Looking at options on new riding glasses with interchangeable lenses. I have a small head and a lot of specs drop off. Which Oakleys are suited to smaller heads?

Jawbones are very good and feel snug.

Generally most Oakley glasses fit well. I have the Half Jackets which are great. Much cheaper than Jawbones if you don't fancy paying that. Also, Radars and Flak Jackets. Radars are used by loads of the World Cup guys (Mathias Fluckiger is a small guy and uses them).

They used to do "condensed cranial geometry" ie for smaller heads, which included the half jackets, 5's, flak jackets and a few others. I have both half jackets and flak jackets, which fit great. I tried the radars and found them to be too wide.

M-frames with hybrid-S lenses.
MrsF has a small head/face and they fit her fine.

M-frames are huge on me – would be impossible to ride in them as they'd fall off, half jackets are a much better choice for a smaller face i think