Olaplex No.4FINE Bond Maintenance Shampoo is a lightweight, volumizing shampoo crafted for fine to medium hair types in need of gentle repair. Infused with patented OLAPLEX Bond Building Technology™, it helps strengthen and rebuild broken bonds while delivering soft hydration and body without heaviness. This sulfate-free, color-safe formula boosts shine, improves manageability, and leaves hair feeling clean, airy, and noticeably healthier after every wash.