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 color protection. Features amp Benefits Complete professional thickening treatment for colored hair with progressed thinning For denser-looking hair and restored moisture balance Helps remove sebum, fatty acids and other environmental residue Helps provide hair resilience and control moisture balance Provides a refreshed scalp environment 1 - Cleanser Shampoo 10.1 oz 1 - Scalp Revitalizer Conditioner 10.1 oz 1 - Scalp amp Hair Treatment 3.4 oz