This is headwear that will turn heads! What looks like a normal cool design baseball cap becomes an amazing animated display of radiant light when you turn it on. Electro-luminescent technology creates multiple pulsating patterns right on your hat! The flexible animated design is stitched onto the cap and lays completely flat (does not bulge out). The animation is powered by 2 easily replaceable AAA batteries (not included) which sit in a comfortable hidden compartment inside the cap. All electronics and chips are enclosed within the cap for a great, finished look. 100% cotton cap with velcro closure. Fits most adults.