Notes
Riddell RT2 Helmet, Riddell original photo, 1939, content.riddell.com/history/
Riddell TAK-29 Helmet, Riddell original photo, 1963, content.riddell.com/history/
Riddell VSR -4 Helmet front photo, Riddell original photo, 1992, content.riddell.com/history/
Riddell VSR -4 Helmet side photo, TimeToast image, 1992, Football Helmets Over Time timeline | Timetoast timelines
Riddell Revolution IQ Helmet front photo, Riddell original photo, 2007, content.riddell.com/history/
Riddell Revolution IQ Helmet bottom photo, Riddell original photo, 2007, content.riddell.com/history/
Riddell Revolution IQ Helmet fitting, Riddell original video, 2007, Riddell Revolution IQ Helmet Fitting Guide (youtube.com)
Riddell Axiom Helmet, Riddell original photo, 2023, Axiom Helmets | Riddell Newsroom
Riddell Axiom Video, Riddell original video, 2023, Riddell | Axiom
NFL Injury Data 2015-2023, NFL data, 2023, Injury Data Since 2015 (nfl.com)
Bibliography
Anon. Axiom Helmets. Riddell Newsroom. https://news.riddell.com/multimedia/image-library/axiom-helmets.
2020. Riddell.com. 2020. https://content.riddell.com/history/.
Moore Center. 2012. Riddell Revolution IQ Helmet Fitting Guide. Video. YouTube. 21. February. https://www.youtube.com/watch?v=jn9FRpA_270.
Nfl. 2024. Injury data since 2015. NFL.com, 2. February. https://www.nfl.com/playerhealthandsafety/health-and-wellness/injury-data/injury-data.
RiddellSports. 2022. Riddell Axiom: The future of elite performance. Video. YouTube. 5. January. https://www.youtube.com/watch?v=O39tNFJ_ESs.
Timetoast. 1896. Football Helmets Over Time timeline. Timetoast Timelines. 10. October. https://www.timetoast.com/timelines/football-helmets-over-time.