Quarterback-specific helmet to be available during 2023 NFL season
EXPLAINER: NFL using helmet caps for player safety, research
Bombers welcome introduction of new safety gear – Winnipeg Free Press
Large Bubble Helmets Are Guardian Caps, NFL's New Safety Measure
Arizona Cardinals defensive end J.J. Watt not fan of the new league-mandated Guardian Caps on helmets
Guardian Caps debut at training camps throughout NFL
Parents, players try to make sense of helmet products
Guardian Cap Use a Concern for Watt, Saleh Early in Training Camp - Sports Illustrated
Guardian Caps', NFL's Most Recent Attempt At Preventing Head Injuries
Finite Element Models: New Tools for Innovation in Football Helmet Design
These puffy helmet caps are the next big thing in NFL player safety, National Sports
Can new technology help cut down on concussions? (video)