Plazma balances between being classic sunglasses and sports glasses. The glasses are inspired by the classic Hijinx glasses from Oakley and are extra solid sunglasses. The design of these glasses means that it fits just as well on a mountain hike, on the beach or on a run in the countryside.. The lenses in these glasses are of the type Clear-Black Photochromic. This means that they are basically completely transparent, but when they are exposed to UV rays, they gradually become darker. Which in practice means that the stronger the sun is, the darker the glasses become. With maximum UV exposure, the lenses will become completely dark gray sunglasses. Which thus gives you the complete sports glasses adapted to all lighting conditions. The light transmission in this glass will vary with the solar conditions, and so will the contrast level.