The formula, enriched with Pro-Keratin and Kukui and Evening Primrose Oils provides 4 days of smoothing and frizz free hair even at 80% humidity*. Also contains Xylose, well known to protect the fibre from the heat of blow-dryer / flat iron. How to use Apply to shampooed and towel-dried hair. Leave on for 3-5 minutes. Rinse. In case of contact with eyes, rinse them immediately.