what is bib in marathon

In a marathon, a bib is a numbered tag that identifies a runner during the race. It is one of the most important items that a runner wears while participating in a running race, as it is used to track the runners time. The tracker in the bib connects with timing mats placed throughout the race, and the data is saved as proof that the runner was there and maps if they have run the entire course. The bib also acts as evidence that the runner has crossed the finish line. The bib number for the race must be visible, so runners need to be cautious about where they are pinning their bibs. Bibs are typically pinned over the abdomen and secured with four or more safety pins, but clips, running tape, and toggles may also be used to hold the bib in place without puncturing the shirt. In marathon racing, bibs are a matter of practicality, as they provide a standardized disposable tracking system like RFID tags to signal the runners location along the course when they cross over mats placed throughout the race.