I have never bought sunglasses before without trying them on but I decided to give IALUKU Cycling Sunglasses a chance and they fit my head well and were polarized. Also found that there are 4 variations of these - 1) brown, 2) mirror style lenses, 3) clear anti fog, 4) yellow lenses which arent tinted at all... all are polarized which is a must for any shades. I really like the way these glasses fit and feel. They are light weight and I am very happy with them.