Patented D-shaped center gently supports the head while lobe supports the neck, helping restore the natural curvature of the neck and upper spine. Helps relieve tension headaches, neck spasms, arthritis and snoring. Exceptional support for side and back sleepers. Shaped center gently cradles the head while sleeping on your back. Cover is 50% polyester and 50% cotton, filling is 100% virgin polyester. Fits standard pillow cases.