Shu Uemure hair styling products. SHUSU SLEEK Masque. The Shusu Sleek collection for rebellious and frizz-prone hair contains black cumin oil that nourishes and disciplines the capillary fiber and keeps the volume under control. The hair mask deeply nourishes and moisturizes to help maintaining the hair smooth for a long time. Apply from means to ends on wet clean hair, leave in for a few minutes and rinse well. Use once every seven to ten days. Your hair will be smooth, nourished and shiny.