Bond-Repairing Sulfate-Free Shampoo with Olaplex Bond Building Technology Nº.4 Bond Maintenance Shampoo from Olaplex is a sulfate-free cleansing step built around Olaplex's patented bond-building ingredient, Bis-Aminopropyl Diglycol Dimaleate. The formula cleanses without SLS/SLES sulfates, parabens or phthalates, while reinforcing the internal bonds that everyday styling, heat and chemical services weaken. Panthenol (provitamin B5), Glycerin and a botanical blend of Avocado, Grape Seed, Crambe Abyssinica and Camellia Sinensis seed oils support softness and shine through the wash. The 250ml bottle is the standard at-home format of the Nº.4 system. Why Choose It? Reinforces bonds inside the hair shaft with Olaplex's patented Bis-Aminopropyl Diglycol Dimaleate Sulfate-free cleansing — free of SLS and SLES, parabens, phthalates and MIC/MIT Clinically proven to boost shine and reduce split ends and frizz Replenishes hydration via Panthenol, Glycerin and a multi-oil botanical layer without weighing hair down Highly concentrated — a small dose lathers thoroughly in a single wash Best For Hair weakened by heat styling, colour, lightening or chemical services that needs sulfate-free maintenance cleansing between bond-repair treatments. The 250ml bottle is the standard daily-use format of the Nº.4 Bond Maintenance system.