When you sit in your chair with a lumbar cushion, your spine is in a neutral position with a slight forward curvature. Simply slide it onto your chair to provide lumbar support for your lower back. Your shoulders are in perfect alignment with your pelvis and ears. The lumbar support assists you in sitting in proper posture rather than falling into an unsafe posture as you place your back all the way to the chair. It provides support to your neck and provides additional support to your cervical spine by forming a mold.