Kerastase Specifique Bain Prevention Shampoo is a powerful cleansing product for your hair that strengthens and fortifies strands. By using this formula infused with thickening agents, protein is easily absorbed by your cuticles. This treatment allows each hair shaft to become fuller and stronger. After rinsing, tresses are left feeling reinforced and supple. Use this shampoo in thin or fine hair to receive the best thickening effects.