Shu Uemura Shusu Sleek, 200 ml, Hair Masks for Women, The Shu Uemura Shusu Sleek 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: moisturises intensely regenerates the hair along its entire length protects against harmful environmental effects How to use: Wash with shampoo, then apply to damp hair.