleep Number beds had when they were new, and the safest pick if you are not sure. Firm and Soft Regular Foam make the bed firmer or softer than original.
What is the difference between comfort foam and foam rails?
Comfort foam is the layer that lays across the top of the air chambers and the rails and gives the bed its feel. Foam rails are the firm border that frames the air chambers, holds them in place and gives you edge support.
What height comfort foam should I order?
Measure the foam layer in your bed now. Most beds use 1″ to 4″. If you want a softer feel you can go thicker or stack a second layer, and add the extra height to your cover size if you are replacing the cover too.
Can each side of the bed have a different foam?
Yes. Order the Split Queen (30″ x 80″), Twin XL (for a King) or Split Cal King (36″ x 84″) size in two different foams, one per side, in the same height. Many couples add a full-size gel or latex layer on top. The Sleep Number bed builder does this for you.
Do I need side rails or a complete set?
If only the long sides are sagging or you roll toward the edge, side rails are enough. If the head and foot pieces are also broken down, or you want a center rail between the chambers, order the complete set.
What is the return policy on foam?
You can ship comfort foam back for a refund or exchange, or keep it and get 50% off a different foam. One comfort exchange per customer. See our foam comfort exchange policy.

More Sleep Number® repair

What Sleep Number® Owners Say About Our Replacement Foam

Rated 4.9 across 180+ Google reviews

Was able to replace the foam in a 10+ year old Sleep Number bed and make it as good as new — at a fraction of the cost.

Foam replacement10-year-old bed via Google

Ordered replacement foam for a bed no longer serviced by Sleep Number. Easy to order off the website and it came in no time. Fit perfectly. Saved big over replacing the whole mattress — couldn't be happier.

Foam replacementBed no longer serviced by Sleep Number via Google

Upgraded my old Sleep Number bed with a new cover and memory foam. Half the price of what it was from Sleep Number, and a great product.

Memory foam & coverHalf the OEM price via Google

My husband ordered the firm foam and it was too hard for me. I called and the rep explained all the foam options and helped us land on medium. Their customer service is top notch — if you are not sure which foam to buy, give them a call and let them walk you through it.

Choosing a firmnessTop-notch service via Google
Read our Google reviews Leave us a review
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