Hair Fiber Reinforcer Result: More volume. Target Group: For those with fine hair that demands an intensive care and stability regimen. Product: The intensive weekly treatment for volume and stability that reinforces the hair structure from within. The formula with excellent care performance, strengthens the hair fibers without weighing down the hair. Application: After shampooing with a System Professional Shampoo, use 25g of the mask and apply with a brush directly on the hair, avoiding the scalp. Gently massage with one of the System Professional massage techniques and leave for 5 minutes. if used with infusions, mix and apply on the hair. Emulsify and rinse thoroughly.