I actually have two pairs of these due to the loss of one pair in the snow last year, that I miraculously recovered in the spring. I don't even feel bad for having two sets I like them that much (plus I tend to lose shades). As everyone says, you can't beat these glasses and the interlock system is hands down the best unless you have sunglasses that are half jackets. Since most people have already commented on the greatness of these shades, I want to stress that if you are at all wavering over any Smith glasses, their customer service is top notch and so far (for me) has only ever been rivaled by Rudy Project. Also if you break your glasses and they don't carry your style anymore, you will get a credit voucher for the retail price of the out dated pair towards a new set of glasses. Can't say enough good things about Smith. Even their gawdy glasses are awesome.