Clear shields are generally used for night racing or very low light conditions
Amber shields provide a minimal amount of tinting that's ideally suited to overcast weather
Yellow visors are often used in dawn or dusk driving, as they tend to accentuate track features
Tinted shields can help to eliminate glare during daytime driving
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