I toss and turn and wake up in massive pain because of injuries to my neck and muscle tightness in my upper back and neck.  Now I can sleep!!!  I flip the pillow around and try different neck heights to comfortably cradle my head for sleeping on my back. When I want to lay on my side, the edges of the pillow provide a different height that works perfect.  I tried the medium pillow and it was too high.  The petite works perfect for me as a woman.  This is my second time buying it, the first one lasted 5 years for my use.