The truth is, these are excellent sunglasses. Really robust, really comfortable and feel very, very high quality.
I brought 3 pairs with me on holiday including Prada, and Givenchy - I love those glasses.
To be completely honest I wore your sunglasses the most and honestly, they are made to a far, far better standard.
If these glasses had a designer brand on the side you'd have no trouble believing they were Bottegas or similar from the build weight and feel.
I would go as far to say they...