I’m running my first 5K tomorrow and noticed they were using RFID embedded plastic timing chips! They’re pretty cool:


They sealed an RFID chip into this plastic strip, and there is adhesive on one end to attach it to your running shoe:

I wonder if they will start using these for triathlons. They look like they would be waterproof, but the strap would have to be longer and different to go around your ankle. But definitely they should work for run races.
Looks like they’re powered by RFID chips from Impinj.