This conditioner for long hair helps to make your long hair thicker & visibly healthier & stronger looking. When used with the Pro Longer shampoo for long hair, there is up to 95% hair breakage reduction & split ends are reduced visibly by up to 17%. The Filler A-100 technology used is patented to L' OrÉal Professionnel, & it works by penetrating the fibre core to plump & thicken the hair from the inside. Amino acids in the formula work to strengthen the hair from the outside. The formula works on thin ends, or areas where help is most needed.