The Overlay innovates by going from clear to dark smoke in a matter of seconds, using a photochromatic film with UV protection sandwiched between two polycarbonate layers with anti-scratch coating.

AGV Miglia II Face Shield, Eye Port, Visibility and Rotating Visor The face shield on the Miglia II is very similar to the face shield used on the original Miglia. It does not have a quick release, ...

The tint can be zero, as in clear visors, half-dark and full-dark. Obviously the full-dark retains decent visibility to keep things in the safe zone.

This training camp, it feels as if more Seahawks than ever are practicing with tinted visors. Which is interesting, because in 1998 the NFL banned dark visors on game days.