sentence: Some helmets are made from metal.
sentences_before: A 'helmet' is a hard or cushioned hat which is worn to protect a person's head. There are many different types of helmets.
sentences_after: Other helmets are made from plastic. Helmets often have fabric cushions inside and fabric straps to hold the helmet on a person's head.
concept_name: helmet
headings: Helmet
categories: Protective clothing