this melon definitely approves of the R1. XS should work, I can get my head in one, I just HATE the look on me. XX is alright on me.R1 is the largest frame for sure. Big Melon approved by @QLR1. XS and XX are probably the next biggest. Given the fact that you can change out the temple shox to accommodate different sizes and shapes of skulls, it would just be a matter of preference as to how tight you want them to fit. Only difference with XS is that the earstems are a little shorter than eithe of the others and some do not like where they sit/squeeze.
Sent from Q's Note5