It's called eyebrow gel, and Make Up For Ever's Aqua Brow ($20) is outright amazing (although most brow-toned, cream-to-matte eye colors should do the trick). What makes this particular type of product so great is its high pigmentation level and stay-put finish. And because this gel dries to a semipowdery consistency, you'll get natural-looking definition that both fills and lengthens. To apply, use an angled brow brush to sculpt your eyebrows freehand and run a spooly brush over the gel to break up the product and set it. But if you prefer to work with a bit more structure, employ the magic of an eyebrow stencil for an even more precise result.
The bold brow trend was seen at the following Fall 2012 runway shows: J. Mendel (upper left), Marc by Marc Jacobs (upper middle), Burberry Prorsum (upper right), Alexander Wang (center left), Proenza Schouler (center middle), Derek Lam (center right), Givenchy (lower left), Fendi (lower middle), and Max Mara (lower right).