The Fox Deluxe Goggles feature Photochromatic lenses which are made of a special, durable, photosensitive material.  The lenses adapt to different lighting conditions and lighten or darken accordingly. 

This is a perfect solution for those people who are sensitive to the light and that want a pair of goggles that are ideal for both indoor and outdoor use.
 
The special lenses also offer excellent protection against UV rays and have particularly resistant, internal, anti-fog treatment.