System 5 is designed to remove sebum, fatty acids and environmental deposits, while supporting the resistance of the hair. It restores the moisture balance of the hair and provides color protection.professional care treatment for thickening chemically treated, subtly thinning hair.for fuller looking hair and intense moisturefrees scalp and hair from sebum, fatty acids and environmental depositsincreases the diameter of each hair and provides smoothnessApplication: Apply the conditioner to the scalp and hair. Leave on for 1 to 3 minutes. Rinse.