Redken Acidic Bonding Concentrate 5 Min Liquid Mask is a rinse-out hair mask for damaged hair and dry hair. In just five minutes, this lightweight formula melts into hair to condition and repair hair damage inside the hair. Conditioning and repairing hair mask for hair seeking moisture and strength. This hair mask is formulated with Redkens unique 16% conditioning care complex and citric acid. Benefits of this rinse-out hair treatment include shine for 3 days**, 3x stronger, inside and out**, 72 hours of ultra-hydration***. Deep hydration. Deep Bond Repair* Intense Moisture & Strength in one use. For best results, use as a complete regimen with acidic bonding concentrate shampoo. After shampooing with the acidic bonding concentrate shampoo, apply to wet hair from mid-lengths to ends. Leave-on for 5-minutes. Rinse out thoroughly. Use at least once per week, or as often as needed. In case of contact with eyes, rinse immediately. Pro-tip: as desired, follow with acidic bonding concentrate leave-in treatment for added heat protection, shine, fly-away control & more. Acidic Bonding Concentrate is Redkens bonding haircare collection for damaged hair that hydrates and moisturizes highly damaged or processed hair, helps preserve hair health from salon services, and offers color safe conditioning. *with continued use**acidic bonding concentrate 5-min liquid mask vs. non-conditioning shampoo***based on consumer test results.