The pouch on the back of rugby shirts is a visible part of a sophisticated biometric tracking system used by coaches to track a variety of statistics about every player. The padded casing surrounds a unit that is commonly referred to as a GPS tracker, although it contains other measuring devices. The GPS tracker is an important piece of kit that is used to manage a players workload to make sure that they stay healthy and able to perform at their peak for the entire season. The device can measure a lot more than just the position on the pitch, including distance, speed, levels of fatigue, and injury risk. The device is secured to a players person via a pouch incorporated into the rear of the players jersey or a harness worn by the player under the jersey. The pouch must be small enough to ensure that the device cannot rotate on any axis while worn by the player.