I have Costa Zane sunglasses and they fit me perfectly. I've looked at the others but I have to return them because I just don't want the thought to stay in the back of my mind, especially when I'm driving. It looks and looks stupid. This is just my opinion and from my experience. I'm really happy with it and as for the length I think it's enough but I think some reviews say it goes under the back of your shirt but I liked it. It doesn't matter to me if it's under the shirt or outside the shirt as long as it doesn't stick out and interfere with your driving ability or experience. I also heard some reviewers say they lost the rubber retainer that attached to the bottom of the cable. I think I found a great solution to this problem: I attached a zip tie to the end of the cord to keep the holder from slipping out again. I wish I could think about that before I lose my first one.
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