After many years of wearing contact lenses It's got to the point that I can't wear them anymore without constant irritation. Their always itchy,dry slip out always something. I don't mind wearing glasses except when I have a helmet on, It sucks they go up or down don't fit just a hassle. Anyway got these Nike Flexon frames with my perscription lenses and its like they were made for helmet use. The temples form fit to your head they don't hook over the ear and fit and feel perfect inside my helmet. There are a few other frame options and colors one pair of the frames can be tied in a knot thats how flexible they are. With prescription lenses I paid just about what people spend on oakleys.