As an owner of 6 or 7 pair of Polar Optics / Solar Shield sunglasses, I've experienced most every problem this brand is capable of having. The lens quality is excellent, but earpieces are very fragile. So why continue to pay 20 bucks each for so many pair? Well, until about two years ago, warranty was great. A simple email was all it took to get an exchange pair, no matter what the problem. Then the emails went unanswered -- maybe they changed ownership, or fired the "good" warranty lady. So I tried the new customer service contact info. Oh sure, no problem, just send them in prepaid -- with proof of purchase -- oh yeah and be sure to include $5 or so for "handling". The old lifetime guarantee is now a year -- and for sure, the earpieces will be shot before the warranty expires.Solar Shield Polarized Glasses