When cycling, it's always good to know what's behind you, and the Zefal Z-Eye Helmet Mirror allows you to do just that. With a universal helmet mount and a fully adjustable lens, you'll ride with more confidence, and more safely. That translates into more fun. Nearly unbreakable and still under 20 grams, you won't even know it's on. What's behind you matters, and the Zefal Z-Eye mirror lets you know.