Cycleaware Reflex.
I used to use Take-A-Look but then I wiped out on a patch of sand. The gouges that the Take-A-Look made on my face took 18 stitches to close.
The reflex is all gumby wire and plastic around the mirror, much safer. After the accident and I thought about it, it's actually kind of terrifying that the Take-A-Look has very stiff wire and brass tubing right up by your face and eye.
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Work: the 8 hours that separates bike rides.