Tua's helmet (description in post) : r/miamidolphins
Football Helmet: Most Up-to-Date Encyclopedia, News & Reviews
VICIS Unveils Revolutionary Football Helmet
New NFL Helmets: Will the Quarterback Special Helmets Aid in Preventing Concussions? - The SportsRush
Frontiers Finite element evaluation of an American football helmet featuring liquid shock absorbers for protecting against concussive and subconcussive head impacts
VICIS inks deal with Oakley to create advanced eye shield for high-tech football helmet – GeekWire
Seattle-based VICIS unveils new design for football helmets
The NFL's Quest for a Better Football Helmet - Sports Illustrated
Guardian Caps Guardian Sports
NFL at 100: Helmets go high tech in quest for player safety – Macomb Daily
Football helmet - Wikipedia