better off to try them on.... helmets are made to fit different heads
When I went helmet searching for my buell I tried on Bieffe, Bell & several other ones. A HJC helmet fit me the best, the more expensive helmets ($600-800) simply didn't work for me. My HJC was $450
My head is more round or something like that which is why several of the other helmets didn't work.
I don't like the idea of wasting people's time at a store then ordering elsewhere. IF you are going to go to a store & have a employee take their time to help you, buy from them since they are usually on comission.