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.

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.

Jamison Hensley Dec 13, 2017, 07:21 PM ET Baltimore Ravens running back Alex Collins acknowledged that he's wearing a dark visor on his helmet to help his long-time migraine battle.

Read “Tom Brady Unveiled A Dark Visor On Bucs Helmet At Practice (PICS) ” and other NFL, Tampa Bay Buccaneers articles from Total Pro Sports.

Baltimore Ravens running back Alex Collins acknowledged that he's wearing a dark visor on his helmet to help his long-time migraine battle. Collins got approval from the league during the ...