The Redken Acidic Bonding Concentrate 300mL Duo is a powerful hair repair system designed to strengthen and restore damaged hair. Infused with Citric Acid, the shampoo reinforces weakened bonds from within, improving hair strength and resilience. Paired with the ultra-rich conditioner, this duo delivers intense conditioning, protects against color fade, and defends hair from the effects of heat styling and environmental stressors.