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Rawlings Football 2016
Head Impact Exposure in Youth and Collegiate American Football
Guardian Caps Guardian Sports
PDF) Investigation of linear impact energy management and product claims of a novel American football helmet liner component
Flow of identification, screening, eligibility and inclusion for
PDF) Efficacy of Guardian Cap Soft-Shell Padding on Head Impact Kinematics in American Football: Pilot Findings
Comparison of Laboratory and On-Field Performance of American Football Helmets
The temperature inside football helmets during head impact: a five
Age of first exposure to American football and reported symptoms of
Neutral position and impact sites for laboratory linear impactor
Headgear models worn for the study
Guardian Caps: Why some NFL players are wearing them in training camps, Helmet Padding
Guardian Caps: Why some NFL players are wearing them in training
Cross-sectional images of helmets without a rotation-damping system
Laboratory Evaluation of Shell Add-On Products for American Football Helmets for Professional Linemen