Redken's Acidic Bonding Concentrate Leave-In is the professional all-in-one treatment for damaged, weakened, and chemically treated hair. The concentrated formula nourishes and repairs hair in a single step, strengthens weakened disulfide bonds, and provides reliable protection against color fading. Ideal for colored, bleached, or otherwise treated hair. Thanks to its built-in heat protection, your hair is also shielded from heat damage during daily blow-drying and styling. Your hair will feel strong, smooth, and nourished, just like it’s fresh from the salon. As a leave-in cream, this treatment is easy to incorporate into your daily hair care routine: Simply work a small amount evenly into your washed and towel-dried hair, massage in gently, and then style as desired—no rinsing required. For optimal results, combine the leave-in treatment with Redken’s Acidic Bonding Concentrate Shampoo and Conditioner beforehand, for all-around nourished and long-lasting strength.