The New NFL Uniforms and Throwbacks Ready to Take the Field - Boardroom
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Eagles, Jets, Bengals unveil alternate helmets - The Athletic
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The Official Uni Watch 2021 NFL Season Preview - InsideHook
Ranking the New NFL Alternate Helmets – The Register Forum
Ranking New NFL Helmets - Sideline Cue
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Alternate helmets approved by NFL for use with throwback uniforms in 2022 - ESPN