K18 Biometric Hairscience Leave In Molecular Repair Hair Mask is a protein rich repairing mask. Created to be used by those who have experienced hair damage sue to color application, bleaching, chemical processing, and heat styling. Helps to rebuild your hairs natural strength, smoothness, shine, and elasticity. Created with a patented K18 Peptide that helps to absorb directly into your hairs broken keratin bonds and rebuild them. This is a leave in treatment. How to use: Start by shampooing hair. Rinse well and towel dry. DO NOT APPLY CONDITIONER after you use the shampoo. After you towel dry hair, apply K18 Mask from roots to ends. Comb through using a wide toothed comb. Leave on your hair for 4 Minutes. This is the time it tales the mask to absorb and work on repairing your hair. After 4 minutes, style hair as usual. DO NOT RINSE. Created with K18 peptides, Hydrolyzed Wheat proteins, Hydrolyzed, Wheat Starch, and Citric Acid.