What it is: A highly moisturizing, reparative shampoo that leaves hair easy to manage, shiny, and healthier with each use. Highlighted Ingredients: - Bis-Aminopropyl Diglycol Dimaleate: Patented bond-building technology that rebuilds broken and weakened bonds. Key benefits: - Repairs and maintains bonds within the hair - Eliminates frizz and flyaways - Reduces breakage If you want to know more… This shampoo repairs and protects hair from everyday stresses—including damaged hair, split ends, and frizz—by re-linking broken bonds. No.4 is color-safe and proven to reduce breakage and strengthen all types of hair.