The Oakley Football Eyeshield - 20 Percent Grey puts a dark tint on one of the top visors in the game. The 20 percent grey tint is the darkest of the Oakley visors and is best for players with sensitive eyes playing in medium to bright lights. High Definition Optics (HDO) eliminates the distortion found in traditional polycarbonate visors with a unique injection molding process which shapes the shield with a unique curvature. The contours are designed to provide clarity at all angles of vision so peripheral vision is optimized. All visors block 100% of UVA, UVB, UVC and harmful blue light up to 400nm. Constructed of Plutonite, a proprietary synthetic that is extremely durable and won't chip, crack or shatter. The AFR lens treatment prevents fogging. Tinted visors may not be approved for play in your league without a medical reason. Please consult your specific league rules for more information.