Olaplex No.4 Fine Maintenance Shampoo is a gentle, reparative shampoo specifically formulated for fine or thinner hair that needs cleansing, hydration, and bond repair without weighing it down. Powered by Olaplex’s patented bond-building technology, it works to repair damaged strands, strengthen hair from within, and enhance natural shine and manageability. Lightweight yet nourishing, it leaves fine hair feeling soft, refreshed, and healthy-looking. The shampoo helps maintain hair’s strength and elasticity while smoothing frizz and protecting against everyday stressors like heat styling, chemical treatments, and environmental damage. Ideal for fine hair seeking hydration, resilience, and improved texture, it ensures hair stays clean, soft, and full of natural movement.