Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
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Guardian Caps: Why some NFL players are wearing them in training camps
Guardian Caps debut at training camps throughout NFL
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What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Guardian Cap Debuts at Training Camps League-wide
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NFL training camps: Guardian Cap players are wearing over helmets, why
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact