Retroreflective film lines the torso and cross-section of the vest providing passive visibility from external light sources. It also provides a refraction layer for the embedded LEDs.
Front/back custom color LEDs line the retroreflective film. The vest provides steady or flashing RGB LEDs to produce active visibility when visibility is low. These LEDs are controlled from a small switch connected to a 9V battery pack.
The one-size-fits-all Prism uses an elastic belt with a sturdy clip on each side. There is a front pocket with velcro to hold personal items like phones and keys.