NFL, NFLPA Release 2020 Helmet Laboratory Testing Performance Results
NFL to prohibit use of certain helmets for 1st time
Helmet Laboratory Testing Performance Results
Vicis ranks first in 'extensive' NFL helmet test that assesses head impact severity – GeekWire
Vicis high-tech helmets take top 3 spots in NFL's annual performance ranking of equipment – GeekWire
Tactical Helmets: Testing & Ballistic Protection Levels
2019 Helmet Laboratory Testing Performance Results
Varsity Football Helmet Ratings
The Helmet Lab, bold.beam