Funky-Looking Guardian Caps Rejected by NFL for Regulation Play, OK'd for Practice - Core77
Football Guardian Cap draws mixed reviews from players, experts for safety effectiveness - The Daily Tar Heel
NFL exec suggests Guardian Caps worn to protect players during practices could one day debut in games
Guardian Cap: What are and why the NFL asks this safety measure in helmets
Ban on helmet covers sparks controversy
NFL Makes Ruling On Players Wearing Guardian Cap During Game - The Spun: What's Trending In The Sports World Today
Jonathan Allen clearly isn't a fan of NFL's mandated safety helmets
NFL on X: The Guardian Cap results in at least a 10% reduction in severity of impact if one player is wearing it, and at least a 20% reduction in impact if
Guardian Caps NFL: What player positions are required to wear them?
NFL expands rule against misuse of helmet; Guardian Caps required in regular season, postseason