hard hat
US /ˈhɑːrd hæt/
UK /ˈhɑːrd hæt/

1.
Schutzhelm, Bauhelm
a helmet made of hard material, worn by workers to protect their heads from falling objects or blows
:
•
All construction workers must wear a hard hat on site.
Alle Bauarbeiter müssen auf der Baustelle einen Schutzhelm tragen.
•
He put on his hard hat before entering the mine.
Er setzte seinen Schutzhelm auf, bevor er die Mine betrat.