The High Profile 9-inch Sealy Foundation base helps extend durability of your mattress Ensures the most efficient feel from your Sealy mattress in order that you get an ideal night sleep each and every night The stable foundation is built with beams and supports to create a base that prevents your mattress from sagging Foundation helps absorb your weight and motion so you’ll be able to sleep uninterrupted Strengthen your mattress with the Sealy High Profile Foundation. The 9-Inch High Profile Foundation is covered with a soft fabric. Designed with exceptional engineering, the Sealy High Profile Foundation creates a durable base for the mattress, in coordinating fabric. You will need to to Strengthen your mattress and our foundation will prevent bowing or sagging of the mattress. Any other benefit to our foundation is it’ll maximize the comfort and durability of the mattress, leaving you with your mattress for longer. The Split California King measures 84″ L x 72″ W x 9″ H.Want to purchase 2 bases to create Split California King.