All that being said, material or price does not always correspond to protection level. A few years ago, many Arai helmets were failing the Snell tests based on unacceptable performance (the helmets were supposed to be snell rated, but they were transmitting way to much force into the dummy head). I haven't looked at the tables in a few years, but I was disgusted that some $1000 helmets were failing and some $200 helmets were passing.