Goldwell Dualsenses Just Smooth 6 Effects Serum 3.4 Ounce 100 Milliliters Goldwell Dualsenses Rich Repair 6 Effects Serum works to repair your hair inside and out. Gives shine without being oily and makes hair smooth and adds bounce. Goldwell Dualsenses Just Smooth 6 Effects Serum is ideal for unruly and frizzy hair, blended with microPROtec complex and Kukui Nut Oil.