I am very particular about my sunglass choices and so I don't make this recommendation lightly. ROKA makes seriously awesome cycling glasses (and other types of sunglasses). Their frame material is durable and flexible. The glasses are extremely comfortable, and their lens replacement technology is super easy-to-use. Not to mention they have awesome customization abilities for the frames and lenses on their website so you can make a pair of sunglasses that are uniquely yours. I am currently rocking a pair from the CP series on my rides and have a few lens replacements for various conditions.