The Healthy Wave Mat Amethyst Jade Tourmaline Far Infrared PEMF and Photon Pillow is specifically designed with embedded memory foam to fit the curvature of your neck when lying down. This pillow also features PEMF technology with selections of frequency range 1 to 30 Hz , plus 660nm therapy red lights matrix panel to focus on the base of the neck. It features over 2 lbs of crushed amethyst, 0.25 lbs of crushed Jade, 0.5 lbs of Tourmaline and Obsidian that cover the curvature of the pillow. This far infrared neck pillow is excellent if you want to target tight neck muscles. It’s quite comfortable to use on its own or with a pillow behind it to support your head. It works great on its own but is an excellent addition to be used when lying down on any other Healthy Wave Mat.