Olaplex No. 4 Bond Maintenance Shampoo is a highly moisturizing, reparative shampoo that leaves hair easy to manage, shiny, and healthier with each use. This shampoo repairs and protects hair from everyday stresses—including damaged hair, split ends, and frizz—by re-linking broken bonds. No.4 is colour-safe and proven to reduce breakage and strengthen all types of hair.