My lenses fit perfect into the frame, size is perfect on my head. This is my second pair of the Tin cup frames. First ones I broke, My bad. I really like my glasses. Very good looking frames! And NO they do not come off your head to easy, whoever says that probably did not buy the right size. or they didnt try on some straight arm frames before. They do feel different than frames that go around your ear, but I will never go back to frames that go behind my ear. There is no carbon fiber on the arms. 'There is replaceable rubber tubes that slip on the arms for comfort to your ears. I really dont like when people leave incorrect reviews. You wont be disappointed with these.I like that they look awesome and fit greatOakley frames are the ,best, my last frames last over 7 yr , they seem to be new to me very happy with priceIt was definitely easier to purchase these on Amazon than trying to buy them from Oakley (think fast shipping). The frames themselves look great. However, due to the arms being quite straight, they don't stay on the face very well. I would not buy this kind of frames again.Made in china, meaning it didn't last long before the glue came off... Loved the glasses, but they bended real easy and the glue came off within 2 months... =/I was expecting a brand new pair of eyeglasses. I received a bent pair of Oakley glasses, there appeared to be dandruff on the case and carrying cloth (which I have NEVER HAD on any other Oakley products), and the box it came in looked a bit worn out. The attached photos also include abrasions I found on the frames.GreatNICE FRAMES, GREAT PRICE.Yes it's a genuine product and trust me guys u won't regret if u purchase this frame.Slightly smaller than the dimensions given in the description ..Magnificas gafas. muy contento con la compra. un precio muy ajustado al precio real en cualquier ópticaOriginal product, came nicely packed.Montatura leggera e di stile. Ottimo acquisto!