2nd Skull Pro Cap - Impact Reducing Protective Headwear – 2nd Skull, Inc.
Shell game: Player safety looming concern as football season approaches, Local Sports
N.F.L.'s Concussion Protocol Under Scrutiny After Tagovailoa Injuries - The New York Times
The 2023 Uni Watch NFL Season Preview - by Paul Lukas
What's with padded helmet caps teams are wearing
Shell game: Player safety looming concern as football season approaches, Local Sports
NFL faces intense scrutiny over concussion protocols
Helmet evolution to reduce concussions visits SEC
ProCap Football Helmet Accessory
ProCap Football Helmet Accessory - Mark Kelso pioneered the use of the ProCap in the NFL. After suffering numerous concussions, the Bills trainer, Ed Abramowski [dean of NFL trainers at that time]
NFL Accused Of Rejecting Safer Headgear
This flexible football helmet wants to save your brain : r/nfl
Urethane Football Helmet Design to Reduce Concussions - The Urethane Blog