The MAC Cosmetics Eye Brows Big Boost Fibre Gel is designed to instantly thicken, add volume, and sculpt the appearance of your eyebrows. Its fibre-infused formula helps build fullness while setting hairs in place for a look that lasts. This gel offers a convenient way to achieve fuller, more defined brows with natural-looking texture and significant holding power throughout the day. Ideal for quick touch-ups or as a finishing step in a complete makeup routine.