material: molded memory foam with high density ,50D to 100D washable cover with zipper. Suitable for all groups 1.material: molded memory foam from 50D to 100D2.cover:velvet,layer air material with zipper, removable, washable.3.adjust its height to fill in the space between your head and shoulder while sleeping on your side,and comfortably support your neck so that it is in line with your spine4. ...