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From a journo in Colorado

https://pbs.twimg.com/media/DWhSHZfVwAEdrnM.jpg

I'm guessing they can use the below to wear whatever



IFAB Laws of the Game
Page 56, item 4
https://www.canadasoccer.com/files/LotG_17_18_EN.pdf

It'll be something like the below that can be pulled up over most of the face and ears.
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