Wearing crash helmets is mandatory for motorcyclists.

The knights wore close helmets for protection in battle.

I saw two washbasin helmets at the store.

The football team wore purple helmets during the game.

The pilots wore flying helmets for protection.

The soldiers wore Corinthian helmets to protect their heads in battle.

The soldiers wore kettle helmets for protection.

He wore crash-helmets while riding his motorcycle.

The astronauts wore space helmets during their mission.

I saw two coal scuttle helmets at the antique store.