Behind the scenes as Michigan's equipment staff keeps football team humming
Inbox: He's going to be a real challenge for defenses
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
High school football is almost here. The issue? There aren't enough helmets. - The Boston Globe
About the NFL Helmet Challenge
NFL Helmet Challenge Raises the Bar for Helmet Technology and Performance, Awards $1.55 Million in Grant Funding to Help New Models Get on Field Faster
Helmet Innovation: More and Better Choices, Fewer Concussions
NFL hopes to reduce head injuries with helmet experiment
Introducing the NFL Helmet Challenge DfAM eSeries, nTop
Guardian Caps Guardian Sports
Football STEM Challenge! — Vivify STEM
Explaining the NFL's latest concussion controversy and policy change : NPR
Aaron Rodgers' football legacy could soar with the Jets if he wins in the Big Apple
NFL quietly tweaked lowering of helmet rule for 2022 - NBC Sports