What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
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Guardian cap' to prevent head injuries mandated for practices, CFL says
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL players wear Guardian Caps to reduce head trauma during training camp
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
What is a Guardian Cap? Meet the NFL's newest safety measure
NFL mandates use of Guardian Caps for training camp in 2022 - Cincy Jungle
Why are NFL players wearing padding on helmets at training camp?
Guardian Cap used by football teams to protect against head injury – The Denver Post