Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
NFL players wear Guardian Caps to reduce head trauma during training camp
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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Guardian Cap Debuts at Training Camps League-wide
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Guardian Cap Debuts at Training Camps League-wide
Guardian Caps: Why some NFL players are wearing them in training camps
What are Guardian Caps? NFL's latest padded helmets for added safety