hard hat
tin hat
safety hat

What is he going to do - stand in the middle of the street with a tin hat on his head?

Yet the dent was on the back of my tin hat.

Puts me much in mind of the last war, when they went for a year a half with no tin hats.

I took off my tin hat to feel the sun on my face.

A young waiter came into the room, carrying a torch and with a tin hat in his hand.

For that matter, a tin hat was small protection.

After a year of war the regular army was still short of 300,000 tin hats.

When bombs and bullets flew, a tin hat seemed small protection.

When the guys from Big Blue were through he'd be glad he was wearing a tin hat.

I didn't recognise you in your tin hat,' she said.