Included in that category is the Riddell Axiom 3D, which topped the safety ... Schutt F7 2.0 and Riddell SpeedFlex — included in this year’s “Not Recommended” category.

The Broncos, working with helmet manufacturer Riddell, have arranged for 15,516 Riddell Axiom helmets to be available to all 277 high-school football programs through the state. They're calling it ...