hard hat
protection helmet

The only thing was, before he came back here, he'd really have to get a hard hat.

Just watch your step and keep the hard hats on.

They each saw this guy walking around with a hard hat.

"You got to have your hard hat every week in this league."

I was wearing a hard hat with a light on it, turned off at present.

He also wore what was left of a hard hat.

"He's inside but you still can't run around without a hard hat."

Hey, you can't come in here without a hard hat!

Following the young woman with his eyes was the inevitable hard hat.

Then he put on a hard hat and set to work right beside the construction workers.