what do rugby players have in the back of their shirts
In rugby, the little bump on the back of some shirts is usually a GPS tracker pouch or a sensor pocket used to collect performance data like distance covered, speed, and workload.
Quick scoop
It is not part of the shirt design for fashion. It is there so teams can monitor players’ movement and fitness during training and matches.
What it does
- Tracks running distance.
- Measures speed and acceleration.
- Helps coaches manage player load and recovery.
Why it looks like a lump
The device sits in a small padded pocket or casing between the shoulder blades, which makes it visible as a rectangular bump on the jersey.
If you want, I can also explain why rugby shirts are so tight or what the numbers on rugby shirts mean.