We ordered our first helmet last summer after he got his Go Cart. It was way too small. Then this year I did an actual measurement of his giant dome and we got this helmet. He picked it out and when it arrived he immediately put it on ... AND would not take it off for about 2 hours. This kid played with it on, tried to eat with it on and had me take pics for everyone to see. This one fits perfect and he loves the look and feel.