Vicis ranks first in 'extensive' NFL helmet test that assesses head impact severity – GeekWire
Virginia Tech Helmet Ratings
Youth Football Helmet Ratings
Development and Evaluation of a Test Method for Assessing the Performance of American Football Helmets
Virginia Tech Helmet Ratings
Built By Data: NFL Helmet Innovation
The Helmet Lab, bold.beam
Comparison of Laboratory and On-Field Performance of American Football Helmets
NFL, NFLPA Release 2019 Helmet Laboratory Testing Performance Results