Schwarzkopf Professional BC Bonacure Fibreforce, 150 ml, Hair Creams and Gels for Women, The Schwarzkopf Professional BC Bonacure Fibreforce leave-in treatment gives your hair everything it needs after washing. Characteristics: increases the thickness and strength of hair improves the quality of the structure of your hair has regenerative effects makes hair velvety smooth How to use: Apply to towel-dried hair. Do not rinse. Comb.