I really want to explore this concept more. The material that soda bottles are made of is super tough. It even stops bbs from a bb gun, or Airsoft bbs with not even a dent.
I might try to make a face shield for Airsoft with this...
If you have a soldering iron available, with a sharp pointy tip, try using it to poke a little hole at each end of each slit used to hold the headband. Do this first before cutting the slits. This will make a tiny ring of melted plastic that will reinforce the end of the slit so that it doesn't continue to tear out.
That's a good idea. If I can't find my soldering iron (which I never use) I will try heating something in the same shape over the stove. These glasses are a great idea.
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I might try to make a face shield for Airsoft with this...