Makeup artists love using brushes to apply foundation because it's fast and they can lay it down exactly where they want it. You can use a brush to apply foundation all over the face or in just one area. Bristles are synthetic so that they don't absorb the makeup, which makes it easy to apply evenly. They are also easier to clean than natural-bristle brushes. To use: Apply a small amount to the brush and brush a thin coat on the skin as needed. Make sure not to apply too much foundation to the brush, or you could be left with a very masklike appearance.