WHY does Arai maintain shell thickness all the way to the bottom?
Many helmet makers reduce shell material at the bottom. (The safety standard organizations don't test there.) Arai maintains shell thickness to the very edge - and then strengthens it! - because we don't think it's a good place to try to save a few dollars or a little weight. Strengthening the bottom also helps to significantly lower the helmet's center of gravity, contributing to a better overall balance, making an Arai rest easier on your head.