Polycarbonate is particularly effective as a sunlens.  The safe choice for children and athletes.

The features:
1. Unbreakable, Provide the ultimate in impact resistance, better for sports, safety sunglass.
2.100% UV protection in optical class 1.
3. Various colors for choice.
4. Anti-fog available. 
5. Easy with a wide range of performance coatings: Anti-reflective, Multi-layered coating, hydrophobic.  Of course, for the normal coating: flash mirror & gradient mirror.