The High end helmets like the Arai Corsair RX-7, Shoei X-12, Bell Star, etc, are designed for racing. They are noisy and light weight; designed to flow maximum amount of air and keep you alive in a high speed impact. At low speeds they may end up giving you a bigger headache b/c they are stiffer than the cheap plastic composite shell helmets; but they weren't designed to be crashed at 25 mph, they were designed to crash at 125+ mph. So get the right helmet for what you're doing. Are you just tooling around town on your ninja 250? then don't get an X-12; do you enjoy pushing your bike to the limit on the track every other Sunday? then don't settle for a ZXR. And for heavens sake make sure the helmet fits; no, you don't wear an XL.