Take A Look Compact Cycling Mirror

The Compact Mirror attaches to sunglasses or a helmet to allow cyclists and other outdoor enthusiasts to see behind them without turning their heads, much like a rearview mirror on a car. The Compact Mirror works best on regular glasses or a helmet and does not work with wrap around glasses. Our site is the only place where you can also customize the length of the stem. Other features include:

Vibration-free
Three pivot points for optimal adjustability
Frameless mirror means uninterrupted field of vision
Compact size provides a wider field of vision than the Original Mirror