Sketch out your design. We found it helpful to draw on top of a picture of a bike helmet.

Start creating your design with stiff wire and a heavy pair of pliers. Wear safety glasses.

When attaching to the helmet, loop through the vents and tightly twist the wire to secure in place.

On the inside of the helmet, move any foam pads to cover the wire, especially right in the forehead.

If your wire is wiggly, you can make a Z curve in it with a pair of pliers. This uses up the wire slack, removing wiggle.

It can be helpful to try the helmet on to see where the features of your mask will end up in relation to your head.