In name of safety, Steelers debut astronaut-like helmet protective coverings at minicamp
First QB helmet designed to help reduce concussions approved by NFL, NFLPA
NFL to Expand Guardian Cap Wear in 2023 - Steelers Now
Guardian Caps: Why some NFL players are wearing them in training camps
NFL players don Guardian Caps, designed to protect from concussion
CQ Researcher - Sports Safety
Seeking to reduce head contact, NFL mandates use of Guardian Cap helmet for early portion of training camp - ESPN
NFL Makes Ruling On Players Wearing Guardian Cap During, 42% OFF
NFL to Expand Guardian Cap Wear in 2023 - Steelers Now
Football helmet - Wikipedia
A shocking resolution regarding Guardian Caps is being considered by the League. - The Wood Cafe
Steelers' new headgear will protect their noggins during off-season training
Guardian Caps - Are the soft-shelled football helmet covers effective at limiting head injuries? - ESPN
Guardian Cap Debuts at Training Camps League-wide
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety