Auto-adjust Back Brace is designed to provide optimum support and stability to the lumbar spine. Two stern and rigid lumbar panels encompass along the five lumbar vertebrae (L1-L5) and stabilize their lateral aspects to prevent excessive lateral flexion and rotation. The innovative dual pulley system, ergonomically designed, allows separate adjustment in order to improve insufficient coverage of the support. As adjustment is made to fit along the lumbar curvature, comfort is enhanced and lumbar stability is strengthened.