1. George probably has it (but I have not clicked the link). They wear biometric devices that track all sorts of data during training and matches. It is really impressive what they record and how it allows the coaches, even on the fly, to analyze. I was on the bench at a Penn State match and the coach monitoring the devices was able to check on a player who was having irregular heart patterns.

  2. There are also the (looser fitting) colored bibs worn by players on the sidelines (over their regular jerseys), especially when warming up prior to a substitution. This is to make sure that they cannot be mistaken for active players on the field.

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