Okay so if you use prefolds, and pin them closed you can cover them with a wool soaker, and they won't leak???

Do i have this right?
That instead of using a pul/cover you can use wool, or do you still have to use a cover and then the wool,....
I'm sorry about my 5thousand questions, I just want to understand what i'm going to be doing..
Thank AGAIN!! lol
~ Nedene