Redken Acidic Perfecting Concentrate Leave-In Treatment is Redken's most concentrated all-in-one formula for the ultimate repair and care of damaged hair. The super nourishing leave-in provides ultimate repair, intensive care and protection against color loss. The leave-in treatment contains a concentrated bonding care complex and citric acid. This strengthens weakened sulfite bonds in the hair and minimizes hair breakage. In addition, the Leave-In treatment repairs hair, provides heat protection up to 230 C°, tames frizz and adds maximum shine. This pH-balancing leave-in is specially formulated with an acidic pH to prevent the negative effects of hair dyes, styling tools and even water. The result? Hair that looks and feels healthy! Application: Use as a complete conditioning system with Acidic Bonding Concentrate Shampoo and Conditioner. Apply to clean, damp hair. Leave on. Do not rinse. Style as usual. In case of eye contact, rinse immediately.