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"A king-size set comes standard with split foundations. Sometimes people need split foundations for a queen-size in order to move it into older homes or up narrow stairways. Split (or two-piece) foundations offer the same support as a one-piece box spring. While a bed frame with head to toe center support (not side to side) is recommended on all queen size mattresses, it is required when using split box springs.\nInnerspring, latex or memory foam mattresses are not as rigid as foundations, and therefore have some flexibility to them.\nMake sure you are careful with innerspring mattresses; you do not want to bend the border rod that surrounds the innerspring. If the border rod is bent, the mattress will not lie flat."
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