Eye Brows Big Boost Fiber Gel is a colored eyebrow mascara that effortlessly makes eyebrows look denser and more defined. It makes eyebrows look thicker, more defined and shaped. Long and short fibers help create a volume effect by adding density to eyebrows. The tip of the eyebrow brush fills in areas where eyebrows are sparse. shapes the side parts. Water-resistant formula gives the eyebrows a pleasant color and full look that lasts 24 hours. Also - the formula is 24 hours resistant to color fading - does not smudge or clump.