ViewPoint is an adjustable rear view mirror for a variety of sports. The mirror sticks to the inside of your sunglasses where it's invisible to others. Its tiny 3/8-inch diameter mirror mounts with a ball and socket arrangement so you can use it on a variety of eyewear designs and still find the best viewing angle.It's simple to use. The base of the mirror comes with an adhesive attached to it. To install it, you simply peel the protective paper off the adhesive and place ViewPoint on the inside of your eyewear lens.While cyclists and runners mainly use ViewPoint to spot competition and traffic, they're also using it after they're done with their race or workout. It's like having eyes in the back of your head! ViewPoint is a great source of security and fun!