SD1 Helmet Replacement Shield Antifog/Scratch - IridiumSimpson helmet shields are offered in clear as well as stylish and functional tints. When ordering a shield for your racing or motorcycle helmet, keep these considerations in mind: 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 shields are often used in dawn or dusk driving, as they tend to accentuate track features.