Got this when I upgraded my bike. Was very nervous getting a small based on measurement. Tried it at home and it was difficult to take off and put on initially. It is now 3 weeks and the helmet is awesome. Fits my head shape (round oval). Breaking in nicely getting easier to remove and put on. Many options for customizing air flow. Tried the pin lock and then removed it. Not a big fan of visor lock mechanism. Overall a great helmet. Looking forward to a few years with it.