展开Define your brow, fill-in, shape and blend with Yves Saint Laurent’s Couture Brow Slim. This ultra-slim waterproof brow pencil is designed for all day wear. The twist up pencil fills and sculpts brows with ultimate precision and the nib creates hair-like strokes for a natural look. Sculpt the brows and fill any sparse areas using small precise strokes, before blending the colour and structuring the brow line with the brush to create a defined look.