Hi everyone, I am currently a sophomore at the University of Pittsburgh. Since I am a college student I have VERY little money to spend on anything besides school. However, sunglasses are something I MUST have. My eyes are very sensitive to the sun and polarization is a must also. I did have a pair of white Gascan's with polarized grey iridium lenses but lost them (I have no idea how, but I'm an idiot). I think I might start my collection again by getting a pair of gloss black Gascan's, but the thing that bothered me about my white one's was that after a while the sides of my head would hurt from the pressure they exerted (these were regulars, not S's). Another option would be the flak or half jacket 2.0 because I need a pair of sunglasses to wear outside for physical activity. What are the main differences between the two? Also, what other sunglasses would be a good value for a college student? Any advice/opinions would be appreciated, thank you.