Scalp & Hair Leave-In Treatment System 3 (Color Treated Hair/Normal to Light Thinning) - Nioxin Scalp & Hair Leave-In Treatment System 3 (Color Treated Hair/Normal to Light Thinning) is a professional volumizing scalp and hair leave-in treatment for colored hair with light thinning. Benefits Professional volumizing scalp and hair leave-in treatment for colored/chemically treated hair with light thinning. Transactive Delivery System 2.0 technology provides thicker-looking hair by increasing the fullness of each hair strand. Moisturizes hair and scalp for thicker, fuller hair. Increases hair resilience plus moisture balance. Shake well. Apply evenly to entire scalp. Do not rinse. Nioxin's diameter-increasing Scalp Treatment is the final step of the three part System, which amplifies hair texture while protecting against breakage. - Scalp & Hair Leave-In Treatment System 3 (Color Treated Hair/Normal to Light Thinning)