Prada sunglasses A/W 2011

Having a flick through at a fashion magazine today I came across this picture.

Obviously I am guessing it is from the Prada catwalk but fashion really baffles me sometimes. What is the model wearing?! Are they supposed to be a pair of sunglasses or are they supposed to be skiing goggles? If they are in fact a pair of sunglasses then I wonder how many people will be following this trend? Some people are such slaves to fashion, especially designer brands!