this strengthening hair mask deeply nourishes, repairs, and thickens fragile hair. formulated with rice water to strengthen and repair, izumi tonic mask leaves hair 30x stronger* and reduces split ends by up to 91%*. it features a rich formula to deeply hydrate and thicken hair, restoring key nutrients and repairing damage from brushing. use 1-2 times per week in place of conditioner to intensely nourish and strengthen hair. inspired by a japanese haircare tradition, the izumi tonic range is formulated with rice water, known to restore damage, prevent future breakage, and reveal healthier & smoother hair. we source our rice water from hyogo, japan in an eco-friendly manner. benefits increases hair diameter leaves hair 30x stronger* thickens hair reduces split ends up to 91%* softens & smooths adds shine