Our flashing fiber optic baseball cap comes with a colorful Rainbow Wave design. Each cap has high powered LEDs that light up the state-of-the-art fiber optic technology built into the custom embroidered high quality cap. LEDs cycle between various patterns in each of the rainbow colors. LEDs are much brighter than captured in our image. Each 6-panel baseball cap has an adjustable velcro strap that will fit most any head. GREAT LOOKING IN EITHER DAYTIME OR NIGHT. 2 replaceable CR2032 batteries are included and installed