Restore your hair's strength and shine with the Olaplex No. 4 & No. 5 Duo. This powerful pairing works together to cleanse and condition while repairing broken bonds within each strand. The sulfate-free shampoo gently removes impurities without stripping, while the nourishing conditioner seals in moisture and smoothness. Perfect for color-treated, damaged, or chemically processed hair, this duo helps restore elasticity and reduce breakage. Experience visibly healthier, more resilient hair with every wash. Includes 3.3 fl.oz of each product—your complete bond-building routine in one set.