I purchased these on April 6, 2015.  It is August 25, 2015 and the spring hinge has already broken at the arm.  I did not sit on them or force them in any way.  I was simply pitting them on my head when they snapped. I have contacted the seller, Ten Element, to see if they will replace them.  If they do I will upgrade this rating.  Otherwise $158 for glasses that broke in less than 5 months is a ridiculous amount of money and I would not do business with them again.