49ers news: NFL players to wear decals bearing names or initials to salute victims of police brutality - Niners Nation
NFL to celebrate league's international diversity with helmet initiative in Weeks 4, 5
A Deep Dive on NFL Rear-Helmet Numbers
A Deep Dive on NFL Rear-Helmet Numbers
What exactly is the new 'helmet rule' in the NFL? - Quora
Do NFL players have headphones in their helmets? - Quora
New Illini Football Helmets Tell a Story About the Program's History - University of Illinois Athletics
Why would Joe Rogan say that leather football helmets were safer than modern helmets? - Quora
A Deep Dive on NFL Rear-Helmet Numbers
Ask Farmer: Why are so many players' helmets coming off this year? - Los Angeles Times
NFL players sporting Oakley visors - All About Vision
An Inside Look at the Riddell Axiom Helmet - Boardroom
N.F.L. Adopts Helmet Rule and Alters Tuck Rule - The New York Times
See the new football helmet that got funding from the NFL