Stilo Helmet Visor for ST5 Helmet, Iridium Red, Dark Level These visors are designed for use with Stilo ST5 GT helmets and offer an application for just about every lighting condition you'll encounter. Clear visors are generally used for night racing or very low light conditions. Amber visors provide a minimal amount of tinting that's best suited to overcast weather. Yellow visors are often used in dawn or dusk driving, as they tend to enhance track features. Tinted visors are available in several different levels of tint which reduce glare during daytime driving. Mirrored shields normally block out even more sunlight than tinted shields, but ultimately iridium shields provide the most protection from sunlight and glare.