The category 1-3 photochromic lens tints according to ambient light

and filters up to 92% of sunlight; it adapts to changeable conditions (cloud, rain, fog) or your route (wooded sections, shaded areas, tunnels).

The PersoEvo4 glasses are featherweight (28 g) and highly vented (4 vents on the central frame, and 8 on the lens).