ro Longer Conditioner for long hair helps to make your long hair appear thicker and visibly healthier and stronger looking.​ When used with the Pro Longer Shampoo for long hair, there is a reduction in hair breakage.​​ The Filler A-100 technology used is patented to L'Oréal Professionnel, and it works by penetrating the fibre core to plump and thicken the hair from the inside. The formula works on thin ends, or areas where help is most needed.​ To use: Apply evenly on shampooed and towel-dried hair. Comb through. Rinse thoroughly.