Purchased the AVIP color way in large with a 59cm measured head circumference and it seams to fit really well I don't think I would have fit in a medium. I have read a lot of POC helmet reviews about the ear straps being too short so I'm not sure if this is a new design but the straps can be adjusted so I had no issues with the plastic touching the bottom of my ears. I like the helmet, seems on par with my giro syntax helmet.
