New generation lens which combines the technological features of polarized and photo chromic CRX lenses. The lens is double: the inner lens is polarized: it absorbs light glares and removes the dazzle; the yellow photo chromic outer lens is activated by sun lights and change its colour according to the weather conditions. The photo chromic lens passes from category S2 to S3 when the temperature is lower than +10°, from S2 to S4 when the temperature is lower than -5°. When the altitude is over 2.000 mt, with UVB rays, it passes from S2 to S4 with any temperature.