Padded helmet cover shows little protection for football players - Scope
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, a soft-shell helmet cover, among CFL's new player-safety initiatives | CBC Sports
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
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NFL executive hints that Guardian Caps could eventually be worn in games, along with position-specific helmets - CBSSports.com
Ravens Embrace the Funny-Looking Guardian Helmets - Sports Illustrated Baltimore Ravens News, Analysis and More
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
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What are Guardian Caps? NFL players sport specialty helmets for 2022 minicamp | Sporting News
What Pros Wear: Guardian Caps | What are Those Helmet Covers Being Worn in Practice? - What Pros Wear
EXPLAINER: NFL using helmet caps for player safety, research | AP News
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Guardian Cap debuts during minicamps in effort to reduce avoidable head contact
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Why are NFL players wearing padding on helmets at training camp?
Concussions among players who wore Guardian Caps over summer dropped more than 50%, NFL says - ESPN
