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The NFL and its helmet manufacturer Oakley are testing helmets with N95 material facemasks built in, according to NFL Players Association Medical Director Thom Mayer.
With many sporting events postponed or cancelled because of the coronavirus pandemic, the NFL is still hoping to start its season on 10th September.
Mayer said: "They've got some prototypes. They're doing really good work. Some of them, when you first look at them, you think, 'Gosh, no' cause you're not used to seeing it.
“But they're looking at every issue you can imagine, including when it fogs up. What do we do with that? But these guys are used to dealing with this stuff."
Engineers at both the NFL and Oakley, who make all of the face visors for the league’s helmets, are said to be working together to make prototypes that could be used for the 2020 season.