A Closure Hair is basically a small hairpiece. It is usually used with hair weave installation and allows you to wear a full unit/full weave without leaving much, if any of your hair out. You can part your hair in pretty much any way you like, so when it is worn properly it will be a great protective, natural-looking style. Closure Hair 100% human hair virgin hair comes from one single donor that means it is not processed or chemically treated in any way. Virgin hair can be curled, straightened and dyed to any color.