Why do footballers wear GPS vests?

Explained: Why are footballers wearing 'sports bras' at FIFA World Cup? – Firstpost

What is the vest that soccer players wear? - Quora

STATSports X FC Utrecht High Performance Preparation for Athletes

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Why are they wearing those GPS vests during a football game? — GI-technology in modern-day soccer – GoGeomatics

Why are they wearing those GPS vests during a football game? — GI-technology in modern-day soccer – GoGeomatics

How the Premier League's wealth funded a revolution in training technology

CBF x STATSports: How Brazil prepare Neymar and co. with GPS technology

Phil Foden - Does GPS Make You A Better Player? #shorts