Great product. A must have. Everyone sits. As a senior Feldenkrais® Practitioner and Trainer, I can verify that this truly makes all the difference in the world aligning your spine and head over your sitz bones. Posture is the key in all dynamic positions; standing, sitting, etc. This fusion keeps one from slumping at the chair, which causes neck and back pain, head postured forward, migraines, eye strain, you name it. A must have for all.