The main different between egg crate foam and memory foam is the shape and design. Where egg crate features a top layer with peaks that resemble an egg crate, memory foam is in a solid, flat topper. Egg crate foam is made with side and back sleepers in mind as it provides additional support on the spine, hips and shoulders when lying down. Memory foam suits all sleep styles and the smooth surface will adapt and contour around your body. It will retain its original position after sleeping.