The memory foam mattress remembers body positions and adjusts itself to the body. The polyurethane-based mattress has density that creates its ability to bounce back in a significant form. It is a responsive mattress and it reacts quickly to body forms, interpreting the heat that the body emits and forming a partial depression where it makes contact with the body.
When the pressure provided by the body is removed, the memory foam mattress remembers its previous state and returns to the previous form. This happens effortlessly and repeatedly. There is no permanent depression or sagging with this mattress. It has a fast system for recovery and jumps right back into its original form.