I made a kid x-wing bike helmet for my nephew. I used a piece of orange mystery plastic that had been a clipboard. I used a heat gun at first but it warped the plastic. I then made a mold and used the oven at low temp. It worked, but it became more translucent instead of clear. It is fine for a kid, but I would love to know how people make the glass parts of molded helmets. I wish I had more info on the type of plastic.