I bought these because I wanted a pair of sunglasses that would fit over my prescription glasses but not make me look dorky. I bought these instead of clip-on sunglasses because I mow lawns for a grounds company, and was hoping that these glasses would keep stuff out of my eyes and from scratching my prescription glasses. They do, mostly. because of the shape of the frame of the Cocoons and the shape of my face, I occasionally (about 5 times a day) get some flying grass/rocks/trimmer line between the lower right and left corner of the Cocoons and my face. Not a big deal, because before I bought these, I used an old pair of glasses (different prescription, thus poorer vision) that was scratched and pitted. Now, I can wear my daily glasses, and don't worry about scratching them up. In addition, these make trimming along bright white objects (concrete driveways, white siding, etc.) much easier, as I am not squinting. I like the Flex-2Fit temples- they can be adjusted to make the fit tighter or looser. I usually straighten the temples and bend them in toward my headThey are also great for driving as they cut the sun's glare, etc.<br />Overall, these were a great investment. I hope they last. Just beware, these may not fit snugly against the front of your face like some sunglasses would.