I have seen several of the expats (but no co-workers, yet) in Port Gentil wearing these wristbands. I could never get a good look at them, but eventually came to learn that there are from Power Balance. Screw it, just read the first paragraph of the Wikipedia entry. Seriously, go there now and then come back.
Hahahahaha. Holographic technology? Energy field? Ah hahahahahaha. But see, that's not the best part. It's how I came to learn about what those bands are because I stumbled upon an article which then led me to Power Balance's Australian website where they have to admit that their bands do nothing:
We admit that there is no credible scientific evidence that supports our claims and therefore we engaged in misleading conduct in breach of s52 of the Trade Practices Act 1974.
Now I know an easy way to identify at least some of the retards I work around.