Overo coat patterns occur on any color background and the white areas on overos are usually crisply and cleanly delineated from the colored areas, although some have a halo or shadow of pigmented skin under white hair directly at the boundary. White spotting of the overo horse usually comes up from the belly in a horizontal arrangement and does not cross the topline. The overo horse may have solid-colored legs with normal white markings and the tail is one color. It may be bald-faced, covering both eyes, or apron-faced with white markings extending beyond the ears and under the chin. The eyes of an overo with extensively white facial markings are frequently blue.