Guardian Caps Exceed NFL's Expectations - Guardian Sports
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
What is a Guardian Cap? Meet the NFL's newest safety measure
NFL] When worn, 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
NFL Health and Safety Fact Sheet
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL Guardian Caps: How Do They Work? – NBC10 Philadelphia