The story behind those soft-shell puffy Guardian Caps players have been wearing
Vicis expands helmet line with new soft 'cap' for practices, 7-on-7 and flag football – GeekWire
What's with padded helmet caps teams are wearing
NFL players beginning to adopt protective Guardian Caps over helmets at practice - NBC Sports
South Georgia football team hopes new helmets can reduce brain injuries
Eagles players on Guardian Caps: 'We look a little goofy,' but all for safety
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
What Pros Wear: Top 5 Helmets Rated by the NFL & NFLPA - What Pros Wear
Guardian Cap used by football teams to protect against head injury – The Denver Post
Why are NFL players wearing padding on helmets at training camp?
NFL Expands Use Of Guardian Caps In 2023 - Steelers Depot
Leatherhead to Radio-head: The Evolution of the Football Helmet, Arts & Culture