A Single Lens: Single antifog lenses are coated with an antifog film that increases the antifogging properties of the lenses. They are available in different colours (refer to lens types) to guarantee the best vision in all weather conditions. CRX Lens: These lenses optimize the protection against dazzling light and glare/enabling the wearer to go from a foggy to a sunny area and back or from an area of shade to a brighter area and back without having to remove the goggles. Fit for 1-4 years