Enlighted installed blue LEDs in these vests for the Kidzbop "Make Some Noise" tour in 2015.
The girls' and boys' versions have a similar arrangement of lights, with emphasis on the front and shoulders, and a stripe around the waistband.
In 2016, some of the pieces were enhanced with additional LEDs.
The lights can be illuminated with a steady glow, or with a few different chasing patterns, controlled by a switch built into the vest.
The clip below is from a Kidzbop performance in 2015.