Have you guys tough of
Polycarbonate ?
"At a thickness of .033", Redco™ Polycarbonate sheet can withstand over 240 inch-pounds of impact. This equates to a 3/4" hailstone falling at 96 miles per hour! Redco™ Polycarbonate sheet maintains this superior impact resistance at temperatures ranging from 40°C to 250°C."
You could also buy Safety goggles and cut/modify them to fit in the fogs.