Sometimes you can notice a little nob on the back/shoulder of a player.
https://www.google.com/search?q=nhl+player+tracking+jersey
https://old.reddit.com/r/whatisthisthing/comments/u5707w/wha...
Sometimes you can notice a little nob on the back/shoulder of a player.
https://www.google.com/search?q=nhl+player+tracking+jersey
https://old.reddit.com/r/whatisthisthing/comments/u5707w/wha...