i-Glo is glow-in-the-dark eye black for athletes. The product starts out black during the day, but as the sun goes down and it gets darker outside the product starts to glow. Although the fields lights are on the product still changes color and slightly glows, but once the lights fully go out i-Glo really glows. If you wanna be a pro, you gotta glow. The target audience is ages 8 and up. i-Glo is recommended for athletes that play softball, baseball, and football, but all sports are welcome to using it.