This rearview sunglasses will save your life. It gives you the power to see what’s going on at the back of you, allowing you to take notice and react to the Russian guy who is sneaking up on you to shoot a poison dart, kidnap you, bring you back to Russia and feed you to his dogs.
The secret of this sunglasses is that there is a coating towards the edge on the inner part of the lens that works as a mirror. So you can see what’s going on at the back of you by looking at the coating. And the frame is purposely made wide so that you can see the back of you no matter how big your head is.