VLT is a measurement that specifies the percentage of light coming through the lens and reaching your eyes. A totally clear lens for dark conditions typically have around 90% VLT and a very dark colored lens with mirror for sunny conditions may have down to 10% VLT. Most all round lenses will be found between 30 to 60 %. In POC's range you will find alternatives for all kinds of conditions.
Race skiers demand minimum refraction error, which is why POC's race-specific lenses are made using only a single lens. Single lenses are generally known to have poor anti-fog protection, but the base material and coatings chosen for POC´s race goggles are the best available.