"Asian Fit" tends to turn a lot of prospective wearers away, simply because it's a bit misleading. This delineation is simply reserved for certain Oakley frames with a slightly narrower and deeper nose bridge. They certainly fit a good many Asian facial profiles, but other facial types are not a complete exclusion. To really dial in the right fit, Oakley also includes a second pair of specially-sized nose pads with the AF Split Jackets which allow the frame to sit a little bit higher on your face. If you struggle with finding sunglasses that don't perch comfortably on your nose and bump the tops of your cheeks, the Asian Fit might be for you. Frame width is not part of the equation here; if you have a wider head, they'll still fit, but if you have a wider or 'taller' nose, you'll probably want the standard Split Jacket. Fit aside, the Split Jacket is an excellent medium-coverage sport frame that lacks some of the overt aggression of the Jawbone, while still delivering top-tier performance with an intuitive lens interchange system. Note that all Split Jacket lenses will fit any model of Split Jacket frame - Asian Fit, or otherwise.
* I have a medium-large sized head and prefer the coverage of the Jawbone, but this Split Jacket still fits fine - it's just a matter of getting the nose bomb fit just right
* changing out the nose bombs on the Split Jackets is easy, but there is a specific technique to doing it without damaging the mounts:
1) unlock the nose piece to open the frame's "jaw" and remove the lens
2) take notice of the tiny "claw" opening on the nose piece (the part that attaches to the alloy bar in the frame), grip the frame firmly (you might find it easier to close the jaw first), and pull the nose piece directly downward - opposite the attachment point and away from the frame