This undated file photo shows football player Harold "Red" Grange. How NFL equipment has changed in the league’s 100 seasons The players' looks through the decades have changed so much, it's tough to believe it's all the same sport. From the crude, oblong leather helmets to the sparsely padded brown and blue vertical-striped uniforms of the Chicago Bears, it's easy to see how equipment has drastically evolved in the NFL since the days of … FILE - This is a Sept. 13, 1930, file photo showing Chicago Bears professional football players Red Grange, left, and Bronko Nagurski. The NFL began its countdown of the 100 Greatest NFL Games, and there were six games involving the Bears that made the list. FILE - This is a Sept. 13, 1930, file photo showing Chicago Bears professional football players Red Grange, left, and Bronko Nagurski. 6 Bears games land on list of 100 Greatest NFL Games, No. FILE - This is a Sept. 13, 1930, file photo showing Chicago Bears professional football players Red Grange, left, and Bronko Nagurski. Red Grange, one of the league’s first stars, played most of his career before the adoption of the NFL’s own rule book. The NFL Top 100 Games celebrates 100 years of NFL history by choosing the top 100 games of all time. 100 … Photo: Getty images The NFL celebrates its 100th season this year, but the league’s rule book won’t reach that milestone till 2033.