Create bushy model-esque brows with the MAC Eye Brows Big Boost Fibre Gel. This gel formula is packed full of microfibres to add volume and definition to each brow hair for a naturally fuller look. The various shades are designed to provide a perfect match for any hair colour, depositing subtle pigment for a defined brow that’s perfectly undone. The volumizing brow gel works to keep your brows looking full and fluffy for up to 24 hours, thanks to its water-proof, sweat-proof formula that won't flake, smudge or fade.