Wondering what’s going on behind your back? — These nifty 50s-60s style sunglasses will let you see what’s going on in front of you while also seeing what’s going on behind you. Perfect for paranoid types or anyone who hates having people (or animals) coming up behind them. — Is that guy at the desk behind you making rude faces behind your back? You’ll know soon enough with these super spy shades.The key is the mirrors along the outside of the lenses that let you see behind you. — Black plastic frames. Lenses are rated UV400 and meet ANSI Z80.3 general purpose UV requirements.