These spy glasses look like an ordinary pair of sun glasses. Yet they have a unique feature...you can see behind you. The lenses on these spy glasses have a special coating that allows you to look straight ahead and still see what is going on behind you. Stylish and great for walking and biking. You won't need to turn your head to see if a car is coming. It'll be like you have a rear view mirror with you. Have you ever thought you were being followed? Now, no one can sneak up behind you. These spy sun glasses make a great novelty gift!