Why is Germany's Antonio Rudiger wearing a face mask at Euro 2020?

If you've been paying close attention to Germany at Euro 2020, you'll have noticed that their defender Antonio Rudiger is wearing a mask while he plays.
If you've been paying close attention to Germany at Euro 2020, you'll have noticed that their defender Antonio Rudiger is wearing a mask while he plays.

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Why is Germany's Antonio Rudiger wearing a face mask at Euro 2020?