The phrase "white helmet" usually refers to the protective headgear worn by people working in dangerous situations like firefighters or rescue workers.
Sentences with «white helmet»
Though I guess white helmets would look kind of silly with black jerseys. (sbnation.com)
Three players show up on the field for practice with white helmets instead of orange — «Did you not get the memo?» (sbnation.com)
Tags 4.1 miles brillo box close ties documentary short extremis frame 394 joe's violin oscars the mute's house the other side of home watani: my homeland white helmets (awardswatch.com)