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NFL prohibiting non-standard facemasks
Pro Football Journal: Last Players To Not Wear Facemask
Pro Football Journal: Facemask Oddities
How to get the same face coverings and gaiters that NFL players are wearing on the field
Football Facemask Penalty
NFL Says Customized Face Masks Are Not Allowed - CBS Baltimore
Pro Football Journal: Facemask Oddities
The REAL REASON the NFL Banned these AWESOME Customized Face Masks