Why are NFL players wearing padding on helmets at training camp?
Bills $20 Million Starter Reveals He Underwent 2 Offseason Surgeries
Wake Up Washington Commanders adjust to guardian caps at first practice of training camp
Cowboys, other NFL players wearing padded caps over helmets
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
Minicamp Notes: Rookies Shine In All Three Phases
NFL hopes to reduce head injuries with 'goofy' helmet experiment
NFL players wear Guardian Caps to reduce head trauma during training camp