Keep an eye on the traffic behind you with the Heads Up Eyewear Mounted Mirror from Cycle Aware. Weighing in at a scant 0.1-ounces, this eyeglass mounted mirror allows you to remain aware of anything coming up behind you while you focus on the road ahead. The mirror is constructed of strong, lightweight, safe-to-wear polycarbonate composite and Kraton. Designed for easy mounting, removal, and adjustment, the mirror will not vibrate as you ride and will not damage your glasses. If you need to adjust it, simply bend it slightly to maximize the field of vision from the oval mirror. When you're ready to get off your ride, simply un-clip the mirror from your glasses.Cycleaware Heads Up Eyewear Mounted Mirror Features:Rear-view mirror for biking--mounts to any eyeglassesStrong, lightweight, safe-to-wear polycarbonate composite and Kraton constructionNo vibration; will not damage glassesRemovable/adjustable; hassle free installationWeighs just 0.1 ounce (3.1 grams)