Amazon.com : EVT Safe Zone Bicycle Helmet Mirror : Bike Mirrors : Sports & Outdoors
Amazon.com: Helmet Mirror for Bike 360 Turnable Adjustable Lightweight Rear View Bicycle Mirror Helmet Mount Cycling Accessory for Road Bike MTB Easy to Install by Ryders Recreation : Sports & Outdoors
Reevu MSX1 helmet gives riders a nice view of their behinds [w/video] - Autoblog