Natural Silk Fibers: Provide comfort and a radiant look. Ultra-Mattifying Natural Linen Fibers: Refine the look of skin texture, and provide a velvety-soft feel. Stretch Fibers: Provide a smoothing and shaping effect. How to Use: Prep skin with L'Or Primer (sold separately) to smooth fine lights and provide and even texture for foundation application. Apply a few drops of the foundation to the face, then use your fingertips or the Guerlain Foundation Brush (sold separately) to blend in. Move.