Breathable Ilira®-stretch mesh back cradles your spine with natural lumbar support and increases airflow. The Synchro-tilt control mechanism with seat slider reclines the back and seat in the perfect ratio to give you a natural posture, whether sitting upright or leaning back. Height- and -width adjustable arms and an adjustable lumbar support provide a custom fit. Easy assembly. Supports up to 300 lb.Note: This is a non-returnable item.