If you're tracking the performance of your players you'll need a sports vest with a reliable wearable sensor to collect all of the data you'll need.
Men's soccer sports bras: Why are they wearing those GPS harnesses?
PitcheroGPS - GPS Sports Tracking Vest
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STATSports Vest
SOCCERBEE Vest for GPS Wearable Tracker (Extra Small) : Electronics
CATAPULT PLAYR Soccer Fitness Tracker - GPS Vest and App to Track and Improve Your Game - for iPhone and Android (S) : Sports & Outdoors
STATSports APEX Athlete Series GPS Soccer Activity Tracker Stat Sports Football Performance Vest Wearable Technology Adult Small : Sports & Outdoors
CATAPULT PLAYR Soccer GPS Tracker - GPS Vest and App to Track and Improve Your Game - for iPhone and Android (M) : Sports & Outdoors
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GPS Tracking in Soccer: How can a team use GPS to improve performances?
Will fit module upto 7cms across x 9cms down.
GPS Tracker Sports Vest
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SOCCERBEE LITE GPS Soccer Activity Tracker Sports Football Performance Vest Wearable Technology (Small) : Electronics