Wenger Nota conBRIO Premier Music Posture Chair Dynamic frame allows more freedom of movement Patented design provides two seating zones: "engaged" (rear) and "perched" (forward). Each zone enhances performance by promoting a naturally balanced skeletal shape, reducing muscle strain and enabling increased circulation, freedom of movement, and diaphragmatic breathing Narrow convex back provides lumbar support while still allowing for freedom and range of movement Rounded waterfall front allows one height of chair to accommodate a wider range of body sizes 19" seat-to-floor frame height