The concept of the hides® retainer is to provide the most versitile and convenient eyeglass retainer with the ability to hold your glasses, cover and protect them when being stored, and clean the lenses. After hides® are attached to your eyeglass temples, you can adjust the fit by moving the tube of the retainer up and down the temples of your glasses.  After taking your glasses off, flip the case section around and to the front of your glasses, then manipulate the case so that it covers the lenses.  When done correctly the case will stay on until removed.

Checkout the awesome video below: