Confused by the giant weird helmets NFL players are wearing? We got you.

SAN FRANCISCO — The NFL is challenging innovators to improve the facemask on football helmets to reduce concussions in the game. The league announced on Friday at an innovation summit for the Super ...

The N.F.L. claims Guardian Caps reduce the risk of concussions. The company that makes them says, “It has nothing to do with concussions.” ...