I have an extra-large head.  I know that sounds weird, but hats never fit me -- they just sit on top of my head, not over my head.  This wig fit, which was a huge blessing.  However, the wig itself was really shoddy.  the front piece, which would be over my forehead, was inside out.  The hair was on the inside of the wig and the looped/tied end of the strands were showing to the world.  The wig sheds like crazy.  Please understand these comments all relate to when I took the wig out of the package for the first time.  When I did put it on, people were mesmerized by how nasty the wig looked, not by how great my costume was.  So if you need a wig and you have a big head, as long as you don't care about quality, this is the wig for you.