Redken's Acidic Bonding Concentrate is a leave-in treatment that provides ultimate strength, repair, intense conditioning and hair colour fade protection. Featuring Citric Acid, this leave-in treatment contains a concentrated bonding care complex that reinforces weakened bonds within the hair to improve hair strength. It provides heat protection up to 450 degrees, tames frizz, adds shine and reduces hair breakage. This pH-balancing leave-in conditioner is specifically formulated with an acidic pH to defend against the negative effect of hair colouring, styling tools, and even water. The result? Hair that looks and feels healthy.