Redken Extreme Strength Builder (250ml) is a restorative mask designed to provide a deep conditioning treatment for distressed hair, with active ingredients that work to nourish and strengthen hair fibre from within. The exclusive Interlock protein network works to strengthen the core of the hair\'s fibres, rebuild and protect the surface of the hair, and continue to provide progressive conditioning over time. The ultra-rich conditioning formula is fortified with 18-MEA amino acid and protein complex that aids in restoring the protective lipid layer, as well as penetrating the cuticle to provide targeted structural restoration. Together, Redken\'s Extreme Strength Builder\'s Interlock Protein Network and 18MEA fortifying complex deliver fantastic results, leaving hair strong, soft and shining with health.