Why are NFL players wearing padding on helmets at training camp?
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Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
NFL hopes to reduce head injuries with helmet experiment
What are Guardian Caps and how are they helping football teams?
NFL hopes to reduce head injuries with helmet experiment
How a soft-shell helmet is limiting the risk of concussions at Rutgers football camp
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Caps: Why some NFL players are wearing them in training camps
Here's why some Patriots players are wearing caps over their helmets during training camp
Steelers debut new, safer helmets for off-season training
Browns wearing Guardian Caps during training camp
