A pillow that provides support of the head and neck whether you sleep on your back or side. Sensitive to pressure and weight, it adjusts to fit your body shape and aligns for optimum cervical support. The only doctor recommended pillow that uses Celliant. Determined a medical device by the FDA. Supports improved local blood flow to alleviate neck strain, headaches, morning stiffness, and discomfort from arthritic conditions. Sleeps cool...made with open cell BioMemoryFoam.