The Top Secret Spy Glasses are really cool and they work great to secretly see behind you.  From the front they look like stylish dark sunglasses but they hold a great secret. When you are wearing the spy glasses you are able to see behind you because the glasses have built in mirrors on the inside outer edge of the lenses.  The way they are designed you can easily see where you are going in front you and you can also see behind you with these cool rear view glasses.  Includes 12 pairs.