Sound activated light up mask! Built on electroluminescent technology (EL). There is a pocket in the back of the mask that holds the battery compartment (2 AAA batteries. Batteries NOT included). There is an on and off switch as well as a dial to adjust the sound sensitivity. It will light up from your voice or from surrounding music.
The light up graphics piece is connected via velcro to the face mask and it all unplugs so you can wash the mask separately from the electronics. The wires, battery pack, and graphic piece should not be submerged in water.
One size fits most. The mask connects around the back with velcro, so you could add some velcro if it is too big. My 10 year old son wore this over the winter on top of his regular ski mask and helmet and it fit just fine. He's also able to wear it directly on his face when playing with his friends during summer nights or if they are having a lights-off nerf gun battle.