Alright, I just did a quick search but nothing really relevant came up. I just got my first helmet - an HJC CL15, and after about half an hour of wearing it I start to get a big headache at the back/top of my head. I take it this isn't normal; however when I tried helmets on the small was...well, too small, and the large was a bit too loose.
Am I just not used to wearing a helmet yet? Does it have to pack in a bit? When I took my riding course I didn't have this problem. I'm assuming I can't take a helmet back to where I bought it, and trade for the next size up.
Any input is appreciated, but it seems like this might be a bit of a dumb question.