I'm sure you have seen some of these around -- they are oval in shape, self-stick, and say "26.2" on them. Some have a border, others don't. This one is white, with black lettering.
It was a tricky decision as to whether to get the self-stick oval 13.1 sticker, or the self-stick oval 26.2 sticker. In the end, I wanted everyone to realize I had done a 'thon, so I got the 26.2 sticker.
I have seen some people with both a self-stick oval 13.1 sticker, and the self-stick oval 26.2 sticker. That seems repetitive, as anyone who has done a full 'thon has also done a 13.1 mile half 'thon -- twice!
This isn't to be smug, or anything like that. I know there are lots of other 'thoners out there. But now as I drive around, there will be other drivers who will either know that I am part of the 'thoner club, or some drivers who don't know what that self-stick oval 26.2 sticker means. Either way, they'll have something to think about.