ネイティブが教える英会話のジェムスクール☆Teachers☆

I was driving recently and I saw a man in a strange helmet. The man in the green helmet has a normal helmet but the white helmet has an odd shape. It's very polygonal. I know that the job of the helmet is, of course, to protect the head. I also know that one of the functions of the helmet is to deflect an impact in such a way to reduce the force of the impact. The polygonal helmet seems that it would absorb more force than its more rounded counterpart. I thought it very strange.