Fanola Botugen Filler Spray is a professional program to re-construct brittle and damaged hair. This specially designed range targets the hair’s cortex and reconstructs damaged hair from the inside, strengthening the cuticle and making it compact and elastic, plumping up brittle and damaged hair. Botugen Filler Spray gives tone, body, and volume to the hair, making it extraordinarily shiny, soft and silky. It is not sticky, does not weigh the hair down, and makes the hairstyle last longer. This is step 4 of a 4-step process.