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Why do footballers use vests?
Amazon.com: SOCCERBEE GPS Tracker and Vest for Soccer Players (Extra Small) : Electronics
Amazon.com : STATSports APEX Athlete Series GPS Soccer Activity Tracker Stat Sports Football Performance Vest Wearable Technology Adult Small : Sports & Outdoors
STATSports Apex Athlete GPS Performance Tracker Junior | SportsDirect.com USA
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Amazon.com: SOCCERBEE GPS Tracker and Vest for Soccer Players (Extra Small) : Electronics