Professional treatment for longer, thicker and healthier hair. The L'Oréal Professionnel Serie Expert Pro Longer length-renewing mask with patented Filler A-100 technology and amino acids intensively strengthens and restores the hair fiber, reinforces the ends, and at the same time reduces hair breakage. Its gentle creamy texture makes detangling easier and improves manageability. When used together with the shampoo from the same Serie Expert Pro Longer range, this mask has been shown by instrumental tests to reduce visible split ends by up to 32%.