Goldwell Dualsenses Just Smooth 60Sec Treatment 500ml is the ideal serum to use to achieve sleek, glossy hair. This leave-in formula that works to smoothen and tame rebellious, frizzy hair. Provides your hair with frizz control and gives you colour protection to minimise fading. Contains a Kukui Nut Oil that evens the surface of hair and smoothens hair structure for sleek, tamed results.