This ultimate brow pen delivers 24-hour waterproof, smudge-proof, fade-proof and sweat-proof wear. A fine precision brush tip offers superior control and effortlessly creates individual hair strokes for a natural, full, and defined brow. Glides on smoothly and applies evenly. In a range of shades. IN A CONSUMER PANEL STUDY:100 percent said this product doesn’t smudge or run.97 percent said this product stays put all day.97 percent said this product is easy to use.94 percent said brush tip allows for precise application, accuracy, and superior control.91 percent said this product helps make brows appear fuller, more lush.- Based on a study of 33 subjects.