The Goldwell Dualsenses Just Smooth 6 Effects Serum is a leave-in treatment designed to tame unruly and frizzy hair. It combines the microPROtec complex with kukui nut oil to deliver six instant benefits. Anti-frizz: controls flyaways. Humidity control: protects hair fiber in humid conditions. Taming and manageability: eases styling and daily maintenance. Smoothing: softens and smooths hair structure. Natural shine: brightens hair without weighing it down. HOW TO USE Apply 1 to 2 pumps on damp or dry hair, focusing on lengths and ends. Do not rinse.