comforter fill power and level

I am trying to buy a comforter for fall use (right now, not too thick, not too thin), and totally confused about "fill power', and "fill level"? could some expert here explain this to me?

Is this one from kohls good? Thank you very much for your inputs!

http://www.kohls.com/kohlsStore/bedandbath/comforter*****edspreads/comforters/PRD~c15652/Home+Classics+Warmer+DownAlternative+Comforter.jsp