The main reason memory foam mattresses have become so popular is because of their comfort factor. It conforms to your body and reduces pressure on your spine, which means you get the best rest and sleep possible. Additionally, memory foam mattresses respond to heat and pressure to reduce pressure point problems with your back and joints. Also, with the layers of pocket coils within the mattress it encourages airflow and provides a cooler surface for sleeping helping regulate body heat. Lastly, memory foam, latex and hybrid mattresses are ideal for side sleepers because they offer pressure relief for proper alignment, whereas innerspring mattresses can't contour around pressure points.