Guardian Caps: Why some NFL players are wearing them in training camps
Guardian Caps: NFL requires use of helmet cover at training camps to reduce head injuries
Detroit business Xenith wins $496,500 to help improve NFL helmet safety
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
This Helmet Will Save Football. Actually, Probably Not. - The New York Times
Puffy, spongy Guardian Caps could help curb NFL head injuries - The Washington Post
Built By Data: NFL Helmet Innovation
NFL hopes to reduce head injuries with helmet experiment
Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
Finite Element Models: New Tools for Innovation in Football Helmet Design
Pittsburgh Steelers Players React to New Guardian Helmets - Sports Illustrated Pittsburgh Steelers News, Analysis and More
What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp | Sporting News
The safest helmet in football: What's inside the NFL's newest headgear - CBSSports.com
NFL hopes to reduce head injuries with helmet experiment | The Seattle Times
NFL players don Guardian Caps, designed to protect from concussion
NFL Introduces New QB Helmet for 2023 Season - Boardroom
Guardian Cap Debuts at Training Camps League-wide
Steelers debut new, safer helmets for off-season training | 90.5 WESA
VICIS has top 3 helmets in survey including lineman model
NFL helmet safety testing results: Vicis ranks first again for its high-tech head protector – GeekWire
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
NFL hopes to reduce head injuries with helmet experiment
