The NFL and NFLPA continue to evolve their testing around what are the best models of helmets for players to wear. The latest results of the joint testing done by the league and its players concluded a comprehensive new testing method that went beyond examining only new helmet models joining the market this year. All 35 models of helmets were tested and rated by biomechanical engineers appointed by the league and the players' association. Years of on-field data have helped engineers develop an improved testing model and more defined results. The three top-rated helmets for this year all come from Riddell.