The iron and copper helmet was probably used for ceremonies.

VOA: special.2010.08.04

But I wear helmet and the stuff, so...

不过我带着头盔，装备齐全，所以……

喜欢自行车 - SpeakingMax英语口语达人

The top is this helmet that comes up over his face and covers it pretty totally.

头部戴有头盔,覆盖面部,能完全遮住脸

耶鲁公开课 - 古希腊历史简介课程节选

Anyway, you have to be careful with your motorcycle and always wear your helmet.

不管怎么说，你都要小心骑摩托车，记得一定要带着头盔。

I didn't 实战 - SpeakingMax英语口语达人