It's just hair with a short terminal length. I suppose it's what couldn't decide if it wanted to be fine baby hair or tough grown up hair and ended up somewhere inbetween. I have the same but mine is about two inches long. It's also curlier than my hair and likes to stick up. I've got to accept that a bit or hairsray applied from my palms or some aloe gel is needed if I must look sleek.
I expect it's finer than the rest of your hair too. Most people's is.
Bookmarks