Split Head Flex Top Replacement Cover for Sleep Number FlexTop Beds
This is the smooth top stretch knit replacement cover built specifically for Split Head Flex Top Sleep Number beds — the FlexTop King and FlexTop California King configurations where the head of the mattress is split into two independent halves so each sleeper can raise or lower their side on a FlexFit adjustable base. If your current Flex Top cover is sagging, stained, torn, or has lost its stretch, this direct-fit shell restores the look and feel of the newer Sleep Number smooth knit top.
Custom-fit to your exact mattress height. Flex Top Sleep Number beds range from 8" to 15" tall depending on model and any added layers. Choose the height that matches your bed today and we build the cover to fit — no bunching, no gaps at the zipper, and a clean split down the head that matches your mattress.
What Is a Split Head Flex Top Cover?
A Split Head Flex Top cover is a one-piece replacement encasement for a King or California King Sleep Number bed whose upper third (the head end) is divided into two separate sections. This split lets each side of the bed articulate independently on an adjustable base while the foot two-thirds stays joined as a single platform. Our cover zips over the full mattress with the head split sewn in to match.
Compatible With These Flex Top Sleep Number Models
Designed to fit Sleep Number 360 Smart Bed FlexTop King and FlexTop California King models from approximately 2020 through early 2026, including:
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Classic Series: c2, c4 Smart Beds (FlexTop)
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Performance Series: p5, p6, pSE Smart Beds (FlexTop)
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Innovation Series: i8, i10, iLE Smart Beds (FlexTop)
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Memory Foam Series: m7 Smart Bed (FlexTop)
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Climate Series: ClimateCool (2024) and Climate360 (2022) FlexTop
Not sure of your configuration? If the head of your King or Cal King mattress splits into two sections that move independently, you have a Split Head Flex Top.
What Makes This Cover Different
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Sewn-in head split matching the FlexTop King / Cal King two-section design
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Stretch knit top fabric that moves with the air chambers instead of bunching
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Durable woven side panels in light gray, matching newer Sleep Number borders
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Heavy-duty single zipper with a smooth-pull tab
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Reinforced corner seams at every stress point
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Choice of air hose openings — at the head or on the sides, to match your pump routing
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Custom-sewn to your mattress height (8"–15")
Need a standard (non-split) size instead? Twin through Cal King smooth top covers are on our Smooth Top Shell page. For older quilted or Euro top beds, see the Euro Top Shell.
Air Hose Openings
Choose At the Head if your air hoses exit near the top of the mattress, or On The Sides if they run out the sides toward the pump. This keeps the hoses routed cleanly without stressing the zipper.
Available Heights
8", 9", 10", 11", 12", 13", 14", and 15" — select your size at checkout.
