Why footballers wear GPS tracker vests

Footballers wear cropped GPS tracker vests, often mistaken for sports bras, to monitor performance.

The vest positions a GPS device between the shoulder blades to record distance, sprint speed, acceleration, workload, and movement patterns.

Data collected is used to customize workouts, monitor fatigue, and reduce injury risks.

The crop-top design keeps the device secure during sprinting.

The football GPS vest is part of a wider trend of athletes using wearable tech, such as Novak Djokovic's ear seeds and Alexander Zverev's glucose monitor.