Ключевые слова: american football, athletes, athletic, chin straps, college, competition, contact sport, equipment, field, football, football season, game, game day, gear, grass, gridiron, hard shells, headgear, helmet design, helmets, impact, kickoff, league, match, nfl, outdoor, players, protection, protective gear, rivalry, safety, sports, sportsmanship, sportswear, stadium, tackle, team, uniform,