That depends on its construction. If your mattress is dual-sided (meaning it has a comfort layer on both sides and a coil core in the middle), you can flip it right over. However, if your mattress’s comfort layer is only on a single side, then you will not be able to turn it over. Many mattresses are constructed with a bottom and a top. The base layer will not be comfortable to sleep on because it’s either hard foam or just coils. Meanwhile, the comfort layer may be squished and ruined by prolonged pressure. Mattresses like these should never be flipped, so ensure you’re familiar with your mattress’s layers before attempting to flip it.