Wristwatch your back.

If you’re still peeking over your shoulder when riding your bike, stop and reflect on this. RearViz's Arm Mounted Bicycle Rear View Mirror brings you a superior rear view, without crowding your handlebars, or dangling from your helmet. Adjust sight lines easily with its rotating, clam shell joint. When you dismount, close it up to shield the glass, and wear the breathable one-size-fits-all band as a light, sporty accessory. Now avid cyclists can focus more on the road ahead, and their necks will thank them for it.

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Buy on www.amazon.com
$25 - $75