2010 USATF National Junior Olympic Cross Country Championships

Each athlete must wear one data tag on each shoe. One data tag may be kept as a souvenir and athletes must return the other data tag to the event organizers in the finish ...

http://www.usatf.org/events/2010/USATFJuniorOlympicXCChampionships/images/2010%20JOXC%20Passport.pdf