A hemparoo is made by Baby Kicks I think. I purchased mine from a site I got my Fuzzi Bunz at. It is what you stuff the dipe with. This is made out of hemp and is really trim. Much trimmer than a CPF (prefold). They are about 5.00 each, but to me very worth it for the trimness. I can't stand bulky diapers.
When I started CD'ing I startef with prefolds and covers. That lasted about a week or two, I hated it. Sold everything on Ebay and bought tons of FB. Liked those, till I tried Apron Strings. LOVED those, sold half my FB and bought a bunch of AS.
When Abby moves into larges, I plan on getting almost all AS with a few FB for night time and long car trips.
Well, that was a longggg answer to a very simple question!
I would post a link to a hemparoo, but I am really not sure of the rules re that.