Matrix Biolage Delicate Care Shampoo for Color Treated Hair is a sulfate free gentle daily use shampoo that maintains your hair color full of shine. When caring for your hair or creating a daily hair care routine, it is always important to keep certain things in mind. Wash hair less often. Over washing can cause dryness, dullness, irritate scalp and breakage. Use gentle shampoos that are sulfate free or that use mild sulfates. Unless you have oily hair, which sometimes requires a deeper cleansing. Use a daily hair conditioner and weekly hair mask to treat any special area of concern with your hair such as dryness, breakage, color protection, volumizing.