For those "super soakers" it's important to have adequate protection without too much bulk. Trim, absorbent materials like hemp fit the bill. Hemp does not absorb as quickly as cotton or microfiber, so for very heavy streams, it's a good idea to have a layer on top of hemp for faster absorption. Inserts like the LoopyDo provide a great combination of quickness and lasting power!
In some cases, a doubler may be just the thing to add to your diaper. It will add more absorbency without adding a lot of bulk.