The 
NUPROL Battle Pro's Red -Clear - w-Insert
 are CE EN166 rated safety glasses for airsoft and similar activities, featuring both a yellow and a clear polycarbonate lens, and an included frame for prescription optical inserts. 
Key Features and Specifications
Safety Certification: The glasses are fully compliant with CE EN166 standards, with an impact rating of 'B'. This means the lenses can withstand an impact from an 0.86g ball traveling up to 120 meters per second (approx. 400 fps), which is suitable for airsoft use.
Lens Properties: Both the yellow and clear lenses are made from polycarbonate and feature anti-scratch, anti-fog, and UV400 protection coatings to ensure clear vision in various conditions.
Included Optical Insert: The product includes an optical insert frame that can be taken to an optician to have custom prescription lenses fitted, allowing users requiring vision correction to use the eye protection comfortably.
Design and Fit: They feature a lightweight, flexible polymer half-rim frame, a rubber nose gasket for comfort, and an adjustable elastic headband for a secure fit.
Lens Application:
Clear Lenses: Ideal for indoor use at CQB arenas or during night games.
Yellow Lenses: Enhance lighting contrast, making them perfect for overcast, dusk, or low-light conditions.