Colored keratin protein-based hair fibers from Toppik blend seamlessly with pre-existing hair strands to create a natural, thick and full look. They also provide instant filling of thinning areas, reduces hair loss, and gives fine hair a full, full-looking texture. Toppik Hair Fibers are available in nine different shades that can be mixed to match virtually any hair color. They also work well for part lines, covering extension lines, and touching up roots between hair color appointments.