IMPORTANT TIPS ? It is important to note that changing your neck position/posture can cause temporary discomfort. Your muscles, joints, and ligaments may need time to adjust and relax into the new posture. If this is the cause of your discomfort, limit usage to 15 minutes and increase usage time over the course of a few days or a week. Go slow and listen to what your body needs. Some users require few weeks it get used to and feel the benefits. Package include : 1pc headrest pillow