Redken Acidic Perfecting Concentrate Leave-in Treatment provides heat protection up to 230 degrees, smoothes, tames frizz, adds shine & intensely conditions to help to reduce hair breakage. This p H-balancing leave-in Treatment is specifically formulated with an acidic p H to help to defend against the potential negative effects that can be caused by hair colouring, lightening & heat styling. The result? Hair that looks & feels healthy! To use: Use as a complete system with Acidic Bonding Concentrate Shampoo & Conditioner. Apply to clean, damp hair. Leave in. Do not rinse. Style as usual. Avoid contact with eyes.