Kérastase Fusio-Dose Concentré Resista is a professional concentrated treatment designed for weakened, brittle, or breakage-prone hair. Infused with Ceramides, it reinforces the hair fiber from within, restores resilience, and helps reduce breakage while improving manageability. When paired with a Fusio-Dose Booster, it delivers a personalized, in-salon quality treatment to strengthen and protect fragile hair instantly.