"About 35% of players upgraded [to higher performing] helmets," Stills said at the NFL's health and safety press conference. Those helmets include Riddell's Axiom, Xenith's Orbit Pro, VICIS' Zero2 ...

Advertisement The NFL ... use of Guardian Caps contributed to that drop. The league announced that 10 helmets are “Guardian Cap optional” now. Included in that category is the Riddell Axiom ...

All In, All Covered — the initiative the Denver Broncos Foundation announced Jan. 28 that plans to donate 15,516 new Riddell Axiom helmets across each Colorado high school program over the next four ...