Two pairs first was a crowdfunding campaign, second because they are so amazing. Polarized lense so good crisp vision. I am constantly folding and unfolding hasn't broken, very well made. I had one issue one of the nose pads fell off, the company immediately sent me two more. You need a good glass cleaner because you are always touching the lense because of the folding and unfolding...I give them the highest rating possible and how great is it to slip them in a case and put it in your pocket instead of hanging from your shirt etc...Highly recommend and no I don't work for the company