Clear shields are generally used for night racing or very low light conditions
Some people find that mirrored shields block even more sunlight than tinted shields and Iridium shields provide the most protection from both sunlight and glare
Yellow visors are commonly worn during early morning or late evening driving, as they highlight the characteristics of the track.
Amber shields provide a minimal amount of tinting that's ideally suited to overcast weather
Tinted shields can help to eliminate glare during daytime driving