Custom fit helmets – can they help protect against concussions? - pro2cool®
It's been devastating': former NFL players count the cost of concussion, Concussion in sport
The Fruitless Search for a 'Concussion-Proof' Football Helmet - The Atlantic
NFL Sees a Drop in Concussions, But Problems Linger
New Football Helmet Could Save the Sport
New football helmet made in Akron could reduce concussions
NFL Helmet Challenge Raises the Bar for Helmet Technology and Performance, Awards $1.55 Million in Grant Funding to Help New Models Get on Field Faster
Guardian Caps Guardian Sports
New Football Helmet Standards To Take Effect In 2018