Originally Posted by Helmet Head
I use the Take-a-Look mirror attached to my sunglasses.
Don't leave home without it.
Nice to agree with Helmet Head wholeheartedly for once.

Seriously, I'm a Take-a-Look convert. I originally got it to keep track of my better half during a recent century and took out commuting a couple of times for practice using it. I can't say that I've used it on rides with my road bike, but I take it every day for commuting, for sure!