The patch is a thin, beige piece of plastic that looks like a square Band-Aid. It's a little less than two inches across, and comes in one—and only one—color. (Beige.) You stick the patch on your skin and it gives off hormones that prevent your ovaries from releasing eggs. The hormones also thicken your cervical mucus, which helps to block sperm from getting to the egg in the first place. Ortho Evra is the medical name, but most people just call it the patch.