| I use one of these Hyper Optiks and find them very good.
What Fog City does is easily explained; clear vision even under the most difficult of weather conditions. How Fog City does it is much more complicated, but when you can't see, you can't ride and with a whole range of Fog City visor inserts available there is absolutely no need to compromise safety.
The Hyper Optiks insert also adds an extra dimension to vision technology, with its light reactive properties dealing with anything from bright sunlight to total darkness and, of course, with all the usual anti-mist properties of a standard Fog City Insert.
HYPER OPTIKS VISOR INSET
LIGHT REACTIVE - In sunlight it will change from a clear green to cobalt bluein seconds, and react according to the prevailing light conditions.
ANTI-FOG VISION - Proven solution to visor misting
UV PROTECTION - Absorbs over 98% of harmful UV rays and offers unprecedented optical faceshield performance.
HIGH PERFORMANCE - Instantly converts a clear visor into an all weather, all season anti-fog visor  | 
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