When people think of “memory form” this is usually what they envision. A more classic or traditional type of memory foam is usually going to be less responsive (takes several seconds to adapt to your changes in movement) and offer a deeper and more pronounced hug and contour. The more traditional memory foam also usually has a high density.
Density on foam is measured in pounds per cubic foot (PCF). It is a measure of the foams weight. Foams with higher density usually will yield a longer life. Most traditional memory foams will use a density of 4.0-7.0 PCF.