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.