An innovative dual-ended brow perfector with a grooming brush on one end and a triangular tip on the other that allows for a tailor-made stroke and effortless application. How To Use: Use the spoolie end of the Waterproof Brow Definer to brush the eyebrow downwards. Identify your Start, Arch and End points. With the color end of the Waterproof Brow Definer lightly fill in the hairline with delicate short strokes, following the start, arch and end points of the brow.