The Nº.4 Bond Maintenance Shampoo, infused with patented OLAPLEX Bond Building Technology, is a highly concentrated reparative shampoo that hydrates and nourishes hair.OLAPLEX Nº.4 Bond Maintenance Shampoo$27.97PriceQuantity*Add to CartSizeHow To UseIngredientsFeatures250 ml / 8.5 fl. oz.