Some think the extra layer makes a positive difference while others believe it could have a negative effect.
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
What's with padded helmet caps teams are wearing
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NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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Padded helmet cover shows little protection for football players - Scope
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Guardian Cap: What are and why the NFL asks this safety measure in helmets
NFL CMO Dr. Allen Sills explains importance of mandated guardian caps during training camp
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