What is your flow like?
Watery gushes.
Watery gushes need some textured material to grab and absorb them so that they don't spread to the edges of the pad's surface. Flannel and terry do the job well. PUL for waterproofing or wool or synthetic fleece for a water resistant backing can help distribute flow inside the pad so that you can wear it longer between changes. The heavier your flow is and the greater the the gushes, the more area coverage you'll need.
Thick or Clotty.
If your flow is mostly thick or clotty, you'll want to avoid silk and flat cotton topped pads. Flat cotton tops feel wet and silk tops develop a crust when thicker flow doesn't permeate.
The good news is that you can almost certainly get by without any waterproofing.
My flow varies a lot.
Flannel is a good all-purpose topping when you don't know what you're going to get. You may want to err on the side of terry if you're worried about any surprise gushing.



