If you have a traditional innerspring or coil mattress, flipping the mattress every month or so will increase the longevity of the mattress and prevent sagging in the middle.
New mattresses on the market today such as memory foam, latex or air mattresses are built in such a way that they do not need to be flipped.
General Guide:
Innerspring (coil) Mattress: Flip
Memory Foam Mattress: Do Not Flip
Latex Foam Mattress: Do Not Flip
Air Mattress: Do Not Flip
Waterbed Mattress: Do Not Flip
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Tags: airbed, latex, mattress, memory foam, waterbed