King Split Head Flex Top Complete Set of Foam Rails | Firmer Perimeter Edge Support for Sleep Number FlexTop Beds

The complete four-rail replacement set sized for King Split Head Flex Top Sleep Number beds, where the head splits into two independent sections so each side can articulate on a FlexFit adjustable base. Comes with all four perimeter rails — both sides plus head and foot — with an optional center rail for the split-head setup. These rails are a higher density with a better seating edge than the original — 2.6 density and a firm 85 ILD. You can't go wrong with this level of quality for stronger, longer-lasting perimeter edge support. Options Heights 6" and 7". Add the center rail (Yes) for split-head support, or choose No for the standard four-rail set.