The Blenders "Stone Breaker" sun glasses are very durable! I am pretty tough on sun glasses. My previous purchased sunglasses normally would last me around 6 months or less. When not in use, I have placed them on my head, hung them on my collar, dropped into my backpack without a case, left them inside the hot car during the summer months, slept with them in my pocket while camping NOTE: I'm a very restless sleeper and dropped them numerous times on pavement. I have left them outside on the patio furniture, in the spa, on the barbecue or in my vegetable garden. I have often found them in the dirt, sand, mud and snow. I'm sure you can relate to some of those "above mentioned" careless behaviors with sun glasses. Anyway, I have had the Blenders Stone Breakers for more than three years and they are still doing the job! They are receiving the same treatment as I gave my previous sunglasses. That's right, I haven't change my reckless behaviors. They are just plain amazing!!! I really love all of the great styles and colors too! I like them so much that I have purchased Blenders for stocking stuffers during the Christmas season for my very active grown-up kids who mountain bike, ride dirt bikes, paddle board, rock climb, run marathons and hike the Fourteeners! I do recommend Blenders for every adventure you encounter!