Dry hair can cause frizz, static and flyaways. Inspired by the aloe plant that never seems to dry, Biolage HYDRASOURCE moisturizing Daily Leave-In Tonic for dry hair helps optimize moisture balance for healthy looking hair. Give her up to 15X more moisturized hair after one application.* *When using the system of HYDRASOURCE Shampoo, Conditioner and Leave-In Tonic vs. a non-conditioning shampoo. - Moisturizing hair treatment instantly renews shine - Helps protect hair from environmental aggressors - Leave-in formula is also suitable for color-treated hair. Mist lightly on damp hair and comb through from root to tips. Do not rinse. We recommend that you pair HYDRASOURCE Daily Leave-In Tonic with HYDRASOURCE Shampoo and Conditioner for extra moisture and hydration. Recommended for fine to medium hair.