Former Bills DB Mark Kelso backs company developing helmet cap
Football helmet question that I'm sure has been asked. - Octopus Overlords
What Drama? It's Business As Usual at Patriots Camp - Sports Illustrated
Daniel Thomas returns from second concussion with oversized helmet - NBC Sports
Kevin O'Neill on X: Antonio you can play for the Bills but for the NFL minimum and you have to wear a Mark Kelso helmet. / X
NFL's use of Guardian padded helmet caps in camp draws support and skepticism - The Athletic
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]
Buffalo Bills vs Chicago Bears: Time, TV, radio, game information
A Deep Dive on the Bills' Red-Helmet Era - by Paul Lukas
The Bills New Training Camp Helmets Are Absolutely Brilliant