Strengthens and protects fine hair Removes buildup to help volumise and lift at the roots Clinically proven to repair and prevent future damage Clinically proven to strengthen hair OLAPLEX No. 4  Fine Hair Bond Maintenance Shampoo An ultra-light, clinically proven fine hair shampoo to volumise and strengthen. This lightweight volumizing shampoo designed for fine hair is clinically shown to strengthen, repair, and protect against future damage caused by daily factors, styling, or salon treatments. The ideal shampoo for fine hair should both volumize and repair. Nº. 4FINE delicately eliminates buildup, ensuring hair feels clean and soft while providing enduring volume, body, and bouncewithout feeling heavy or dry.Key Benefits: Gently cleanses without stripping Strengthens and protects fine hair Removes buildup to help volumise and lift at the roots Clinically proven to repair and prevent future damage Clinically proven to strengthen hair How to use: Apply to wet hair.