MAC Eye Brows Big Boost Fibre Gel has a gel formula with microfibers that gives brows a voluminous boost in a single swoop with 24-hour wear. Benefits Long-wearing, 24 hours Volumizing and buildable Tri-Fibre Technology Sweat-proof and waterproof Smudge-proof and fade-proof Non-flaking Features 95% of users reported instantly fuller-looking brows 96% of users reported instantly transformed brows 91% of users reported effortless application