Goldwell Dualsenses Bond Pro Day & Night Bond Booster is developed for weak, fragile hair that is prone to damage. It uses Inter-Amino-Bond-Builder Technology that fortifies the hair from inside out by forming new ionic and hydrogen bonds, while a MicroPROtec Complex distributes essential care ingredients quickly and evenly and protects from colour-fade-out. This leave-in treatment reduces breakage and split ends by up to 99% making it the perfect product for emergency split-end care - a definite hero product of the line!.