Schwarzkopf Fiber Force Fortifying Shampoo. A sulfate-free shampoo that strengthens hair. Delicately cleanses and restores weak, over-processed hair. Bonacure Fibre Force introduces a new dimension of hair repair returning even most eroded hair to its optimal level of force and resilience. For the first time the formulas with Micronized Hair-Identical Keratins penetrate deeply into the hair architecture to re-cement specifically the Cell-Membrane-Complex, the intercellular bonding cement responsible for strong and resilient hair fibre. Bond Connector Technology creates bonds inside the matrix and seals the cuticle. Improves the strength of the hair fibres and protects them.