Pro Longer is the first professional care product that plumps the hair ends down to the last centimeters, thanks to the patented formula Filler A-100 and amino acids it contains. Strengthened with FILLER A-100, a patented technology, and Amino Acid, Serie Expert Pro Longer Hair Length Appearance Renewing Mask is an excellent care for long hair with thinning ends. The hair fiber is instantly renewed and the hair looks stronger and brighter. Benefits: Hair ends become fuller. Provides up to 32% reduction in bifurcations. Application Apply evenly to shampooed and towel-dried hair, leave for 3 to 5 minutes. Rinse thoroughly.