Also known as: ハードハット, 안전모, hard_hat, 安全帽
A Helmet worn around Construction Sites commonly made of heavy reinforced plastic. Japanese helmets are commonly depicted yellow with a green stripe and a +.
Commonly worn by Met (Mega Man)s in the Mega Man (Series) series and Engineer (Tf2) of Team Fortress 2.
If it has a Headlamp, it's a Mining Helmet.