Hi all. I'm after a couple youth sized helmets for my 5 and 7 year old. Was thinking of doing something open faced with goggles. They won't be riding in the extreme cold and this way can use them in the summer for the go carts, etc. Has anybody had any luck purchasing these online? Can a head measurement get accurate sizing? I have a motorsports store about an hour from home that I may just take the kids to but thought I'd check some online options first. thx.