Nioxin 3-part System Loyalty Kit 4 for coloured Hair with Progressed Thinning: System 4 helps you achieve thicker, fuller-looking hair and restore moisture balance. System 4 delivers thicker, fuller hair by removing follicle-clogging sebum, fatty acids and environmental residues, while providing moisture balance and colour protection.Helps you achieve noticeably smoother and denser-looking hair.Delivers thicker, fuller hair with smooth control by removing follicle-clogging sebum.Restoring the moisture level and providing colour protection.