Patriots, rest of NFL wearing cushioned helmet caps at training camp, per new mandate - CBS Boston
Jason Kelce - NFL Center - News, Stats, Bio and more - The Athletic
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Coverage of the NFL in Guardian Caps
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What are the padded helmets players are wearing at NFL training camps?
NFL players wear Guardian Caps to reduce head trauma during training camp
Guardian Cap Debuts at Training Camps League-wide
Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77