Guardian Caps Debut at Training Camps Across the NFL
Steelers debut new, safer helmets for off-season training
If a player wanted to wear a Guardian Cap during a game, the league would prohibit it - NBC Sports
What Pros Wear: Guardian Caps What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
Carolina Panthers NFL helmets training camp
Guardian Caps Guardian Sports
NFL says positions wearing Guardian Caps saw 52% decrease in concussions - NBC Sports
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Guardian cap' to prevent head injuries mandated for practices, CFL says
The story behind those soft-shell puffy Guardian Caps players have been wearing
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic