Truss Professional Brush Thermo-Activated Keratin Treatment is recommended for porous and chemically treated hair. Brush is a weekly thermal leave-in treatment extremely rich in Proteins, Collagen and Lipids for intensive reconstruction. This product restores the Keratin lost during chemical processes, providing strength and resistance from mid-shaft to the ends of the hair. This product requires heat in order to be activated. Do not allow to air dry.