Nº.4 FINE Bond Maintenance® Shampoo is a scientifically-formulated solution for fine, damage-prone hair. It's weightless, bond repair formula strengthens strands, adds volume, and improves hydration without weighing hair down or causing excess oil. Transform your hair with this gentle, expertly-designed shampoo. OLAPLEX Bond Building Technology™ for repairing fragile bonds Hydra-Balancing Matrix for balanced sebum levels Low Molecular Weight Hyaluronic Acid for lightweight hydration and softness Who is it for? All hair types Anyone with fine hair What Does it do? Strengthens fragile hair Adds healthy body and volume Weightless hydration for fine strands Reduces excess sebum production Gently cleanses and detangles Promotes balanced hydration Suitable for damage-prone hair How-To Apply to wet hair Lather Rinse