Goldwell Dualsenses Just Smooth, 500 ml, Hair Masks for Women, The Goldwell Dualsenses Just Smooth hair mask is an essential step in your hair care ritual. Give it a moment to regenerate and it will repay you with vitality and beauty. Characteristics: strengthens the hair fibre restores hair structure restores hair’s natural, healthy appearance How to use: Wash with shampoo, then apply to damp hair.