Certain sizes require 2 box springs. Cal King, Split Cal King, King and Split King mattresses require 2 box springs. You must order 2 box springs for these mattresses. It’s still important to support your Sealy mattress with a foundation to help prevent bowing or sagging. The Sealy StableSupport Box Spring (foundation) maximizes the comfort and durability of Sealy mattresses. NOTE: Mattress(es) sold separately.
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