I used to use the plastic cuffs that you had to maneuver onto the legs. They worked pretty well but degrade from the sun and weather. I've seen some metal bands, but don't know which are better for not only longevity but also keep their markings for easy ID, comfort, and less likely to fall off.
...and, of course, where is the best place to get them?
...and, of course, where is the best place to get them?