The ContourSide Pillow is made from premium Visco-elastic memory foam. This orthopedic, pressure-relieving material is sensitive to body temperature and weight. As you rest, the memory foam will softly conform to your contours by taking an impression of your anatomy. The memory foam will automatically adjust to your body temperature and weight as your body stabilizes in its resting place. When equalization between body weight and the elasticity of the memory foam is achieved, your spinal column will be ideally aligned while in a side sleeping position.