Semi-Flex Foundation's Performance Grid is the steel wire foundation that's better than all-wood alternatives because it's stronger, lasts longer, and doesn't squeak or crack like wood does.

King Koil Intimate Catalina Standard Foundation- King

Lend your mattress a stable and sturdy base with the steel flex design of this low profile foundation by King Koil. Its reduced profile makes it ideal for those who have difficulty getting on and off a high mattress.

King Koil Natural Low Profile 5" Foundation- Twin Xl, Created for Macy's

Lend your mattress a stable and sturdy base with the steel flex design of this high profile foundation by King Koil.

King Koil Natural High Profile 9" Foundation- Twin Xl, Created for Macy's

King Koil Natural Low Profile 5" Foundation- King, Created for Macy's

King Koil Intimate Catalina Standard Foundation- Twin Xl

King Koil Natural High Profile 9" Foundation- King, Created for Macy's

King Koil's Semi-Flex performance grid steel mattress foundation is an ultra-supportive boxspring option that's stronger, lasts longer, and creates less noise than all-wood alternatives. The reinforced steel grid adds surface coverage and enhances stability.

King Koil SmartLife Semi-Flex Low Profile 5" Foundation- Queen

King Koil Natural High Profile 9" Foundation- Queen, Created for Macy's

King Koil Natural High Profile 9" Foundation- Full, Created for Macy's

King Koil Natural High Profile 9" Foundation- California King, Created for Macy's

King Koil Natural Low Profile 5" Foundation- Full, Created for Macy's

King Koil Intimate Catalina Standard Foundation- California King

King Koil Natural Low Profile 5" Foundation- California King, Created for Macy's

King Koil Natural Low Profile 5" Foundation- Queen, Created for Macy's

King Koil Intimate Catalina Standard Foundation- Queen

King Koil Intimate Catalina Standard Foundation- Twin

King Koil SmartLife Semi-Flex Standard Profile 9" Foundation- King

King Koil SmartLife Semi-Flex Standard Profile 9" Foundation- Queen

King Koil Intimate Catalina Standard Foundation- Full

King KoilSmartLife Semi-Flex Standard Profile 9" Foundation- King

Product Info

King Koil SmartLife Semi-Flex Standard Profile 9" Foundation- King