|Photo from www.econobum.com|
The pre-folds are very thick and absorbent. They have pre sewn lines to show you were to fold them and can be folded in different directions depending on the size you need. You can use them with pins or Snappi's or just lay them flat in the cover like an insert. I still prefer the Flip inserts and use them more often than the pre-folds. The inserts are easier since there is no folding involved, plus they are trimmer and more absorbent.
You can buy a kit from Econobum that claims it will get you from birth to potty training for only $100. If you have the money upfront that would be a great deal.